xworm | 41ac04f717912442f57958f140f4e7da4f09a2866b01d7f6bae75f94fa4c96e6

General

Target

XClient2.exe
Size

72KB
MD5

40663a80e6470891d3c983b7143f460f
SHA1

d41411214e04ea17eac12174abac3d746c01b59e
SHA256

41ac04f717912442f57958f140f4e7da4f09a2866b01d7f6bae75f94fa4c96e6
SHA512

069a3bd3f786ba22d3502ad4d4117f7abfe3e8ee6c4c35518b6398efdb8bcab00a0ba4d493d8d6670a4ba7185d727c631ee2349744ae127138801509a42f339d
SSDEEP

1536:JMIahO8dQiGSmttjQR8YRZZbMgA/omS8W5XZF6KdSyuDbkOBjnBn:7OdQnthQRPZbMgA/fIZZdSyusOBVn

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

3.1

C2

http://127.0.0.1:4040

Attributes

Install_directory
%Temp%
install_file
USB.exe

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral1/memory/2420-1-0x0000000000DA0000-0x0000000000DB8000-memory.dmp	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat 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
2992	powershell.exe
2880	powershell.exe
2868	powershell.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\XClient2.lnk	XClient2.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\XClient2.lnk	XClient2.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-1-5-21-2958949473-3205530200-1453100116-1000\Software\Microsoft\Windows\CurrentVersion\Run\XClient2 = "C:\\Users\\Admin\\AppData\\Local\\Temp\\XClient2.exe"	XClient2.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

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
1656	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2992	powershell.exe
2880	powershell.exe
2868	powershell.exe
2420	XClient2.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	2420	XClient2.exe
Token: SeDebugPrivilege	2992	powershell.exe
Token: SeDebugPrivilege	2880	powershell.exe
Token: SeDebugPrivilege	2868	powershell.exe
Token: SeDebugPrivilege	2420	XClient2.exe
Token: SeDebugPrivilege	304	XClient2.exe
Token: SeDebugPrivilege	2280	XClient2.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2420	XClient2.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 2420 wrote to memory of 2992	2420	XClient2.exe	32
PID 2420 wrote to memory of 2992	2420	XClient2.exe	32
PID 2420 wrote to memory of 2992	2420	XClient2.exe	32
PID 2420 wrote to memory of 2880	2420	XClient2.exe	34
PID 2420 wrote to memory of 2880	2420	XClient2.exe	34
PID 2420 wrote to memory of 2880	2420	XClient2.exe	34
PID 2420 wrote to memory of 2868	2420	XClient2.exe	36
PID 2420 wrote to memory of 2868	2420	XClient2.exe	36
PID 2420 wrote to memory of 2868	2420	XClient2.exe	36
PID 2420 wrote to memory of 1656	2420	XClient2.exe	38
PID 2420 wrote to memory of 1656	2420	XClient2.exe	38
PID 2420 wrote to memory of 1656	2420	XClient2.exe	38
PID 1084 wrote to memory of 304	1084	taskeng.exe	41
PID 1084 wrote to memory of 304	1084	taskeng.exe	41
PID 1084 wrote to memory of 304	1084	taskeng.exe	41
PID 1084 wrote to memory of 2280	1084	taskeng.exe	42
PID 1084 wrote to memory of 2280	1084	taskeng.exe	42
PID 1084 wrote to memory of 2280	1084	taskeng.exe	42

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\XClient2.exe
"C:\Users\Admin\AppData\Local\Temp\XClient2.exe"
1⤵
- Drops startup file
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2420
- 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\XClient2.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2992
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'XClient2.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2880
- 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\XClient2.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2868
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "XClient2" /tr "C:\Users\Admin\AppData\Local\Temp\XClient2.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1656

C:\Windows\system32\taskeng.exe
taskeng.exe {5838AB17-D5DF-4324-9B93-DDF1CBF75A08} S-1-5-21-2958949473-3205530200-1453100116-1000:WHMFPZKA\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:1084
- C:\Users\Admin\AppData\Local\Temp\XClient2.exe
  C:\Users\Admin\AppData\Local\Temp\XClient2.exe
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:304
- C:\Users\Admin\AppData\Local\Temp\XClient2.exe
  C:\Users\Admin\AppData\Local\Temp\XClient2.exe
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2280

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

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
7KB

MD5
051776a0f4d7faf21238fffb9a95b0bb

SHA1
8a1d1115f927d73f0192b9a73f9159f630bb3446

SHA256
2f8f8feea3b061c7c1731d5084f3270bbd40976061e0fb3bc0925c1b2982e202

SHA512
727d70ce7e424ac1664c2dc0cc430248bf8ad933d6c30746bdf7c715966ff95be6ed8fdcf1b3292733a5955c3613c1a0c0c1a853f47a4c163cc1b69015be5af1

Download Submit
memory/2420-0-0x000007FEF5A63000-0x000007FEF5A64000-memory.dmp

Filesize
4KB

Download
memory/2420-1-0x0000000000DA0000-0x0000000000DB8000-memory.dmp

Filesize
96KB

Download
memory/2420-2-0x000007FEF5A60000-0x000007FEF644C000-memory.dmp

Filesize
9.9MB

Download
memory/2420-23-0x000007FEF5A63000-0x000007FEF5A64000-memory.dmp

Filesize
4KB

Download
memory/2420-24-0x000007FEF5A60000-0x000007FEF644C000-memory.dmp

Filesize
9.9MB

Download
memory/2880-15-0x000000001B470000-0x000000001B752000-memory.dmp

Filesize
2.9MB

Download
memory/2880-16-0x0000000001DA0000-0x0000000001DA8000-memory.dmp

Filesize
32KB

Download
memory/2992-7-0x0000000002D50000-0x0000000002DD0000-memory.dmp

Filesize
512KB

Download
memory/2992-8-0x000000001B670000-0x000000001B952000-memory.dmp

Filesize
2.9MB

Download
memory/2992-9-0x0000000001E60000-0x0000000001E68000-memory.dmp

Filesize
32KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads