When purchased, the buyer received a build that supported two email addresses, a decryptor and a unique RSA key pair. It should be noted that absent from this list is sys (system drivers), ocx (OLE control extension) and other executable file types. The GRIM SPIDER actor name has been deprecated. Thus, it is highly likely that Ryuk pre-generates the RSA key pairs for each victim. * f:\*.set f:\*.win f:\*.dsk, del /s /f /q g:\*.VHD g:\*.bac g:\*.bak g:\*.wbcat g:\*.bkf g:\Backup*. One such error states: “Snapshots were found, but they were outside of your allowed context. Patient care continues to be delivered safely and effectively. Of these three new features, only the file extension is still present in an executable compiled on Dec. 20, 2018. The email addresses usually contain one address at protonmail.com and another address at tutanota.com. Searching earlier events, we noticed a posting from August 2017 in an underground forum in which a Russian-speaking actor offered the malware kit Hermes 2.1 ransomware: What if the actor who attacked the Taiwanese bank simply bought a copy of Hermes and added it to the campaign to cause the distraction? The Ryuk ransom note is written to a file named, . In the race to determine who is behind an attack, research facts (the What and How questions) are often put aside to focus on attribution (the Who question). This refers to functionality implemented in Hermes to check the host to ensure that it is not running on a Russian, Ukrainian, or Belarusian system. The batch file kill.bat contains commands for stopping services, disabling services and killing processes. net stop avpsus /y Ryuk ransom note Unfortunately, with ransomware attack, there is also a high chance of the attackers stealing patient and employee data which will further increase the damage. We used the term pseudo-ransomware to describe this attack.

Senior analyst Ryan Sherstobitoff contributed to this report.

The footer only contains the marker HERMES but not the exported AES key. The contents of the batch file are shown below in Figure 2. vssadmin resize shadowstorage /for=c: /on=c: /maxsize=401MB, vssadmin resize shadowstorage /for=c: /on=c: /maxsize=unbounded, vssadmin resize shadowstorage /for=d: /on=d: /maxsize=401MB, vssadmin resize shadowstorage /for=d: /on=d: /maxsize=unbounded, vssadmin resize shadowstorage /for=e: /on=e: /maxsize=401MB, vssadmin resize shadowstorage /for=e: /on=e: /maxsize=unbounded, vssadmin resize shadowstorage /for=f: /on=f: /maxsize=401MB, vssadmin resize shadowstorage /for=f: /on=f: /maxsize=unbounded, vssadmin resize shadowstorage /for=g: /on=g: /maxsize=401MB, vssadmin resize shadowstorage /for=g: /on=g: /maxsize=unbounded, vssadmin resize shadowstorage /for=h: /on=h: /maxsize=401MB, vssadmin resize shadowstorage /for=h: /on=h: /maxsize=unbounded, del /s /f /q c:\*.VHD c:\*.bac c:\*.bak c:\*.wbcat c:\*.bkf c:\Backup*.

sc config SQLTELEMETRY$ECWDB2 start= disabled, CrowdStrike has observed another batch file, named. We often come across manga-inspired nicknames and avatars in underground forums. Early versions of Ryuk included the whitelisting of ini and lnk files, but these have been removed in recent builds.

If the time stamps are correct, the two executables (bitsran.exe and RSW7B37.tmp) were compiled within four hours and three minutes of each other. Unlike other families of ransomware, Ryuk does not contain process/service termination and anti-recovery functionality embedded in the executable. The new ransom note can be seen below. For Windows XP, an example folder path would be C:\Documents and Settings\Default User\, and for Window Vista or higher, the path would be C:\Users\Public. net stop McAfeeDLPAgentService /y From a call-flow perspective, we notice the similarities and evolution of the code: The Hermes 2.1 ransomware kit, renamed and redistributed as Ryuk. Ryuk Ransom Note Bearing Strong Resemblance to BitPaymer. According to reports coming from UHS' employees, UHS hospitals in the US including those from California, Florida, Texas, Arizona, and Washington D.C. are left without access to computer and phone systems. Example Hermes Footer in FEIB SWIFT Attack with Encrypted AES Key Missing. * c:\backup*.

