remcos | 3103ebb8576654b0f3ef393bb5c860e93fb69ab8400e01295b25b0f244b34c61

Virtualization/Sandbox Evasion

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SOFTWARE\Oracle\VirtualBox Guest Additions	3103ebb8576654b0f3ef393bb5c860e93fb69ab8400e01295b25b0f244b34c61.exe
Key opened	\REGISTRY\MACHINE\SOFTWARE\Oracle\VirtualBox Guest Additions	svchost.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\VMware, Inc.\VMware Tools	3103ebb8576654b0f3ef393bb5c860e93fb69ab8400e01295b25b0f244b34c61.exe
Key opened	\REGISTRY\MACHINE\SOFTWARE\VMware, Inc.\VMware Tools	svchost.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\VideoBiosVersion	3103ebb8576654b0f3ef393bb5c860e93fb69ab8400e01295b25b0f244b34c61.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	svchost.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	svchost.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	3103ebb8576654b0f3ef393bb5c860e93fb69ab8400e01295b25b0f244b34c61.exe

Executes dropped EXE 1 IoCs

pid	Process
2532	svchost.exe

Loads dropped DLL 1 IoCs

pid	Process
3024	cmd.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-330940541-141609230-1670313778-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchost = "\"C:\\Users\\Admin\\AppData\\Roaming\\svchost.exe\""	3103ebb8576654b0f3ef393bb5c860e93fb69ab8400e01295b25b0f244b34c61.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 value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	3103ebb8576654b0f3ef393bb5c860e93fb69ab8400e01295b25b0f244b34c61.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	3103ebb8576654b0f3ef393bb5c860e93fb69ab8400e01295b25b0f244b34c61.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	svchost.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2532 set thread context of 2660	2532	svchost.exe	36

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

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

persistence

Scheduled Task/Job

pid	Process
2920	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2476	timeout.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
1412	3103ebb8576654b0f3ef393bb5c860e93fb69ab8400e01295b25b0f244b34c61.exe
1412	3103ebb8576654b0f3ef393bb5c860e93fb69ab8400e01295b25b0f244b34c61.exe
1412	3103ebb8576654b0f3ef393bb5c860e93fb69ab8400e01295b25b0f244b34c61.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1412	3103ebb8576654b0f3ef393bb5c860e93fb69ab8400e01295b25b0f244b34c61.exe
Token: SeDebugPrivilege	2532	svchost.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2660	InstallUtil.exe

Suspicious use of WriteProcessMemory 31 IoCs

description	pid	Process	procid_target
PID 1412 wrote to memory of 2652	1412	3103ebb8576654b0f3ef393bb5c860e93fb69ab8400e01295b25b0f244b34c61.exe	29
PID 1412 wrote to memory of 2652	1412	3103ebb8576654b0f3ef393bb5c860e93fb69ab8400e01295b25b0f244b34c61.exe	29
PID 1412 wrote to memory of 2652	1412	3103ebb8576654b0f3ef393bb5c860e93fb69ab8400e01295b25b0f244b34c61.exe	29
PID 1412 wrote to memory of 3024	1412	3103ebb8576654b0f3ef393bb5c860e93fb69ab8400e01295b25b0f244b34c61.exe	31
PID 1412 wrote to memory of 3024	1412	3103ebb8576654b0f3ef393bb5c860e93fb69ab8400e01295b25b0f244b34c61.exe	31
PID 1412 wrote to memory of 3024	1412	3103ebb8576654b0f3ef393bb5c860e93fb69ab8400e01295b25b0f244b34c61.exe	31
PID 2652 wrote to memory of 2920	2652	cmd.exe	33
PID 2652 wrote to memory of 2920	2652	cmd.exe	33
PID 2652 wrote to memory of 2920	2652	cmd.exe	33
PID 3024 wrote to memory of 2476	3024	cmd.exe	34
PID 3024 wrote to memory of 2476	3024	cmd.exe	34
PID 3024 wrote to memory of 2476	3024	cmd.exe	34
PID 3024 wrote to memory of 2532	3024	cmd.exe	35
PID 3024 wrote to memory of 2532	3024	cmd.exe	35
PID 3024 wrote to memory of 2532	3024	cmd.exe	35
PID 2532 wrote to memory of 2660	2532	svchost.exe	36
PID 2532 wrote to memory of 2660	2532	svchost.exe	36
PID 2532 wrote to memory of 2660	2532	svchost.exe	36
PID 2532 wrote to memory of 2660	2532	svchost.exe	36
PID 2532 wrote to memory of 2660	2532	svchost.exe	36
PID 2532 wrote to memory of 2660	2532	svchost.exe	36
PID 2532 wrote to memory of 2660	2532	svchost.exe	36
PID 2532 wrote to memory of 2660	2532	svchost.exe	36
PID 2532 wrote to memory of 2660	2532	svchost.exe	36
PID 2532 wrote to memory of 2660	2532	svchost.exe	36
PID 2532 wrote to memory of 2660	2532	svchost.exe	36
PID 2532 wrote to memory of 2660	2532	svchost.exe	36
PID 2532 wrote to memory of 2660	2532	svchost.exe	36
PID 2532 wrote to memory of 2660	2532	svchost.exe	36
PID 2532 wrote to memory of 2660	2532	svchost.exe	36
PID 2532 wrote to memory of 2660	2532	svchost.exe	36

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\3103ebb8576654b0f3ef393bb5c860e93fb69ab8400e01295b25b0f244b34c61.exe
"C:\Users\Admin\AppData\Local\Temp\3103ebb8576654b0f3ef393bb5c860e93fb69ab8400e01295b25b0f244b34c61.exe"
1⤵
- Looks for VirtualBox Guest Additions in registry
- Looks for VMWare Tools registry key
- Checks BIOS information in registry
- Adds Run key to start application
- Maps connected drives based on registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1412
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2652
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"'
    3⤵
    - Creates scheduled task(s)
    PID:2920
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpB377.tmp.bat""
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:3024
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2476
- - C:\Users\Admin\AppData\Roaming\svchost.exe
    "C:\Users\Admin\AppData\Roaming\svchost.exe"
    3⤵
    - 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
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2532
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe"
      4⤵
      Suspicious use of SetWindowsHookEx
      PID:2660

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

Defense Evasion

Modify Registry

T1112

Virtualization/Sandbox Evasion

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

System Information Discovery

T1082

Virtualization/Sandbox Evasion