xworm | cd9afdef9b69b501d2767b70792a481f1c768ba3585a53de167703fe250ab2b4

Bypass User Account Control

T1548.002

Disable or Modify Tools

Modify Registry

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

Windows security bypass 2 TTPs 2 IoCs

Disable or Modify Tools

Modify Registry

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

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

Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
1176	powershell.exe
4564	powershell.exe
3240	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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3227495264-2217614367-4027411560-1000\Control Panel\International\Geo\Nation	XBASS.exe

Windows security modification 2 TTPs 3 IoCs

Disable or Modify Tools

Modify Registry

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

Checks whether UAC is enabled 1 TTPs 2 IoCs

System Information Discovery

T1082

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

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2040 set thread context of 2836	2040	XBASS.exe	89

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 3 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	msbuild.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
1176	powershell.exe
1176	powershell.exe
4564	powershell.exe
4564	powershell.exe
4564	powershell.exe
3240	powershell.exe
3240	powershell.exe
3240	powershell.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	2040	XBASS.exe
Token: SeDebugPrivilege	1176	powershell.exe
Token: SeDebugPrivilege	2836	msbuild.exe
Token: SeDebugPrivilege	4564	powershell.exe
Token: SeDebugPrivilege	3240	powershell.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 2040 wrote to memory of 1176	2040	XBASS.exe	85
PID 2040 wrote to memory of 1176	2040	XBASS.exe	85
PID 2040 wrote to memory of 3784	2040	XBASS.exe	87
PID 2040 wrote to memory of 3784	2040	XBASS.exe	87
PID 2040 wrote to memory of 3784	2040	XBASS.exe	87
PID 2040 wrote to memory of 4004	2040	XBASS.exe	88
PID 2040 wrote to memory of 4004	2040	XBASS.exe	88
PID 2040 wrote to memory of 4004	2040	XBASS.exe	88
PID 2040 wrote to memory of 2836	2040	XBASS.exe	89
PID 2040 wrote to memory of 2836	2040	XBASS.exe	89
PID 2040 wrote to memory of 2836	2040	XBASS.exe	89
PID 2040 wrote to memory of 2836	2040	XBASS.exe	89
PID 2040 wrote to memory of 2836	2040	XBASS.exe	89
PID 2040 wrote to memory of 2836	2040	XBASS.exe	89
PID 2040 wrote to memory of 2836	2040	XBASS.exe	89
PID 2040 wrote to memory of 2836	2040	XBASS.exe	89
PID 2040 wrote to memory of 208	2040	XBASS.exe	90
PID 2040 wrote to memory of 208	2040	XBASS.exe	90
PID 2040 wrote to memory of 208	2040	XBASS.exe	90
PID 2836 wrote to memory of 4564	2836	msbuild.exe	101
PID 2836 wrote to memory of 4564	2836	msbuild.exe	101
PID 2836 wrote to memory of 4564	2836	msbuild.exe	101
PID 2836 wrote to memory of 3240	2836	msbuild.exe	104
PID 2836 wrote to memory of 3240	2836	msbuild.exe	104
PID 2836 wrote to memory of 3240	2836	msbuild.exe	104

System policy modification 1 TTPs 1 IoCs

evasion

Modify Registry

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

C:\Users\Admin\AppData\Local\Temp\XBASS.exe
"C:\Users\Admin\AppData\Local\Temp\XBASS.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 AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:2040
- 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\XBASS.exe" -Force
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1176
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe"
  2⤵
  PID:3784
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe"
  2⤵
  PID:4004
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2836
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4564
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'msbuild.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3240
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe"
  2⤵
  PID:208

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

T1562

Disable or Modify Tools

Modify Registry