This approach is similar to. The command arguments are for, the deletion of a file. With 52 known transactions spread across 37 BTC addresses (as of this writing), WIZARD SPIDER has made 705.80 BTC, which has a current value of $3.7 million (USD). This suggests that WIZARD SPIDER (like INDRIK SPIDER with BitPaymer) calculates the ransom amount based on the size and value of the victim organization. Why go to the trouble to build something, when the actor can just buy the perfect distraction in an underground forum?

Last week, BleepingComputer reported that a ransomware attack affecting a German hospital led to the death of a patient in a life-threatening condition after she was redirected to a more distant hospital. If a single executable is used for a single victim environment, then there are no repercussions if the private keys are leaked because it will only decrypt the damage from a single Ryuk executable.

files dlya raboty !! Hermes is commodity. The Ryuk payload executable written by the dropper is the Ryuk component that contains the core logic for encrypting files on the host. Anti-Recovery window.bat Commands. is the Hermes ransomware executable. The following command line was used to write to the Registry Run Key name svchos to  HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run with the value being the path to the Ryuk executable. The dropper’s goal is to propagate the Hermes executable within a network by creating scheduled tasks over SMB sessions using hard-coded credentials.

In recent months, Ryuk binaries have continued to deviate further and further from the original Hermes source code, with the threat actors adding and removing functionality often. While doing dynamic analysis, it was not uncommon to observe Ryuk attempting to encrypt files related to the Windows Bootloader (C:\Boot) or other critical files and folders. In October 2017, we investigated an attack on a Taiwanese bank. Keeping our eyes open for falsifying facts and constantly questioning our results are essential steps to avoid conformation bias. net stop NetBackup BMR MTFTP Service /y

Previously, to remain persistent on the host, Ryuk created a registry entry under the Run key using Windows cmd.exe shell. !.rar, which translates to “files for work.”  Based on these factors, there is considerably more evidence supporting the hypothesis that the WIZARD SPIDER threat actors are Russian speakers and not North Korean.

. section at the end of this blog. Table 1 contains samples that are possibly attributed to the compromise. * e:\backup*.

The files could have been uploaded by a victim in Russia, but the time frame between the functionality being removed from Ryuk binaries and included in kill.bat was very short. After some time, Emotet will also install TrickBot, which ultimately opens a reverse shell to the Ryuk operators after harvesting sensitive information from compromised networks. The actor name GRIM SPIDER was introduced into CrowdStrike’s nomenclature in September 2018 for the group that operates the Ryuk ransomware as a distinct sub-group of the WIZARD SPIDER criminal enterprise. Finally, the AES key for each file is encrypted with the victim’s RSA public key, then stored at the end of the file. If changing a name and ransom note are part of these tuning options, then it is likely that Ryuk is an altered version Hermes 2.1. If the machine has the value 0419 (Russian), 0422 (Ukrainian) or 0423 (Belarusian), it call ExitProcess to stop executing.

When purchased, the buyer received a build that supported two email addresses, a decryptor and a unique RSA key pair. "After 1min or so of this the computers logged out and shutdown. * h:\backup*. section, Ryuk uses a combination of symmetric (AES) and asymmetric (RSA) encryption to encrypt files. * d:\backup*. could aid in recovering the credentials needed to compromise environments — the SOCKS module in particular has been observed tunneling PowerShell Empire traffic to perform reconnaissance and. Ryuk was tailored to target enterprise environments and some of the modifications include removing anti-analysis checks. Instead, Ryuk has two public RSA keys embedded in the executable, and what was previously the victim’s RSA private key is encrypted and embedded in the executable. Note that since the del command does not securely delete a file (i.e., overwrite a file before deletion), some level of file recovery may be possible using forensic tools. By ensuring that the process is not running under NT AUTHORITY, the developers are assuming the process is not running under another account and therefore can be written to. To check the host language, it queries the registry key, . As of this writing, it remains unclear if WIZARD SPIDER is copying the TTPs (tactics, techniques and procedures) and ransom notes of BitPaymer, or whether the groups may share information with each other. Figure 6. Example Hermes Footer with Encrypted AES Key. To check the host language, it queries the registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Nls\Language\ and the value InstallLanguage. del /s /f /q h:\*.VHD h:\*.bac h:\*.bak h:\*.wbcat h:\*.bkf h:\Backup*. The dropper checks whether the host is 32-bit or 64-bit by calling IsWow64Process and writes one of two embedded payload executables corresponding to the host’s architecture. The folder path is created by calling, and then inserting a null byte at the fourth character of the path. vssadmin resize shadowstorage /for=d: /on=d: /maxsize=401MB All of the executables except for Hermes were compiled with Visual Studio 10, with a linker of Visual Studio 10. RYK encrypts data using a cryptography algorithm, thereby rendering files stored on a computer unusable. sc config SQLTELEMETRY start= disabled While supporting an incident response investigation involving Ryuk, Falcon Intelligence noticed files related to the investigation being uploaded to a file-scanning website from an IP address in Moscow, Russia. One file was named. Recovery of Ryuk droppers are rare, due to the Ryuk executable payload deleting the dropper when executed.

In March 2018, Hermes was observed targeting users in South Korea via the GreenFlash Sundown exploit kit. According to Kremez, their Andariel intelligence platform detected both the Emotet and TrickBot Trojans affecting UHS Inc. throughout 2020, and more recently, in September 2020. Falcon Intelligence has been monitoring the geo-based download activity from Emotet and, during 2018, MUMMY SPIDER has been an avid supporter of WIZARD SPIDER, predominantly distributing TrickBot to Emotet victims in the U.K., the U.S., and Canada. * d:\*.set d:\*.win d:\*.dsk CrowdStrike Intelligence will now solely use the actor name WIZARD SPIDER in association with TrickBot and Ryuk. Artifacts do not all appear at once; a new piece of evidence unearthed years after an attack can shine a different light on an investigation and introduce new challenges to current assumptions. .

When purchased, the buyer received a build that supported two email addresses, a decryptor and a unique RSA key pair. It should be noted that absent from this list is sys (system drivers), ocx (OLE control extension) and other executable file types. The GRIM SPIDER actor name has been deprecated. Thus, it is highly likely that Ryuk pre-generates the RSA key pairs for each victim. * f:\*.set f:\*.win f:\*.dsk, del /s /f /q g:\*.VHD g:\*.bac g:\*.bak g:\*.wbcat g:\*.bkf g:\Backup*. One such error states: “Snapshots were found, but they were outside of your allowed context. Patient care continues to be delivered safely and effectively. Of these three new features, only the file extension is still present in an executable compiled on Dec. 20, 2018. The email addresses usually contain one address at protonmail.com and another address at tutanota.com. Searching earlier events, we noticed a posting from August 2017 in an underground forum in which a Russian-speaking actor offered the malware kit Hermes 2.1 ransomware: What if the actor who attacked the Taiwanese bank simply bought a copy of Hermes and added it to the campaign to cause the distraction? The Ryuk ransom note is written to a file named, . In the race to determine who is behind an attack, research facts (the What and How questions) are often put aside to focus on attribution (the Who question). This refers to functionality implemented in Hermes to check the host to ensure that it is not running on a Russian, Ukrainian, or Belarusian system. The batch file kill.bat contains commands for stopping services, disabling services and killing processes. net stop avpsus /y Ryuk ransom note Unfortunately, with ransomware attack, there is also a high chance of the attackers stealing patient and employee data which will further increase the damage. We used the term pseudo-ransomware to describe this attack.

Senior analyst Ryan Sherstobitoff contributed to this report.

The footer only contains the marker HERMES but not the exported AES key. The contents of the batch file are shown below in Figure 2. vssadmin resize shadowstorage /for=c: /on=c: /maxsize=401MB, vssadmin resize shadowstorage /for=c: /on=c: /maxsize=unbounded, vssadmin resize shadowstorage /for=d: /on=d: /maxsize=401MB, vssadmin resize shadowstorage /for=d: /on=d: /maxsize=unbounded, vssadmin resize shadowstorage /for=e: /on=e: /maxsize=401MB, vssadmin resize shadowstorage /for=e: /on=e: /maxsize=unbounded, vssadmin resize shadowstorage /for=f: /on=f: /maxsize=401MB, vssadmin resize shadowstorage /for=f: /on=f: /maxsize=unbounded, vssadmin resize shadowstorage /for=g: /on=g: /maxsize=401MB, vssadmin resize shadowstorage /for=g: /on=g: /maxsize=unbounded, vssadmin resize shadowstorage /for=h: /on=h: /maxsize=401MB, vssadmin resize shadowstorage /for=h: /on=h: /maxsize=unbounded, del /s /f /q c:\*.VHD c:\*.bac c:\*.bak c:\*.wbcat c:\*.bkf c:\Backup*.

sc config SQLTELEMETRY$ECWDB2 start= disabled, CrowdStrike has observed another batch file, named. We often come across manga-inspired nicknames and avatars in underground forums. Early versions of Ryuk included the whitelisting of ini and lnk files, but these have been removed in recent builds.

