remcos | d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd

Virtualization/Sandbox Evasion

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Oracle\VirtualBox Guest Additions	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.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
1832	powershell.exe
64	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	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.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	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.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-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	wechatx.exe
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe

Executes dropped EXE 2 IoCs

pid	Process
2096	wechatx.exe
216	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-1-5-21-940901362-3608833189-1915618603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\wechat = "\"C:\\Users\\Admin\\AppData\\Roaming\\wechat\\wechatx.exe\""	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\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	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	wechatx.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0	wechatx.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1712 set thread context of 3024	1712	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	102
PID 2096 set thread context of 216	2096	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	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wechatx.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	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000_Classes\Local Settings	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.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
2340	schtasks.exe
3888	schtasks.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
1712	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
1832	powershell.exe
1712	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
1832	powershell.exe
2096	wechatx.exe
64	powershell.exe
2096	wechatx.exe
64	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	1712	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
Token: SeDebugPrivilege	1832	powershell.exe
Token: SeDebugPrivilege	2096	wechatx.exe
Token: SeDebugPrivilege	64	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
216	wechatx.exe

Suspicious use of WriteProcessMemory 45 IoCs

description	pid	Process	procid_target
PID 1712 wrote to memory of 1832	1712	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	99
PID 1712 wrote to memory of 1832	1712	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	99
PID 1712 wrote to memory of 1832	1712	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	99
PID 1712 wrote to memory of 2340	1712	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	101
PID 1712 wrote to memory of 2340	1712	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	101
PID 1712 wrote to memory of 2340	1712	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	101
PID 1712 wrote to memory of 3024	1712	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	102
PID 1712 wrote to memory of 3024	1712	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	102
PID 1712 wrote to memory of 3024	1712	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	102
PID 1712 wrote to memory of 3024	1712	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	102
PID 1712 wrote to memory of 3024	1712	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	102
PID 1712 wrote to memory of 3024	1712	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	102
PID 1712 wrote to memory of 3024	1712	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	102
PID 1712 wrote to memory of 3024	1712	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	102
PID 1712 wrote to memory of 3024	1712	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	102
PID 1712 wrote to memory of 3024	1712	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	102
PID 1712 wrote to memory of 3024	1712	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	102
PID 1712 wrote to memory of 3024	1712	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	102
PID 3024 wrote to memory of 4432	3024	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	104
PID 3024 wrote to memory of 4432	3024	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	104
PID 3024 wrote to memory of 4432	3024	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	104
PID 4432 wrote to memory of 2660	4432	WScript.exe	105
PID 4432 wrote to memory of 2660	4432	WScript.exe	105
PID 4432 wrote to memory of 2660	4432	WScript.exe	105
PID 2660 wrote to memory of 2096	2660	cmd.exe	107
PID 2660 wrote to memory of 2096	2660	cmd.exe	107
PID 2660 wrote to memory of 2096	2660	cmd.exe	107
PID 2096 wrote to memory of 64	2096	wechatx.exe	109
PID 2096 wrote to memory of 64	2096	wechatx.exe	109
PID 2096 wrote to memory of 64	2096	wechatx.exe	109
PID 2096 wrote to memory of 3888	2096	wechatx.exe	111
PID 2096 wrote to memory of 3888	2096	wechatx.exe	111
PID 2096 wrote to memory of 3888	2096	wechatx.exe	111
PID 2096 wrote to memory of 216	2096	wechatx.exe	112
PID 2096 wrote to memory of 216	2096	wechatx.exe	112
PID 2096 wrote to memory of 216	2096	wechatx.exe	112
PID 2096 wrote to memory of 216	2096	wechatx.exe	112
PID 2096 wrote to memory of 216	2096	wechatx.exe	112
PID 2096 wrote to memory of 216	2096	wechatx.exe	112
PID 2096 wrote to memory of 216	2096	wechatx.exe	112
PID 2096 wrote to memory of 216	2096	wechatx.exe	112
PID 2096 wrote to memory of 216	2096	wechatx.exe	112
PID 2096 wrote to memory of 216	2096	wechatx.exe	112
PID 2096 wrote to memory of 216	2096	wechatx.exe	112
PID 2096 wrote to memory of 216	2096	wechatx.exe	112

C:\Users\Admin\AppData\Local\Temp\d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
"C:\Users\Admin\AppData\Local\Temp\d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.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:1712
- 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\d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1832
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\nQrtksOG" /XML "C:\Users\Admin\AppData\Local\Temp\tmp3AA3.tmp"
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:2340
- C:\Users\Admin\AppData\Local\Temp\d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
  "C:\Users\Admin\AppData\Local\Temp\d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.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:3024
- - 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:4432
  - - 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:2660
    - - 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:2096
      - 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:64
      - C:\Windows\SysWOW64\schtasks.exe
        
        "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\nQrtksOG" /XML "C:\Users\Admin\AppData\Local\Temp\tmpD230.tmp"
        6⤵
        System Location Discovery: System Language Discovery
        Scheduled Task/Job: Scheduled Task
        
        PID:3888
      - 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:216

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