xworm | b0df6f7ff34f3a228bd4c85300103f78c2de909876bda06726528265df8439dd

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\Windows\\system32\\userinit.exe,, C:\\Users\\Admin\\AppData\\Local\\Temp\\ubiwtk.exe"	ubiwtk.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\Windows\\system32\\userinit.exe,"	ubiwtk.exe

UAC bypass 3 TTPs 2 IoCs

evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	ubiwtk.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "1"	ubiwtk.exe

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

Boot or Logon Autostart Execution: Active Setup 2 TTPs 1 IoCs

Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

persistence

Active Setup

T1547.014

Modify Registry

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000\Software\Microsoft\Active Setup\Installed Components	explorer.exe

Disables RegEdit via registry modification 1 IoCs

evasion

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000\Software\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	ubiwtk.exe

Disables Task Manager via registry modification
evasion

Drops startup file 2 IoCs

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

Executes dropped EXE 3 IoCs

pid	Process
1896	XClient.exe
1612	XClient.exe
2940	ubiwtk.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000\Software\Microsoft\Windows\CurrentVersion\Run\XClient = "C:\\Users\\Admin\\AppData\\Roaming\\XClient.exe"	XClient.exe

Checks whether UAC is enabled 1 TTPs 3 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	ubiwtk.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	ubiwtk.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "1"	ubiwtk.exe

Looks up external IP address via web service 1 IoCs

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

flow	ioc
4	ip-api.com

Sets desktop wallpaper using registry 2 TTPs 1 IoCs

ransomware

Defacement

T1491

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000\Control Panel\Desktop\Wallpaper	ubiwtk.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 4 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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	taskkill.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	taskkill.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ubiwtk.exe

Kills process with taskkill 2 IoCs

evasion

pid	Process
1100	taskkill.exe
1660	taskkill.exe

Modifies registry class 5 IoCs

description	ioc	Process
Set value (data)	\REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\NodeSlots	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\MRUListEx = ffffffff	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000_Classes\Local Settings	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU	explorer.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
2528	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2940	ubiwtk.exe

Suspicious use of AdjustPrivilegeToken 15 IoCs

description	pid	Process
Token: SeDebugPrivilege	2724	XClient.exe
Token: SeDebugPrivilege	2724	XClient.exe
Token: SeDebugPrivilege	1896	XClient.exe
Token: SeDebugPrivilege	1612	XClient.exe
Token: SeDebugPrivilege	2940	ubiwtk.exe
Token: SeDebugPrivilege	1100	taskkill.exe
Token: SeDebugPrivilege	1660	taskkill.exe
Token: SeShutdownPrivilege	1964	explorer.exe
Token: SeShutdownPrivilege	1964	explorer.exe
Token: SeShutdownPrivilege	1964	explorer.exe
Token: SeShutdownPrivilege	1964	explorer.exe
Token: SeShutdownPrivilege	1964	explorer.exe
Token: SeShutdownPrivilege	1964	explorer.exe
Token: SeShutdownPrivilege	1964	explorer.exe
Token: SeShutdownPrivilege	1964	explorer.exe

Suspicious use of FindShellTrayWindow 8 IoCs

pid	Process
2940	ubiwtk.exe
2940	ubiwtk.exe
1964	explorer.exe
1964	explorer.exe
1964	explorer.exe
1964	explorer.exe
1964	explorer.exe
1964	explorer.exe

Suspicious use of SendNotifyMessage 3 IoCs

pid	Process
1964	explorer.exe
1964	explorer.exe
1964	explorer.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2940	ubiwtk.exe

