xworm | 4da3bf8fbe28b89c7bbfe4c0ef6cebaf7be4505d00d97c6f452fbe1dca76e5c9

General

Target

XClient.exe
Size

42KB
MD5

d050f2d0dc9d5164b947691216f38718
SHA1

9934fd9007bfdd2c1bb01287ee1faaedc4d1451b
SHA256

4da3bf8fbe28b89c7bbfe4c0ef6cebaf7be4505d00d97c6f452fbe1dca76e5c9
SHA512

f435373c1baed0a5377b86a62b373f2c2c4ce8d95fbd3e82b9de6503f566c5149c2644b7a19e05004f8714736de15fa71a801483b2129bc67ea47508eee4c469
SSDEEP

768:F5sWQjOZCn30H3oJeYhkS3xFPw9BYO6rOphSPuUno6:F5sWZZCEYhzBFY9SO6rOpUBo6

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

5.0

C2

music-challenges.gl.at.ply.gg:12929

Mutex

XKCa4jg1HAhWF9ov

Attributes

Install_directory
%AppData%
install_file
SubDir.exe

aes.plain

Signatures

Detect Xworm Payload 3 IoCs

resource	yara_rule
behavioral1/memory/1944-1-0x0000000001220000-0x0000000001230000-memory.dmp	family_xworm
behavioral1/files/0x000e000000012254-36.dat	family_xworm
behavioral1/memory/1800-38-0x0000000001320000-0x0000000001330000-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
2904	powershell.exe
2680	powershell.exe
2756	powershell.exe
2992	powershell.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 2 IoCs

pid	Process
1800	SubDir.exe
2024	SubDir.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-1-5-21-312935884-697965778-3955649944-1000\Software\Microsoft\Windows\CurrentVersion\Run\SubDir = "C:\\Users\\Admin\\AppData\\Roaming\\SubDir.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
1028	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2756	powershell.exe
2992	powershell.exe
2904	powershell.exe
2680	powershell.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	1944	XClient.exe
Token: SeDebugPrivilege	2756	powershell.exe
Token: SeDebugPrivilege	2992	powershell.exe
Token: SeDebugPrivilege	2904	powershell.exe
Token: SeDebugPrivilege	2680	powershell.exe
Token: SeDebugPrivilege	1944	XClient.exe
Token: SeDebugPrivilege	1800	SubDir.exe
Token: SeDebugPrivilege	2024	SubDir.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 1944 wrote to memory of 2756	1944	XClient.exe	31
PID 1944 wrote to memory of 2756	1944	XClient.exe	31
PID 1944 wrote to memory of 2756	1944	XClient.exe	31
PID 1944 wrote to memory of 2992	1944	XClient.exe	33
PID 1944 wrote to memory of 2992	1944	XClient.exe	33
PID 1944 wrote to memory of 2992	1944	XClient.exe	33
PID 1944 wrote to memory of 2904	1944	XClient.exe	35
PID 1944 wrote to memory of 2904	1944	XClient.exe	35
PID 1944 wrote to memory of 2904	1944	XClient.exe	35
PID 1944 wrote to memory of 2680	1944	XClient.exe	37
PID 1944 wrote to memory of 2680	1944	XClient.exe	37
PID 1944 wrote to memory of 2680	1944	XClient.exe	37
PID 1944 wrote to memory of 1028	1944	XClient.exe	39
PID 1944 wrote to memory of 1028	1944	XClient.exe	39
PID 1944 wrote to memory of 1028	1944	XClient.exe	39
PID 2368 wrote to memory of 1800	2368	taskeng.exe	43
PID 2368 wrote to memory of 1800	2368	taskeng.exe	43
PID 2368 wrote to memory of 1800	2368	taskeng.exe	43
PID 2368 wrote to memory of 2024	2368	taskeng.exe	44
PID 2368 wrote to memory of 2024	2368	taskeng.exe	44
PID 2368 wrote to memory of 2024	2368	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 use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1944
- 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:2756
- 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:2992
- 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\SubDir.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2904
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'SubDir.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2680
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "SubDir" /tr "C:\Users\Admin\AppData\Roaming\SubDir.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1028

C:\Windows\system32\taskeng.exe
taskeng.exe {BF948901-67A8-4E83-A88D-A1B5309F8675} S-1-5-21-312935884-697965778-3955649944-1000:MXQFNXLT\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2368
- C:\Users\Admin\AppData\Roaming\SubDir.exe
  C:\Users\Admin\AppData\Roaming\SubDir.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1800
- C:\Users\Admin\AppData\Roaming\SubDir.exe
  C:\Users\Admin\AppData\Roaming\SubDir.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2024

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
cacff50e1e857bfd20c01c24fbf57179

SHA1
7c2aa049399b9ffa83db621c6020f805f1aa6c90

SHA256
587cafe3c183ea30dd067ce9b636fe17e2308eafea35fe16ecf6cf219177fca4

SHA512
c3bbcbd1ebd457171d0bb237f13ca089881821b83aa936b05061da87a15c3e4686a4ad30e243312635b142c089dbd916fe42346c161353c5183d278c61d7ed0c

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

Filesize
42KB

MD5
d050f2d0dc9d5164b947691216f38718

SHA1
9934fd9007bfdd2c1bb01287ee1faaedc4d1451b

SHA256
4da3bf8fbe28b89c7bbfe4c0ef6cebaf7be4505d00d97c6f452fbe1dca76e5c9

SHA512
f435373c1baed0a5377b86a62b373f2c2c4ce8d95fbd3e82b9de6503f566c5149c2644b7a19e05004f8714736de15fa71a801483b2129bc67ea47508eee4c469

Download Submit
memory/1800-38-0x0000000001320000-0x0000000001330000-memory.dmp

Filesize
64KB

Download
memory/1944-2-0x000007FEF5E10000-0x000007FEF67FC000-memory.dmp

Filesize
9.9MB

Download
memory/1944-0-0x000007FEF5E13000-0x000007FEF5E14000-memory.dmp

Filesize
4KB

Download
memory/1944-28-0x000007FEF5E13000-0x000007FEF5E14000-memory.dmp

Filesize
4KB

Download
memory/1944-34-0x000007FEF5E10000-0x000007FEF67FC000-memory.dmp

Filesize
9.9MB

Download
memory/1944-1-0x0000000001220000-0x0000000001230000-memory.dmp

Filesize
64KB

Download
memory/2756-7-0x0000000002AF0000-0x0000000002B70000-memory.dmp

Filesize
512KB

Download
memory/2756-8-0x000000001B7C0000-0x000000001BAA2000-memory.dmp

Filesize
2.9MB

Download
memory/2756-9-0x0000000001D80000-0x0000000001D88000-memory.dmp

Filesize
32KB

Download
memory/2992-16-0x0000000002810000-0x0000000002818000-memory.dmp

Filesize
32KB

Download
memory/2992-15-0x000000001B5A0000-0x000000001B882000-memory.dmp

Filesize
2.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads