xworm | 6bde76de6064f5cb941da866a26b81f18d4a7e3d738d416238fa73c0b01149a7

General

Target

XClient.exe
Size

41KB
MD5

f065a5f352973e89b2e8d3efd79b98f8
SHA1

6a9a84e0a11010262ea35790fcdf824193805c76
SHA256

7b75950ae4eeabfdedafe9e3b14acee160a6ad932cbad66f71fe5bca32cc6405
SHA512

b920e46653ec87748767e71e88593db3c6d25fcde1b63504a1718d438e383c15578fd9e5bae5665b040e0f3512566ec99322eb8f3b5a0fa2112934ad486a2006
SSDEEP

768:2+ibOPCt0LxOg3XvgggzLJF5PG9pmE6vOwhF3EizW:2tbuCiL0WXvvgpFI9AE6vOwjF6

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

5.0

C2

127.0.0.1:7000

Mutex

JYj1EIwWwj45bGVr

Attributes

Install_directory
%AppData%
install_file
XClient.exe

aes.plain

Signatures

Detect Xworm Payload 4 IoCs

resource	yara_rule
behavioral1/memory/2368-1-0x00000000002A0000-0x00000000002B0000-memory.dmp	family_xworm
behavioral1/files/0x000b000000015d66-35.dat	family_xworm
behavioral1/memory/3016-37-0x0000000000100000-0x0000000000110000-memory.dmp	family_xworm
behavioral1/memory/956-40-0x0000000000A90000-0x0000000000AA0000-memory.dmp	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat 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
1552	powershell.exe
2212	powershell.exe
2736	powershell.exe
2720	powershell.exe

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 2 IoCs

pid	Process
3016	XClient.exe
956	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-1-5-21-3551809350-4263495960-1443967649-1000\Software\Microsoft\Windows\CurrentVersion\Run\XClient = "C:\\Users\\Admin\\AppData\\Roaming\\XClient.exe"	XClient.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
1352	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
1552	powershell.exe
2212	powershell.exe
2736	powershell.exe
2720	powershell.exe
2368	XClient.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	2368	XClient.exe
Token: SeDebugPrivilege	1552	powershell.exe
Token: SeDebugPrivilege	2212	powershell.exe
Token: SeDebugPrivilege	2736	powershell.exe
Token: SeDebugPrivilege	2720	powershell.exe
Token: SeDebugPrivilege	2368	XClient.exe
Token: SeDebugPrivilege	3016	XClient.exe
Token: SeDebugPrivilege	956	XClient.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2368	XClient.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 2368 wrote to memory of 1552	2368	XClient.exe	32
PID 2368 wrote to memory of 1552	2368	XClient.exe	32
PID 2368 wrote to memory of 1552	2368	XClient.exe	32
PID 2368 wrote to memory of 2212	2368	XClient.exe	34
PID 2368 wrote to memory of 2212	2368	XClient.exe	34
PID 2368 wrote to memory of 2212	2368	XClient.exe	34
PID 2368 wrote to memory of 2736	2368	XClient.exe	36
PID 2368 wrote to memory of 2736	2368	XClient.exe	36
PID 2368 wrote to memory of 2736	2368	XClient.exe	36
PID 2368 wrote to memory of 2720	2368	XClient.exe	38
PID 2368 wrote to memory of 2720	2368	XClient.exe	38
PID 2368 wrote to memory of 2720	2368	XClient.exe	38
PID 2368 wrote to memory of 1352	2368	XClient.exe	40
PID 2368 wrote to memory of 1352	2368	XClient.exe	40
PID 2368 wrote to memory of 1352	2368	XClient.exe	40
PID 1868 wrote to memory of 3016	1868	taskeng.exe	43
PID 1868 wrote to memory of 3016	1868	taskeng.exe	43
PID 1868 wrote to memory of 3016	1868	taskeng.exe	43
PID 1868 wrote to memory of 956	1868	taskeng.exe	44
PID 1868 wrote to memory of 956	1868	taskeng.exe	44
PID 1868 wrote to memory of 956	1868	taskeng.exe	44

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 behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2368
- 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:1552
- 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:2212
- 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\XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2736
- 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:2720
- 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:1352

C:\Windows\system32\taskeng.exe
taskeng.exe {9B08B35C-5F48-4381-BBEB-1DEB5BA5082A} S-1-5-21-3551809350-4263495960-1443967649-1000:NNYJZAHP\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:1868
- C:\Users\Admin\AppData\Roaming\XClient.exe
  C:\Users\Admin\AppData\Roaming\XClient.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:3016
- C:\Users\Admin\AppData\Roaming\XClient.exe
  C:\Users\Admin\AppData\Roaming\XClient.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:956

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

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Downloads

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

Filesize
7KB

MD5
4a60842283e8723b52cc24d3db0b5af8

SHA1
66dc281f871eaf7ae0feef925b3718156cfee88c

SHA256
dd6671b80de5f8bec1c368cc828eb9b759b671b9153efcee59598597abb532ce

SHA512
ef73438579d941b896a225279e89a849ecf38b5c9e058ab22a2dd5399e99377ed8a6e2a7cbdefc3d7edb60d2169c0f3ab5fef305a6d98fc8572bcf5d3db47f0b

Download Submit
C:\Users\Admin\AppData\Roaming\XClient.exe

Filesize
41KB

MD5
f065a5f352973e89b2e8d3efd79b98f8

SHA1
6a9a84e0a11010262ea35790fcdf824193805c76

SHA256
7b75950ae4eeabfdedafe9e3b14acee160a6ad932cbad66f71fe5bca32cc6405

SHA512
b920e46653ec87748767e71e88593db3c6d25fcde1b63504a1718d438e383c15578fd9e5bae5665b040e0f3512566ec99322eb8f3b5a0fa2112934ad486a2006

Download Submit
memory/956-40-0x0000000000A90000-0x0000000000AA0000-memory.dmp

Filesize
64KB

Download
memory/1552-7-0x00000000028B0000-0x0000000002930000-memory.dmp

Filesize
512KB

Download
memory/1552-8-0x000000001B5F0000-0x000000001B8D2000-memory.dmp

Filesize
2.9MB

Download
memory/1552-9-0x00000000028A0000-0x00000000028A8000-memory.dmp

Filesize
32KB

Download
memory/2212-15-0x000000001B680000-0x000000001B962000-memory.dmp

Filesize
2.9MB

Download
memory/2212-16-0x0000000002620000-0x0000000002628000-memory.dmp

Filesize
32KB

Download
memory/2368-2-0x000007FEF6340000-0x000007FEF6D2C000-memory.dmp

Filesize
9.9MB

Download
memory/2368-0-0x000007FEF6343000-0x000007FEF6344000-memory.dmp

Filesize
4KB

Download
memory/2368-32-0x000007FEF6343000-0x000007FEF6344000-memory.dmp

Filesize
4KB

Download
memory/2368-33-0x000007FEF6340000-0x000007FEF6D2C000-memory.dmp

Filesize
9.9MB

Download
memory/2368-1-0x00000000002A0000-0x00000000002B0000-memory.dmp

Filesize
64KB

Download
memory/3016-37-0x0000000000100000-0x0000000000110000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads