xworm | 9ee2b4dfcae8b6e7681dc6691ffd4dcfb521d061188b805e4c09f4151bbb9674

Reason

Machine shutdown

General

Target

XClient.exe
Size

67KB
MD5

51c54850a03f6858fe61e195110f33d9
SHA1

6e804a790b2b9a63f02d756a963fb76472d789cf
SHA256

9ee2b4dfcae8b6e7681dc6691ffd4dcfb521d061188b805e4c09f4151bbb9674
SHA512

642e969c5dc7165cf63dda7423ea42042878949909e860a73fabeb1bd9b2083fe026a705eb94be99fc68f691f4ca0a3ed820037afb2a35323e628b52941ec16c
SSDEEP

1536:60UL9WC16LIK6u/VO2kbP8cnnSVzS06H3OCIDO495:HULOLXA2kbP8MO/C495

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Attributes

Install_directory
%AppData%
install_file
Sihost.exe
pastebin_url
https://pastebin.com/raw/hA5YVNf1

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral1/memory/2816-1-0x0000000000AD0000-0x0000000000AE8000-memory.dmp	family_xworm

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

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

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

execution

PowerShell

T1059.001

pid	Process
2908	powershell.exe
2700	powershell.exe
1740	powershell.exe
1048	powershell.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Sihost.lnk	XClient.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Sihost.lnk	XClient.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-1-5-21-2872745919-2748461613-2989606286-1000\Software\Microsoft\Windows\CurrentVersion\Run\Sihost = "C:\\Users\\Admin\\AppData\\Roaming\\Sihost.exe"	XClient.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
4	pastebin.com
5	pastebin.com

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

System Information Discovery
T1082

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

T1053.005

pid	Process
2388	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2908	powershell.exe
2700	powershell.exe
1740	powershell.exe
1048	powershell.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	2816	XClient.exe
Token: SeDebugPrivilege	2908	powershell.exe
Token: SeDebugPrivilege	2700	powershell.exe
Token: SeDebugPrivilege	1740	powershell.exe
Token: SeDebugPrivilege	1048	powershell.exe
Token: SeDebugPrivilege	2816	XClient.exe
Token: SeShutdownPrivilege	2752	shutdown.exe
Token: SeRemoteShutdownPrivilege	2752	shutdown.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 2816 wrote to memory of 2908	2816	XClient.exe	30
PID 2816 wrote to memory of 2908	2816	XClient.exe	30
PID 2816 wrote to memory of 2908	2816	XClient.exe	30
PID 2816 wrote to memory of 2700	2816	XClient.exe	32
PID 2816 wrote to memory of 2700	2816	XClient.exe	32
PID 2816 wrote to memory of 2700	2816	XClient.exe	32
PID 2816 wrote to memory of 1740	2816	XClient.exe	34
PID 2816 wrote to memory of 1740	2816	XClient.exe	34
PID 2816 wrote to memory of 1740	2816	XClient.exe	34
PID 2816 wrote to memory of 1048	2816	XClient.exe	36
PID 2816 wrote to memory of 1048	2816	XClient.exe	36
PID 2816 wrote to memory of 1048	2816	XClient.exe	36
PID 2816 wrote to memory of 2388	2816	XClient.exe	38
PID 2816 wrote to memory of 2388	2816	XClient.exe	38
PID 2816 wrote to memory of 2388	2816	XClient.exe	38
PID 2816 wrote to memory of 2752	2816	XClient.exe	41
PID 2816 wrote to memory of 2752	2816	XClient.exe	41
PID 2816 wrote to memory of 2752	2816	XClient.exe	41

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:2816
- 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\XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2908
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2700
- 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\Roaming\Sihost.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1740
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Sihost.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1048
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Sihost" /tr "C:\Users\Admin\AppData\Roaming\Sihost.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2388
- C:\Windows\system32\shutdown.exe
  shutdown.exe /f /s /t 0
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2752

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x0
1⤵
PID:1728

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x1
1⤵
PID:2164

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
02488046ec40c20ad1fc8a65c2773e56

SHA1
b9acb08b03f2425235ff331433f6ed0dbdb3e17f

SHA256
0ff048d0938f25896ed7d688ab09adfebbe6b2251b7d6c6654e025efc569c1be

SHA512
d9ce62fea71a343a1d7c44d612b34f08690862be3f5295ccbe58d197a6f5f19ce8bd97f23214c3a54e6303a661fdb3d40254b5ab0ca3d0af5297be1820622924

Download Submit
memory/2700-14-0x000000001B500000-0x000000001B7E2000-memory.dmp

Filesize
2.9MB

Download
memory/2700-15-0x0000000002340000-0x0000000002348000-memory.dmp

Filesize
32KB

Download
memory/2816-0-0x000007FEF5433000-0x000007FEF5434000-memory.dmp

Filesize
4KB

Download
memory/2816-1-0x0000000000AD0000-0x0000000000AE8000-memory.dmp

Filesize
96KB

Download
memory/2816-32-0x000000001B310000-0x000000001B390000-memory.dmp

Filesize
512KB

Download
memory/2816-33-0x000007FEF5433000-0x000007FEF5434000-memory.dmp

Filesize
4KB

Download
memory/2816-34-0x000000001B310000-0x000000001B390000-memory.dmp

Filesize
512KB

Download
memory/2908-6-0x0000000002D40000-0x0000000002DC0000-memory.dmp

Filesize
512KB

Download
memory/2908-7-0x000000001B6B0000-0x000000001B992000-memory.dmp

Filesize
2.9MB

Download
memory/2908-8-0x0000000001F00000-0x0000000001F08000-memory.dmp

Filesize
32KB

Download

Analysis

Sharing

Errors

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads