xworm | b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

Processes:

b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe

Windows security bypass 2 TTPs 2 IoCs

Disable or Modify Tools

T1562.001

Modify Registry

Processes:

b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths	b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Local\Temp\b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe = "0"	b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm

Detects Windows executables referencing non-Windows User-Agents 1 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3060-18-0x0000000000400000-0x000000000040E000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA

Detects executables packed with or use KoiVM 1 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2744-4-0x0000020B74490000-0x0000020B744F0000-memory.dmp	INDICATOR_EXE_Packed_KoiVM

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs
Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.
execution

PowerShell
T1059.001

Processes:

powershell.exe

pid process

2908 powershell.exe

pid	process
2908	powershell.exe

Checks computer location settings 2 TTPs 1 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

Processes:

b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2539840389-1261165778-1087677076-1000\Control Panel\International\Geo\Nation	b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe

Windows security modification 2 TTPs 3 IoCs

Disable or Modify Tools

T1562.001

Modify Registry

Processes:

b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths	b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions	b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Local\Temp\b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe = "0"	b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

System Information Discovery

T1082

Processes:

b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe

description	pid	process	target process
PID 2744 set thread context of 3060	2744	b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe	CasPol.exe

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

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

powershell.exe

pid process

2908 powershell.exe
2908 powershell.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

powershell.exeCasPol.exe

description pid process

Token: SeDebugPrivilege 2908 powershell.exe
Token: SeDebugPrivilege 3060 CasPol.exe

pid	process
2908	powershell.exe
2908	powershell.exe

description	pid	process
Token: SeDebugPrivilege	2908	powershell.exe
Token: SeDebugPrivilege	3060	CasPol.exe

Suspicious use of WriteProcessMemory 13 IoCs

Processes:

b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe

description	pid	process	target process
PID 2744 wrote to memory of 2908	2744	b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe	powershell.exe
PID 2744 wrote to memory of 2908	2744	b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe	powershell.exe
PID 2744 wrote to memory of 3164	2744	b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe	regsvcs.exe
PID 2744 wrote to memory of 3164	2744	b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe	regsvcs.exe
PID 2744 wrote to memory of 3164	2744	b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe	regsvcs.exe
PID 2744 wrote to memory of 3060	2744	b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe	CasPol.exe
PID 2744 wrote to memory of 3060	2744	b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe	CasPol.exe
PID 2744 wrote to memory of 3060	2744	b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe	CasPol.exe
PID 2744 wrote to memory of 3060	2744	b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe	CasPol.exe
PID 2744 wrote to memory of 3060	2744	b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe	CasPol.exe
PID 2744 wrote to memory of 3060	2744	b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe	CasPol.exe
PID 2744 wrote to memory of 3060	2744	b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe	CasPol.exe
PID 2744 wrote to memory of 3060	2744	b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe	CasPol.exe

System policy modification 1 TTPs 1 IoCs

evasion

Modify Registry

Processes:

b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe

C:\Users\Admin\AppData\Local\Temp\b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe
"C:\Users\Admin\AppData\Local\Temp\b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe"
1⤵
- UAC bypass
- Windows security bypass
- Checks computer location settings
- Windows security modification
- Checks whether UAC is enabled
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
- System policy modification
PID:2744
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\b542502918e537abff66105f9432f29e6d8ba7d4169b7d2894dd9ed3261e0141.exe" -Force
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2908
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\regsvcs.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\regsvcs.exe"
  2⤵
  PID:3164
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\CasPol.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\CasPol.exe"
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3060

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

3

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

Query Registry