remcos | 9cf41a9b8963753aa8d20e7f1f3ecea05f5ff876b15487682663d115a676117f

Virtualization/Sandbox Evasion

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Oracle\VirtualBox Guest Additions	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe
Key opened	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Oracle\VirtualBox Guest Additions	wechatx.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
3284	powershell.exe
4484	powershell.exe

Looks for VMWare Tools registry key 2 TTPs 2 IoCs

evasion

Query Registry

Virtualization/Sandbox Evasion

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\VMware, Inc.\VMware Tools	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe
Key opened	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\VMware, Inc.\VMware Tools	wechatx.exe

Checks BIOS information in registry 2 TTPs 4 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	wechatx.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	wechatx.exe

Checks computer location settings 2 TTPs 4 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	wechatx.exe

Executes dropped EXE 2 IoCs

pid	Process
4988	wechatx.exe
556	wechatx.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\wechat = "\"C:\\Users\\Admin\\AppData\\Roaming\\wechat\\wechatx.exe\""	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\wechat = "\"C:\\Users\\Admin\\AppData\\Roaming\\wechat\\wechatx.exe\""	wechatx.exe

Maps connected drives based on registry 3 TTPs 4 IoCs

Disk information is often read in order to detect sandboxing environments.

Query Registry

Peripheral Device Discovery

T1120

System Information Discovery

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	wechatx.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0	wechatx.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1928 set thread context of 1160	1928	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe	90
PID 4988 set thread context of 556	4988	wechatx.exe	112

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 9 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wechatx.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000_Classes\Local Settings	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

pid	Process
2860	schtasks.exe
2468	schtasks.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
1928	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe
3284	powershell.exe
1928	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe
3284	powershell.exe
4988	wechatx.exe
4988	wechatx.exe
4484	powershell.exe
4484	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	1928	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe
Token: SeDebugPrivilege	3284	powershell.exe
Token: SeDebugPrivilege	4988	wechatx.exe
Token: SeDebugPrivilege	4484	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
556	wechatx.exe

Suspicious use of WriteProcessMemory 45 IoCs

description	pid	Process	procid_target
PID 1928 wrote to memory of 3284	1928	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe	87
PID 1928 wrote to memory of 3284	1928	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe	87
PID 1928 wrote to memory of 3284	1928	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe	87
PID 1928 wrote to memory of 2860	1928	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe	89
PID 1928 wrote to memory of 2860	1928	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe	89
PID 1928 wrote to memory of 2860	1928	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe	89
PID 1928 wrote to memory of 1160	1928	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe	90
PID 1928 wrote to memory of 1160	1928	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe	90
PID 1928 wrote to memory of 1160	1928	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe	90
PID 1928 wrote to memory of 1160	1928	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe	90
PID 1928 wrote to memory of 1160	1928	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe	90
PID 1928 wrote to memory of 1160	1928	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe	90
PID 1928 wrote to memory of 1160	1928	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe	90
PID 1928 wrote to memory of 1160	1928	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe	90
PID 1928 wrote to memory of 1160	1928	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe	90
PID 1928 wrote to memory of 1160	1928	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe	90
PID 1928 wrote to memory of 1160	1928	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe	90
PID 1928 wrote to memory of 1160	1928	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe	90
PID 1160 wrote to memory of 728	1160	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe	92
PID 1160 wrote to memory of 728	1160	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe	92
PID 1160 wrote to memory of 728	1160	JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe	92
PID 728 wrote to memory of 1720	728	WScript.exe	93
PID 728 wrote to memory of 1720	728	WScript.exe	93
PID 728 wrote to memory of 1720	728	WScript.exe	93
PID 1720 wrote to memory of 4988	1720	cmd.exe	95
PID 1720 wrote to memory of 4988	1720	cmd.exe	95
PID 1720 wrote to memory of 4988	1720	cmd.exe	95
PID 4988 wrote to memory of 4484	4988	wechatx.exe	109
PID 4988 wrote to memory of 4484	4988	wechatx.exe	109
PID 4988 wrote to memory of 4484	4988	wechatx.exe	109
PID 4988 wrote to memory of 2468	4988	wechatx.exe	111
PID 4988 wrote to memory of 2468	4988	wechatx.exe	111
PID 4988 wrote to memory of 2468	4988	wechatx.exe	111
PID 4988 wrote to memory of 556	4988	wechatx.exe	112
PID 4988 wrote to memory of 556	4988	wechatx.exe	112
PID 4988 wrote to memory of 556	4988	wechatx.exe	112
PID 4988 wrote to memory of 556	4988	wechatx.exe	112
PID 4988 wrote to memory of 556	4988	wechatx.exe	112
PID 4988 wrote to memory of 556	4988	wechatx.exe	112
PID 4988 wrote to memory of 556	4988	wechatx.exe	112
PID 4988 wrote to memory of 556	4988	wechatx.exe	112
PID 4988 wrote to memory of 556	4988	wechatx.exe	112
PID 4988 wrote to memory of 556	4988	wechatx.exe	112
PID 4988 wrote to memory of 556	4988	wechatx.exe	112
PID 4988 wrote to memory of 556	4988	wechatx.exe	112

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe"
1⤵
- Looks for VirtualBox Guest Additions in registry
- Looks for VMWare Tools registry key
- Checks BIOS information in registry
- Checks computer location settings
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1928
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3284
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\nQrtksOG" /XML "C:\Users\Admin\AppData\Local\Temp\tmp6992.tmp"
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:2860
- C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe
  "C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_ccb20ed4f2e000c0dfea6ffa34bda6b4.exe"
  2⤵
  - Checks computer location settings
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:1160
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
    3⤵
    - Checks computer location settings
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:728
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\wechat\wechatx.exe"
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:1720
    - - C:\Users\Admin\AppData\Roaming\wechat\wechatx.exe
        
        C:\Users\Admin\AppData\Roaming\wechat\wechatx.exe
        5⤵
        Looks for VirtualBox Guest Additions in registry
        Looks for VMWare Tools registry key
        Checks BIOS information in registry
        Checks computer location settings
        Executes dropped EXE
        Maps connected drives based on registry
        Suspicious use of SetThreadContext
        System Location Discovery: System Language Discovery
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:4988
      - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\wechat\wechatx.exe"
        6⤵
        Command and Scripting Interpreter: PowerShell
        System Location Discovery: System Language Discovery
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:4484
      - C:\Windows\SysWOW64\schtasks.exe
        
        "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\nQrtksOG" /XML "C:\Users\Admin\AppData\Local\Temp\tmpF3B2.tmp"
        6⤵
        System Location Discovery: System Language Discovery
        Scheduled Task/Job: Scheduled Task
        
        PID:2468
      - C:\Users\Admin\AppData\Roaming\wechat\wechatx.exe
        
        "C:\Users\Admin\AppData\Roaming\wechat\wechatx.exe"
        6⤵
        Executes dropped EXE
        Adds Run key to start application
        Suspicious use of SetWindowsHookEx
        
        PID:556

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Scheduled Task

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

Defense Evasion

Modify Registry

T1112

Virtualization/Sandbox Evasion

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

System Information Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Virtualization/Sandbox Evasion