remcos | d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd

Virtualization/Sandbox Evasion

Processes:

wechatx.exed20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Oracle\VirtualBox Guest Additions	wechatx.exe
Key opened	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Oracle\VirtualBox Guest Additions	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.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

Processes:

powershell.exepowershell.exe

pid process

2852 powershell.exe
2164 powershell.exe

pid	process
2852	powershell.exe
2164	powershell.exe

Looks for VMWare Tools registry key 2 TTPs 2 IoCs

evasion

Query Registry

Virtualization/Sandbox Evasion

Processes:

d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exewechatx.exe

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

T1082

Processes:

d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exewechatx.exe

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

Executes dropped EXE 2 IoCs

Processes:

wechatx.exewechatx.exe

pid process

560 wechatx.exe
2184 wechatx.exe
Loads dropped DLL 1 IoCs

Processes:

cmd.exe

pid process

3048 cmd.exe

pid	process
560	wechatx.exe
2184	wechatx.exe

pid	process
3048	cmd.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exewechatx.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-1163522206-1469769407-485553996-1000\Software\Microsoft\Windows\CurrentVersion\Run\wechat = "\"C:\\Users\\Admin\\AppData\\Roaming\\wechat\\wechatx.exe\""	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1163522206-1469769407-485553996-1000\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

T1082

Processes:

wechatx.exed20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe

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	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe

Suspicious use of SetThreadContext 2 IoCs

Processes:

d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exewechatx.exe

description	pid	process	target process
PID 2596 set thread context of 2696	2596	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
PID 560 set thread context of 2184	560	wechatx.exe	wechatx.exe

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

Processes:

powershell.execmd.exewechatx.exeschtasks.exed20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exed20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exeschtasks.exeWScript.exepowershell.exe

description	ioc	process
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
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	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	powershell.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
T1053.005

Processes:

schtasks.exeschtasks.exe

pid process

2964 schtasks.exe
2588 schtasks.exe

pid	process
2964	schtasks.exe
2588	schtasks.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

Processes:

d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exepowershell.exewechatx.exepowershell.exe

pid	process
2596	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
2596	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
2852	powershell.exe
560	wechatx.exe
2164	powershell.exe
560	wechatx.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exepowershell.exewechatx.exepowershell.exe

description	pid	process
Token: SeDebugPrivilege	2596	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
Token: SeDebugPrivilege	2852	powershell.exe
Token: SeDebugPrivilege	560	wechatx.exe
Token: SeDebugPrivilege	2164	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

wechatx.exe

pid process

2184 wechatx.exe

pid	process
2184	wechatx.exe

Suspicious use of WriteProcessMemory 54 IoCs

Processes:

d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exed20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exeWScript.execmd.exewechatx.exe

