remcos | de044337b12eb226975f080442f42dd95b506d2ae96fdb6473d5143bc35302ea

Virtualization/Sandbox Evasion

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Oracle\VirtualBox Guest Additions	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe
Key opened	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Oracle\VirtualBox Guest Additions	WeChatsetup.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
2860	powershell.exe
2536	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_d9be6e743c8b0aa8b4b90317c7e67c82.exe
Key opened	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\VMware, Inc.\VMware Tools	WeChatsetup.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

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	WeChatsetup.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	WeChatsetup.exe

Executes dropped EXE 2 IoCs

pid	Process
1660	WeChatsetup.exe
1312	WeChatsetup.exe

Loads dropped DLL 2 IoCs

pid	Process
1344	cmd.exe
1660	WeChatsetup.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-1-5-21-1163522206-1469769407-485553996-1000\Software\Microsoft\Windows\CurrentVersion\Run\WeChatx = "\"C:\\Users\\Admin\\AppData\\Roaming\\WeChatx\\WeChatsetup.exe\""	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1163522206-1469769407-485553996-1000\Software\Microsoft\Windows\CurrentVersion\Run\WeChatx = "\"C:\\Users\\Admin\\AppData\\Roaming\\WeChatx\\WeChatsetup.exe\""	WeChatsetup.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

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	WeChatsetup.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	WeChatsetup.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 800 set thread context of 2724	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	38
PID 1660 set thread context of 1312	1660	WeChatsetup.exe	46

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_d9be6e743c8b0aa8b4b90317c7e67c82.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.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	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WeChatsetup.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe

Modifies Internet Explorer settings 1 TTPs 2 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1163522206-1469769407-485553996-1000\Software\Microsoft\Internet Explorer\Main	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe
Key created	\REGISTRY\USER\S-1-5-21-1163522206-1469769407-485553996-1000\Software\Microsoft\Internet Explorer\Main	WeChatsetup.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
1832	schtasks.exe
676	schtasks.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe
800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe
800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe
800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe
800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe
800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe
2860	powershell.exe
1660	WeChatsetup.exe
2536	powershell.exe
1660	WeChatsetup.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe
Token: SeDebugPrivilege	2860	powershell.exe
Token: SeDebugPrivilege	1660	WeChatsetup.exe
Token: SeDebugPrivilege	2536	powershell.exe

Suspicious use of SetWindowsHookEx 5 IoCs

pid	Process
800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe
800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe
1660	WeChatsetup.exe
1660	WeChatsetup.exe
1312	WeChatsetup.exe

