xworm | a951eabf7b26db4a04b2c46c96015b4b53cb10d8ddd1ad1fe7bb16aa12969843

System Information Discovery

persistence privilege_escalation

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	XWormClient.exe

Creates a file in the Startup directory 1 TTPs 2 IoCs

A file was written to a Windows startup folder. Files in these directories are executed automatically when a user logs on or an application initializes.

Registry Run Keys / Startup Folder

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\XWormClient.lnk	XWormClient.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\XWormClient.lnk	XWormClient.exe

Executes dropped EXE 3 IoCs

pid	Process
4844	XWormClient.exe
2456	XWormClient.exe
4828	XWormClient.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\XWormClient = "C:\\Users\\Admin\\AppData\\Local\\XWormClient.exe"	XWormClient.exe

Looks up external IP address via web service 1 TTPs 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

discovery

Internet Connection Discovery

T1016.001

flow	ioc
6	ip-api.com

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

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

System Information Discovery

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	XWormClient.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	XWormClient.exe

Enumerates system info in registry 2 TTPs 4 IoCs

Query Registry

System Information Discovery

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS	XWormClient.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\BIOSVersion	XWormClient.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\BIOSReleaseDate	XWormClient.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemProductName	XWormClient.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

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

persistence execution

Scheduled Task

pid	Process
5076	schtasks.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

pid	Process
536	powershell.exe
536	powershell.exe
2272	powershell.exe
2272	powershell.exe
316	powershell.exe
316	powershell.exe
2824	powershell.exe
2824	powershell.exe
1100	XWormClient.exe
2452	powershell.exe
2452	powershell.exe
1180	powershell.exe
1180	powershell.exe
1100	XWormClient.exe

Suspicious use of AdjustPrivilegeToken 11 IoCs

description	pid	Process
Token: SeDebugPrivilege	1100	XWormClient.exe
Token: SeDebugPrivilege	536	powershell.exe
Token: SeDebugPrivilege	2272	powershell.exe
Token: SeDebugPrivilege	316	powershell.exe
Token: SeDebugPrivilege	2824	powershell.exe
Token: SeDebugPrivilege	1100	XWormClient.exe
Token: SeDebugPrivilege	4844	XWormClient.exe
Token: SeDebugPrivilege	2456	XWormClient.exe
Token: SeDebugPrivilege	4828	XWormClient.exe
Token: SeDebugPrivilege	2452	powershell.exe
Token: SeDebugPrivilege	1180	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1100	XWormClient.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1100 wrote to memory of 536	1100	XWormClient.exe	88
PID 1100 wrote to memory of 2272	1100	XWormClient.exe	90
PID 1100 wrote to memory of 316	1100	XWormClient.exe	92
PID 1100 wrote to memory of 2824	1100	XWormClient.exe	94
PID 1100 wrote to memory of 5076	1100	XWormClient.exe	99
PID 1100 wrote to memory of 2452	1100	XWormClient.exe	110
PID 2452 wrote to memory of 1180	2452	powershell.exe	112
PID 1100 wrote to memory of 2824	1100	XWormClient.exe	114
PID 2824 wrote to memory of 4424	2824	csc.exe	116

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\XWormClient.exe
"C:\Users\Admin\AppData\Local\Temp\XWormClient.exe"
1⤵
- Checks computer location settings
- Creates a file in the Startup directory
- Adds Run key to start application
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1100
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\XWormClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:536
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'XWormClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2272
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\XWormClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:316
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'XWormClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2824
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "XWormClient" /tr "C:\Users\Admin\AppData\Local\XWormClient.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:5076
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  powershell -WindowStyle Hidden -EncodedCommand UwB0AGEAcgB0AC0AUAByAG8AYwBlAHMAcwAgAHAAbwB3AGUAcgBzAGgAZQBsAGwAIAAtAEEAcgBnAHUAbQBlAG4AdABMAGkAcwB0ACAAJwAtAE4AbwBQAHIAbwBmAGkAbABlACAALQBDAG8AbQBtAGEAbgBkACAAQQBkAGQALQBNAHAAUAByAGUAZgBlAHIAZQBuAGMAZQAgAC0ARQB4AGMAbAB1AHMAaQBvAG4AUABhAHQAaAAgACgAJABlAG4AdgA6AFMAeQBzAHQAZQBtAEQAcgBpAHYAZQAgACsAIAAnACcAXAAnACcAKQAnACAALQBWAGUAcgBiACAAUgB1AG4AQQBzACAALQBXAGkAbgBkAG8AdwBTAHQAeQBsAGUAIABIAGkAZABkAGUAbgA=
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2452
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -NoProfile -Command Add-MpPreference -ExclusionPath ($env:SystemDrive + '\')
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1180
- C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe
  "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /target:exe /out:"C:\Users\Admin\AppData\Local\Temp\XWormClient.exe" "C:\Users\Admin\AppData\Local\Temp\guardian_src_331a7e74a4a14b1f81e9fef00396cfca.cs"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2824
- - C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe
    C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RES6B3E.tmp" "c:\Users\Admin\AppData\Local\Temp\CSCBF01B9FF8C944E4FA27D59479EC7A3D7.TMP"
    3⤵
    PID:4424

C:\Users\Admin\AppData\Local\XWormClient.exe
C:\Users\Admin\AppData\Local\XWormClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4844

C:\Users\Admin\AppData\Local\XWormClient.exe
C:\Users\Admin\AppData\Local\XWormClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2456

C:\Users\Admin\AppData\Local\XWormClient.exe
C:\Users\Admin\AppData\Local\XWormClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4828

Network

MITRE ATT&CK Enterprise v16

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

Scheduled Task/Job

T1053

Scheduled Task

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

Scheduled Task/Job

T1053

Scheduled Task

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

System Information Discovery