description	pid	process	target process
PID 2596 wrote to memory of 2852	2596	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	powershell.exe
PID 2596 wrote to memory of 2852	2596	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	powershell.exe
PID 2596 wrote to memory of 2852	2596	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	powershell.exe
PID 2596 wrote to memory of 2852	2596	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	powershell.exe
PID 2596 wrote to memory of 2964	2596	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	schtasks.exe
PID 2596 wrote to memory of 2964	2596	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	schtasks.exe
PID 2596 wrote to memory of 2964	2596	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	schtasks.exe
PID 2596 wrote to memory of 2964	2596	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	schtasks.exe
PID 2596 wrote to memory of 2696	2596	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
PID 2596 wrote to memory of 2696	2596	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
PID 2596 wrote to memory of 2696	2596	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
PID 2596 wrote to memory of 2696	2596	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
PID 2596 wrote to memory of 2696	2596	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
PID 2596 wrote to memory of 2696	2596	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
PID 2596 wrote to memory of 2696	2596	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
PID 2596 wrote to memory of 2696	2596	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
PID 2596 wrote to memory of 2696	2596	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
PID 2596 wrote to memory of 2696	2596	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
PID 2596 wrote to memory of 2696	2596	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
PID 2596 wrote to memory of 2696	2596	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
PID 2596 wrote to memory of 2696	2596	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
PID 2696 wrote to memory of 1512	2696	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	WScript.exe
PID 2696 wrote to memory of 1512	2696	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	WScript.exe
PID 2696 wrote to memory of 1512	2696	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	WScript.exe
PID 2696 wrote to memory of 1512	2696	d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe	WScript.exe
PID 1512 wrote to memory of 3048	1512	WScript.exe	cmd.exe
PID 1512 wrote to memory of 3048	1512	WScript.exe	cmd.exe
PID 1512 wrote to memory of 3048	1512	WScript.exe	cmd.exe
PID 1512 wrote to memory of 3048	1512	WScript.exe	cmd.exe
PID 3048 wrote to memory of 560	3048	cmd.exe	wechatx.exe
PID 3048 wrote to memory of 560	3048	cmd.exe	wechatx.exe
PID 3048 wrote to memory of 560	3048	cmd.exe	wechatx.exe
PID 3048 wrote to memory of 560	3048	cmd.exe	wechatx.exe
PID 560 wrote to memory of 2164	560	wechatx.exe	powershell.exe
PID 560 wrote to memory of 2164	560	wechatx.exe	powershell.exe
PID 560 wrote to memory of 2164	560	wechatx.exe	powershell.exe
PID 560 wrote to memory of 2164	560	wechatx.exe	powershell.exe
PID 560 wrote to memory of 2588	560	wechatx.exe	schtasks.exe
PID 560 wrote to memory of 2588	560	wechatx.exe	schtasks.exe
PID 560 wrote to memory of 2588	560	wechatx.exe	schtasks.exe
PID 560 wrote to memory of 2588	560	wechatx.exe	schtasks.exe
PID 560 wrote to memory of 2184	560	wechatx.exe	wechatx.exe
PID 560 wrote to memory of 2184	560	wechatx.exe	wechatx.exe
PID 560 wrote to memory of 2184	560	wechatx.exe	wechatx.exe
PID 560 wrote to memory of 2184	560	wechatx.exe	wechatx.exe
PID 560 wrote to memory of 2184	560	wechatx.exe	wechatx.exe
PID 560 wrote to memory of 2184	560	wechatx.exe	wechatx.exe
PID 560 wrote to memory of 2184	560	wechatx.exe	wechatx.exe
PID 560 wrote to memory of 2184	560	wechatx.exe	wechatx.exe
PID 560 wrote to memory of 2184	560	wechatx.exe	wechatx.exe
PID 560 wrote to memory of 2184	560	wechatx.exe	wechatx.exe
PID 560 wrote to memory of 2184	560	wechatx.exe	wechatx.exe
PID 560 wrote to memory of 2184	560	wechatx.exe	wechatx.exe
PID 560 wrote to memory of 2184	560	wechatx.exe	wechatx.exe

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
- 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:2596
- 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:2852
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\nQrtksOG" /XML "C:\Users\Admin\AppData\Local\Temp\tmp45B7.tmp"
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:2964
- C:\Users\Admin\AppData\Local\Temp\d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe
  "C:\Users\Admin\AppData\Local\Temp\d20d9351c55cbb7b216cd50bbbf3557c933a049c15b842363275458614bd64cd.exe"
  2⤵
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2696
- - 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:1512
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\wechat\wechatx.exe"
      4⤵
      Loads dropped DLL
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:3048
    - - 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
        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:560
      - 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:2164
      - C:\Windows\SysWOW64\schtasks.exe
        
        "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\nQrtksOG" /XML "C:\Users\Admin\AppData\Local\Temp\tmpE2A2.tmp"
        6⤵
        System Location Discovery: System Language Discovery
        Scheduled Task/Job: Scheduled Task
        
        PID:2588
      - 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:2184

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

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Modify Registry

T1112

Virtualization/Sandbox Evasion

2

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

3

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Virtualization/Sandbox Evasion

2