Suspicious use of WriteProcessMemory 64 IoCs

description	pid	Process	procid_target
PID 800 wrote to memory of 2860	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	31
PID 800 wrote to memory of 2860	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	31
PID 800 wrote to memory of 2860	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	31
PID 800 wrote to memory of 2860	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	31
PID 800 wrote to memory of 1832	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	34
PID 800 wrote to memory of 1832	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	34
PID 800 wrote to memory of 1832	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	34
PID 800 wrote to memory of 1832	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	34
PID 800 wrote to memory of 2672	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	36
PID 800 wrote to memory of 2672	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	36
PID 800 wrote to memory of 2672	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	36
PID 800 wrote to memory of 2672	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	36
PID 800 wrote to memory of 2692	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	37
PID 800 wrote to memory of 2692	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	37
PID 800 wrote to memory of 2692	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	37
PID 800 wrote to memory of 2692	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	37
PID 800 wrote to memory of 2724	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	38
PID 800 wrote to memory of 2724	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	38
PID 800 wrote to memory of 2724	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	38
PID 800 wrote to memory of 2724	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	38
PID 800 wrote to memory of 2724	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	38
PID 800 wrote to memory of 2724	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	38
PID 800 wrote to memory of 2724	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	38
PID 800 wrote to memory of 2724	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	38
PID 800 wrote to memory of 2724	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	38
PID 800 wrote to memory of 2724	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	38
PID 800 wrote to memory of 2724	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	38
PID 800 wrote to memory of 2724	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	38
PID 800 wrote to memory of 2724	800	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	38
PID 2724 wrote to memory of 1504	2724	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	39
PID 2724 wrote to memory of 1504	2724	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	39
PID 2724 wrote to memory of 1504	2724	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	39
PID 2724 wrote to memory of 1504	2724	JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe	39
PID 1504 wrote to memory of 1344	1504	WScript.exe	40
PID 1504 wrote to memory of 1344	1504	WScript.exe	40
PID 1504 wrote to memory of 1344	1504	WScript.exe	40
PID 1504 wrote to memory of 1344	1504	WScript.exe	40
PID 1344 wrote to memory of 1660	1344	cmd.exe	42
PID 1344 wrote to memory of 1660	1344	cmd.exe	42
PID 1344 wrote to memory of 1660	1344	cmd.exe	42
PID 1344 wrote to memory of 1660	1344	cmd.exe	42
PID 1344 wrote to memory of 1660	1344	cmd.exe	42
PID 1344 wrote to memory of 1660	1344	cmd.exe	42
PID 1344 wrote to memory of 1660	1344	cmd.exe	42
PID 1660 wrote to memory of 2536	1660	WeChatsetup.exe	43
PID 1660 wrote to memory of 2536	1660	WeChatsetup.exe	43
PID 1660 wrote to memory of 2536	1660	WeChatsetup.exe	43
PID 1660 wrote to memory of 2536	1660	WeChatsetup.exe	43
PID 1660 wrote to memory of 676	1660	WeChatsetup.exe	45
PID 1660 wrote to memory of 676	1660	WeChatsetup.exe	45
PID 1660 wrote to memory of 676	1660	WeChatsetup.exe	45
PID 1660 wrote to memory of 676	1660	WeChatsetup.exe	45
PID 1660 wrote to memory of 1312	1660	WeChatsetup.exe	46
PID 1660 wrote to memory of 1312	1660	WeChatsetup.exe	46
PID 1660 wrote to memory of 1312	1660	WeChatsetup.exe	46
PID 1660 wrote to memory of 1312	1660	WeChatsetup.exe	46
PID 1660 wrote to memory of 1312	1660	WeChatsetup.exe	46
PID 1660 wrote to memory of 1312	1660	WeChatsetup.exe	46
PID 1660 wrote to memory of 1312	1660	WeChatsetup.exe	46
PID 1660 wrote to memory of 1312	1660	WeChatsetup.exe	46
PID 1660 wrote to memory of 1312	1660	WeChatsetup.exe	46
PID 1660 wrote to memory of 1312	1660	WeChatsetup.exe	46
PID 1660 wrote to memory of 1312	1660	WeChatsetup.exe	46
PID 1660 wrote to memory of 1312	1660	WeChatsetup.exe	46

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe"
1⤵
- Looks for VirtualBox Guest Additions in registry
- Looks for VMWare Tools registry key
- Checks BIOS information in registry
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Modifies Internet Explorer settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:800
- 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_d9be6e743c8b0aa8b4b90317c7e67c82.exe"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2860
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\NUrruv" /XML "C:\Users\Admin\AppData\Local\Temp\tmp16FA.tmp"
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:1832
- C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe
  "C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe"
  2⤵
  PID:2672
- C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe
  "C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe"
  2⤵
  PID:2692
- C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe
  "C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_d9be6e743c8b0aa8b4b90317c7e67c82.exe"
  2⤵
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2724
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:1504
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\WeChatx\WeChatsetup.exe"
      4⤵
      Loads dropped DLL
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:1344
    - - C:\Users\Admin\AppData\Roaming\WeChatx\WeChatsetup.exe
        
        C:\Users\Admin\AppData\Roaming\WeChatx\WeChatsetup.exe
        5⤵
        Looks for VirtualBox Guest Additions in registry
        Looks for VMWare Tools registry key
        Checks BIOS information in registry
        Executes dropped EXE
        Loads dropped DLL
        Maps connected drives based on registry
        Suspicious use of SetThreadContext
        System Location Discovery: System Language Discovery
        Modifies Internet Explorer settings
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:1660
      - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\WeChatx\WeChatsetup.exe"
        6⤵
        Command and Scripting Interpreter: PowerShell
        System Location Discovery: System Language Discovery
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2536
      - C:\Windows\SysWOW64\schtasks.exe
        
        "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\NUrruv" /XML "C:\Users\Admin\AppData\Local\Temp\tmpCC73.tmp"
        6⤵
        System Location Discovery: System Language Discovery
        Scheduled Task/Job: Scheduled Task
        
        PID:676
      - C:\Users\Admin\AppData\Roaming\WeChatx\WeChatsetup.exe
        
        "C:\Users\Admin\AppData\Roaming\WeChatx\WeChatsetup.exe"
        6⤵
        Executes dropped EXE
        Adds Run key to start application
        Suspicious use of SetWindowsHookEx
        
        PID:1312

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

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Virtualization/Sandbox Evasion