If the time stamps are correct, the two executables (bitsran.exe and RSW7B37.tmp) were compiled within four hours and three minutes of each other. Unlike other families of ransomware, Ryuk does not contain process/service termination and anti-recovery functionality embedded in the executable. The new ransom note can be seen below. For Windows XP, an example folder path would be C:\Documents and Settings\Default User\, and for Window Vista or higher, the path would be C:\Users\Public. net stop McAfeeDLPAgentService /y From a call-flow perspective, we notice the similarities and evolution of the code: The Hermes 2.1 ransomware kit, renamed and redistributed as Ryuk. Ryuk Ransom Note Bearing Strong Resemblance to BitPaymer. According to reports coming from UHS' employees, UHS hospitals in the US including those from California, Florida, Texas, Arizona, and Washington D.C. are left without access to computer and phone systems. Example Hermes Footer in FEIB SWIFT Attack with Encrypted AES Key Missing. * c:\backup*.

This approach is similar to. The command arguments are for, the deletion of a file. With 52 known transactions spread across 37 BTC addresses (as of this writing), WIZARD SPIDER has made 705.80 BTC, which has a current value of $3.7 million (USD). This suggests that WIZARD SPIDER (like INDRIK SPIDER with BitPaymer) calculates the ransom amount based on the size and value of the victim organization. Why go to the trouble to build something, when the actor can just buy the perfect distraction in an underground forum?

Last week, BleepingComputer reported that a ransomware attack affecting a German hospital led to the death of a patient in a life-threatening condition after she was redirected to a more distant hospital. If a single executable is used for a single victim environment, then there are no repercussions if the private keys are leaked because it will only decrypt the damage from a single Ryuk executable.

files dlya raboty !! Hermes is commodity. The Ryuk payload executable written by the dropper is the Ryuk component that contains the core logic for encrypting files on the host. Anti-Recovery window.bat Commands. is the Hermes ransomware executable. The following command line was used to write to the Registry Run Key name svchos to  HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run with the value being the path to the Ryuk executable. The dropper’s goal is to propagate the Hermes executable within a network by creating scheduled tasks over SMB sessions using hard-coded credentials.

In recent months, Ryuk binaries have continued to deviate further and further from the original Hermes source code, with the threat actors adding and removing functionality often. While doing dynamic analysis, it was not uncommon to observe Ryuk attempting to encrypt files related to the Windows Bootloader (C:\Boot) or other critical files and folders. In October 2017, we investigated an attack on a Taiwanese bank. Keeping our eyes open for falsifying facts and constantly questioning our results are essential steps to avoid conformation bias. net stop NetBackup BMR MTFTP Service /y

Previously, to remain persistent on the host, Ryuk created a registry entry under the Run key using Windows cmd.exe shell. !.rar, which translates to “files for work.”  Based on these factors, there is considerably more evidence supporting the hypothesis that the WIZARD SPIDER threat actors are Russian speakers and not North Korean.

. section at the end of this blog. Table 1 contains samples that are possibly attributed to the compromise. * e:\backup*.

The files could have been uploaded by a victim in Russia, but the time frame between the functionality being removed from Ryuk binaries and included in kill.bat was very short. After some time, Emotet will also install TrickBot, which ultimately opens a reverse shell to the Ryuk operators after harvesting sensitive information from compromised networks. The actor name GRIM SPIDER was introduced into CrowdStrike’s nomenclature in September 2018 for the group that operates the Ryuk ransomware as a distinct sub-group of the WIZARD SPIDER criminal enterprise. Finally, the AES key for each file is encrypted with the victim’s RSA public key, then stored at the end of the file. If changing a name and ransom note are part of these tuning options, then it is likely that Ryuk is an altered version Hermes 2.1. If the machine has the value 0419 (Russian), 0422 (Ukrainian) or 0423 (Belarusian), it call ExitProcess to stop executing.