Suspicious use of WriteProcessMemory 29 IoCs

description	pid	Process	procid_target
PID 2724 wrote to memory of 2528	2724	XClient.exe	31
PID 2724 wrote to memory of 2528	2724	XClient.exe	31
PID 2724 wrote to memory of 2528	2724	XClient.exe	31
PID 3000 wrote to memory of 1896	3000	taskeng.exe	34
PID 3000 wrote to memory of 1896	3000	taskeng.exe	34
PID 3000 wrote to memory of 1896	3000	taskeng.exe	34
PID 3000 wrote to memory of 1612	3000	taskeng.exe	36
PID 3000 wrote to memory of 1612	3000	taskeng.exe	36
PID 3000 wrote to memory of 1612	3000	taskeng.exe	36
PID 2724 wrote to memory of 2940	2724	XClient.exe	37
PID 2724 wrote to memory of 2940	2724	XClient.exe	37
PID 2724 wrote to memory of 2940	2724	XClient.exe	37
PID 2724 wrote to memory of 2940	2724	XClient.exe	37
PID 2940 wrote to memory of 236	2940	ubiwtk.exe	38
PID 2940 wrote to memory of 236	2940	ubiwtk.exe	38
PID 2940 wrote to memory of 236	2940	ubiwtk.exe	38
PID 2940 wrote to memory of 236	2940	ubiwtk.exe	38
PID 236 wrote to memory of 1100	236	cmd.exe	40
PID 236 wrote to memory of 1100	236	cmd.exe	40
PID 236 wrote to memory of 1100	236	cmd.exe	40
PID 236 wrote to memory of 1100	236	cmd.exe	40
PID 236 wrote to memory of 1660	236	cmd.exe	41
PID 236 wrote to memory of 1660	236	cmd.exe	41
PID 236 wrote to memory of 1660	236	cmd.exe	41
PID 236 wrote to memory of 1660	236	cmd.exe	41
PID 2940 wrote to memory of 1964	2940	ubiwtk.exe	42
PID 2940 wrote to memory of 1964	2940	ubiwtk.exe	42
PID 2940 wrote to memory of 1964	2940	ubiwtk.exe	42
PID 2940 wrote to memory of 1964	2940	ubiwtk.exe	42

System policy modification 1 TTPs 4 IoCs

evasion

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	ubiwtk.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoViewContextMenu = "1"	ubiwtk.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoClose = "1"	ubiwtk.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "1"	ubiwtk.exe

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\XClient.exe
"C:\Users\Admin\AppData\Local\Temp\XClient.exe"
1⤵
- Drops startup file
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2724
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "XClient" /tr "C:\Users\Admin\AppData\Roaming\XClient.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2528
- C:\Users\Admin\AppData\Local\Temp\ubiwtk.exe
  "C:\Users\Admin\AppData\Local\Temp\ubiwtk.exe"
  2⤵
  - Modifies WinLogon for persistence
  - UAC bypass
  - Disables RegEdit via registry modification
  - Executes dropped EXE
  - Checks whether UAC is enabled
  - Sets desktop wallpaper using registry
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  - System policy modification
  PID:2940
- - C:\Windows\SysWOW64\cmd.exe
    "cmd.exe" /c taskkill /f /im explorer.exe & taskkill /f /im taskmgr.exe
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:236
  - - C:\Windows\SysWOW64\taskkill.exe
      taskkill /f /im explorer.exe
      4⤵
      System Location Discovery: System Language Discovery
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:1100
  - - C:\Windows\SysWOW64\taskkill.exe
      taskkill /f /im taskmgr.exe
      4⤵
      System Location Discovery: System Language Discovery
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:1660
- - C:\Windows\explorer.exe
    "C:\Windows\explorer.exe"
    3⤵
    - Boot or Logon Autostart Execution: Active Setup
    - Modifies registry class
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of FindShellTrayWindow
    - Suspicious use of SendNotifyMessage
    PID:1964
- - C:\Windows\SysWOW64\cmd.exe
    "cmd.exe" /c shutdown /r /t 0
    3⤵
    PID:1884
  - - C:\Windows\SysWOW64\shutdown.exe
      shutdown /r /t 0
      4⤵
      PID:2900

C:\Windows\system32\taskeng.exe
taskeng.exe {C89F6FD9-9C48-4A8D-9805-555F80A55C96} S-1-5-21-2872745919-2748461613-2989606286-1000:CCJBVTGQ\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:3000
- C:\Users\Admin\AppData\Roaming\XClient.exe
  C:\Users\Admin\AppData\Roaming\XClient.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1896
- C:\Users\Admin\AppData\Roaming\XClient.exe
  C:\Users\Admin\AppData\Roaming\XClient.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1612

C:\Windows\system32\AUDIODG.EXE
C:\Windows\system32\AUDIODG.EXE 0x1d8
1⤵
PID:2272

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x0
1⤵
PID:1608

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x1
1⤵
PID:3048

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

Persistence

Boot or Logon Autostart Execution

3

T1547

Active Setup

T1547.014

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Scheduled Task/Job

T1053

Scheduled Task

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Boot or Logon Autostart Execution

3

T1547

Active Setup

T1547.014

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Scheduled Task/Job

T1053

Scheduled Task

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

2

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Defacement