When purchased, the buyer received a build that supported two email addresses, a decryptor and a unique RSA key pair. "After 1min or so of this the computers logged out and shutdown. * h:\backup*. section, Ryuk uses a combination of symmetric (AES) and asymmetric (RSA) encryption to encrypt files. * d:\backup*. could aid in recovering the credentials needed to compromise environments — the SOCKS module in particular has been observed tunneling PowerShell Empire traffic to perform reconnaissance and. Ryuk was tailored to target enterprise environments and some of the modifications include removing anti-analysis checks. Instead, Ryuk has two public RSA keys embedded in the executable, and what was previously the victim’s RSA private key is encrypted and embedded in the executable. Note that since the del command does not securely delete a file (i.e., overwrite a file before deletion), some level of file recovery may be possible using forensic tools. By ensuring that the process is not running under NT AUTHORITY, the developers are assuming the process is not running under another account and therefore can be written to. To check the host language, it queries the registry key, . As of this writing, it remains unclear if WIZARD SPIDER is copying the TTPs (tactics, techniques and procedures) and ransom notes of BitPaymer, or whether the groups may share information with each other. Figure 6. Example Hermes Footer with Encrypted AES Key. To check the host language, it queries the registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Nls\Language\ and the value InstallLanguage. del /s /f /q h:\*.VHD h:\*.bac h:\*.bak h:\*.wbcat h:\*.bkf h:\Backup*. The dropper checks whether the host is 32-bit or 64-bit by calling IsWow64Process and writes one of two embedded payload executables corresponding to the host’s architecture. The folder path is created by calling, and then inserting a null byte at the fourth character of the path. vssadmin resize shadowstorage /for=d: /on=d: /maxsize=401MB All of the executables except for Hermes were compiled with Visual Studio 10, with a linker of Visual Studio 10. RYK encrypts data using a cryptography algorithm, thereby rendering files stored on a computer unusable. sc config SQLTELEMETRY start= disabled While supporting an incident response investigation involving Ryuk, Falcon Intelligence noticed files related to the investigation being uploaded to a file-scanning website from an IP address in Moscow, Russia. One file was named. Recovery of Ryuk droppers are rare, due to the Ryuk executable payload deleting the dropper when executed.

In March 2018, Hermes was observed targeting users in South Korea via the GreenFlash Sundown exploit kit. According to Kremez, their Andariel intelligence platform detected both the Emotet and TrickBot Trojans affecting UHS Inc. throughout 2020, and more recently, in September 2020. Falcon Intelligence has been monitoring the geo-based download activity from Emotet and, during 2018, MUMMY SPIDER has been an avid supporter of WIZARD SPIDER, predominantly distributing TrickBot to Emotet victims in the U.K., the U.S., and Canada. * d:\*.set d:\*.win d:\*.dsk CrowdStrike Intelligence will now solely use the actor name WIZARD SPIDER in association with TrickBot and Ryuk. Artifacts do not all appear at once; a new piece of evidence unearthed years after an attack can shine a different light on an investigation and introduce new challenges to current assumptions. .

When purchased, the buyer received a build that supported two email addresses, a decryptor and a unique RSA key pair. It should be noted that absent from this list is sys (system drivers), ocx (OLE control extension) and other executable file types. The GRIM SPIDER actor name has been deprecated. Thus, it is highly likely that Ryuk pre-generates the RSA key pairs for each victim. * f:\*.set f:\*.win f:\*.dsk, del /s /f /q g:\*.VHD g:\*.bac g:\*.bak g:\*.wbcat g:\*.bkf g:\Backup*. One such error states: “Snapshots were found, but they were outside of your allowed context. Patient care continues to be delivered safely and effectively. Of these three new features, only the file extension is still present in an executable compiled on Dec. 20, 2018. The email addresses usually contain one address at protonmail.com and another address at tutanota.com. Searching earlier events, we noticed a posting from August 2017 in an underground forum in which a Russian-speaking actor offered the malware kit Hermes 2.1 ransomware: What if the actor who attacked the Taiwanese bank simply bought a copy of Hermes and added it to the campaign to cause the distraction? The Ryuk ransom note is written to a file named, . In the race to determine who is behind an attack, research facts (the What and How questions) are often put aside to focus on attribution (the Who question). This refers to functionality implemented in Hermes to check the host to ensure that it is not running on a Russian, Ukrainian, or Belarusian system. The batch file kill.bat contains commands for stopping services, disabling services and killing processes. net stop avpsus /y Ryuk ransom note Unfortunately, with ransomware attack, there is also a high chance of the attackers stealing patient and employee data which will further increase the damage. We used the term pseudo-ransomware to describe this attack.

Senior analyst Ryan Sherstobitoff contributed to this report.

The footer only contains the marker HERMES but not the exported AES key. The contents of the batch file are shown below in Figure 2. vssadmin resize shadowstorage /for=c: /on=c: /maxsize=401MB, vssadmin resize shadowstorage /for=c: /on=c: /maxsize=unbounded, vssadmin resize shadowstorage /for=d: /on=d: /maxsize=401MB, vssadmin resize shadowstorage /for=d: /on=d: /maxsize=unbounded, vssadmin resize shadowstorage /for=e: /on=e: /maxsize=401MB, vssadmin resize shadowstorage /for=e: /on=e: /maxsize=unbounded, vssadmin resize shadowstorage /for=f: /on=f: /maxsize=401MB, vssadmin resize shadowstorage /for=f: /on=f: /maxsize=unbounded, vssadmin resize shadowstorage /for=g: /on=g: /maxsize=401MB, vssadmin resize shadowstorage /for=g: /on=g: /maxsize=unbounded, vssadmin resize shadowstorage /for=h: /on=h: /maxsize=401MB, vssadmin resize shadowstorage /for=h: /on=h: /maxsize=unbounded, del /s /f /q c:\*.VHD c:\*.bac c:\*.bak c:\*.wbcat c:\*.bkf c:\Backup*.

sc config SQLTELEMETRY$ECWDB2 start= disabled, CrowdStrike has observed another batch file, named. We often come across manga-inspired nicknames and avatars in underground forums. Early versions of Ryuk included the whitelisting of ini and lnk files, but these have been removed in recent builds.

If the time stamps are correct, the two executables (bitsran.exe and RSW7B37.tmp) were compiled within four hours and three minutes of each other. Unlike other families of ransomware, Ryuk does not contain process/service termination and anti-recovery functionality embedded in the executable. The new ransom note can be seen below. For Windows XP, an example folder path would be C:\Documents and Settings\Default User\, and for Window Vista or higher, the path would be C:\Users\Public. net stop McAfeeDLPAgentService /y From a call-flow perspective, we notice the similarities and evolution of the code: The Hermes 2.1 ransomware kit, renamed and redistributed as Ryuk. Ryuk Ransom Note Bearing Strong Resemblance to BitPaymer. According to reports coming from UHS' employees, UHS hospitals in the US including those from California, Florida, Texas, Arizona, and Washington D.C. are left without access to computer and phone systems. Example Hermes Footer in FEIB SWIFT Attack with Encrypted AES Key Missing. * c:\backup*.

This approach is similar to. The command arguments are for, the deletion of a file. With 52 known transactions spread across 37 BTC addresses (as of this writing), WIZARD SPIDER has made 705.80 BTC, which has a current value of $3.7 million (USD). This suggests that WIZARD SPIDER (like INDRIK SPIDER with BitPaymer) calculates the ransom amount based on the size and value of the victim organization. Why go to the trouble to build something, when the actor can just buy the perfect distraction in an underground forum?

Last week, BleepingComputer reported that a ransomware attack affecting a German hospital led to the death of a patient in a life-threatening condition after she was redirected to a more distant hospital. If a single executable is used for a single victim environment, then there are no repercussions if the private keys are leaked because it will only decrypt the damage from a single Ryuk executable.

files dlya raboty !! Hermes is commodity. The Ryuk payload executable written by the dropper is the Ryuk component that contains the core logic for encrypting files on the host. Anti-Recovery window.bat Commands. is the Hermes ransomware executable. The following command line was used to write to the Registry Run Key name svchos to  HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run with the value being the path to the Ryuk executable. The dropper’s goal is to propagate the Hermes executable within a network by creating scheduled tasks over SMB sessions using hard-coded credentials.

In recent months, Ryuk binaries have continued to deviate further and further from the original Hermes source code, with the threat actors adding and removing functionality often. While doing dynamic analysis, it was not uncommon to observe Ryuk attempting to encrypt files related to the Windows Bootloader (C:\Boot) or other critical files and folders. In October 2017, we investigated an attack on a Taiwanese bank. Keeping our eyes open for falsifying facts and constantly questioning our results are essential steps to avoid conformation bias. net stop NetBackup BMR MTFTP Service /y

Previously, to remain persistent on the host, Ryuk created a registry entry under the Run key using Windows cmd.exe shell. !.rar, which translates to “files for work.”  Based on these factors, there is considerably more evidence supporting the hypothesis that the WIZARD SPIDER threat actors are Russian speakers and not North Korean.

. section at the end of this blog. Table 1 contains samples that are possibly attributed to the compromise. * e:\backup*.

The files could have been uploaded by a victim in Russia, but the time frame between the functionality being removed from Ryuk binaries and included in kill.bat was very short. After some time, Emotet will also install TrickBot, which ultimately opens a reverse shell to the Ryuk operators after harvesting sensitive information from compromised networks. The actor name GRIM SPIDER was introduced into CrowdStrike’s nomenclature in September 2018 for the group that operates the Ryuk ransomware as a distinct sub-group of the WIZARD SPIDER criminal enterprise. Finally, the AES key for each file is encrypted with the victim’s RSA public key, then stored at the end of the file. If changing a name and ransom note are part of these tuning options, then it is likely that Ryuk is an altered version Hermes 2.1. If the machine has the value 0419 (Russian), 0422 (Ukrainian) or 0423 (Belarusian), it call ExitProcess to stop executing.

When purchased, the buyer received a build that supported two email addresses, a decryptor and a unique RSA key pair. "After 1min or so of this the computers logged out and shutdown. * h:\backup*. section, Ryuk uses a combination of symmetric (AES) and asymmetric (RSA) encryption to encrypt files. * d:\backup*. could aid in recovering the credentials needed to compromise environments — the SOCKS module in particular has been observed tunneling PowerShell Empire traffic to perform reconnaissance and. Ryuk was tailored to target enterprise environments and some of the modifications include removing anti-analysis checks. Instead, Ryuk has two public RSA keys embedded in the executable, and what was previously the victim’s RSA private key is encrypted and embedded in the executable. Note that since the del command does not securely delete a file (i.e., overwrite a file before deletion), some level of file recovery may be possible using forensic tools. By ensuring that the process is not running under NT AUTHORITY, the developers are assuming the process is not running under another account and therefore can be written to. To check the host language, it queries the registry key, . As of this writing, it remains unclear if WIZARD SPIDER is copying the TTPs (tactics, techniques and procedures) and ransom notes of BitPaymer, or whether the groups may share information with each other. Figure 6. Example Hermes Footer with Encrypted AES Key. To check the host language, it queries the registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Nls\Language\ and the value InstallLanguage. del /s /f /q h:\*.VHD h:\*.bac h:\*.bak h:\*.wbcat h:\*.bkf h:\Backup*. The dropper checks whether the host is 32-bit or 64-bit by calling IsWow64Process and writes one of two embedded payload executables corresponding to the host’s architecture. The folder path is created by calling, and then inserting a null byte at the fourth character of the path. vssadmin resize shadowstorage /for=d: /on=d: /maxsize=401MB All of the executables except for Hermes were compiled with Visual Studio 10, with a linker of Visual Studio 10. RYK encrypts data using a cryptography algorithm, thereby rendering files stored on a computer unusable. sc config SQLTELEMETRY start= disabled While supporting an incident response investigation involving Ryuk, Falcon Intelligence noticed files related to the investigation being uploaded to a file-scanning website from an IP address in Moscow, Russia. One file was named. Recovery of Ryuk droppers are rare, due to the Ryuk executable payload deleting the dropper when executed.

In March 2018, Hermes was observed targeting users in South Korea via the GreenFlash Sundown exploit kit. According to Kremez, their Andariel intelligence platform detected both the Emotet and TrickBot Trojans affecting UHS Inc. throughout 2020, and more recently, in September 2020. Falcon Intelligence has been monitoring the geo-based download activity from Emotet and, during 2018, MUMMY SPIDER has been an avid supporter of WIZARD SPIDER, predominantly distributing TrickBot to Emotet victims in the U.K., the U.S., and Canada. * d:\*.set d:\*.win d:\*.dsk CrowdStrike Intelligence will now solely use the actor name WIZARD SPIDER in association with TrickBot and Ryuk. Artifacts do not all appear at once; a new piece of evidence unearthed years after an attack can shine a different light on an investigation and introduce new challenges to current assumptions. .

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