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 2 IoCs

resource	yara_rule
behavioral2/memory/3268-1-0x0000000000FC0000-0x0000000000FD0000-memory.dmp	family_xworm
behavioral2/files/0x000e000000023b76-59.dat	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
4256	powershell.exe
1624	powershell.exe
2980	powershell.exe
640	powershell.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	XClient.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
2092	SubDir.exe
2268	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-1-5-21-2437139445-1151884604-3026847218-1000\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
15	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
764	schtasks.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
1624	powershell.exe
1624	powershell.exe
2980	powershell.exe
2980	powershell.exe
640	powershell.exe
640	powershell.exe
4256	powershell.exe
4256	powershell.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	3268	XClient.exe
Token: SeDebugPrivilege	1624	powershell.exe
Token: SeDebugPrivilege	2980	powershell.exe
Token: SeDebugPrivilege	640	powershell.exe
Token: SeDebugPrivilege	4256	powershell.exe
Token: SeDebugPrivilege	3268	XClient.exe
Token: SeDebugPrivilege	2092	SubDir.exe
Token: SeDebugPrivilege	2268	SubDir.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 3268 wrote to memory of 1624	3268	XClient.exe	87
PID 3268 wrote to memory of 1624	3268	XClient.exe	87
PID 3268 wrote to memory of 2980	3268	XClient.exe	89
PID 3268 wrote to memory of 2980	3268	XClient.exe	89
PID 3268 wrote to memory of 640	3268	XClient.exe	91
PID 3268 wrote to memory of 640	3268	XClient.exe	91
PID 3268 wrote to memory of 4256	3268	XClient.exe	93
PID 3268 wrote to memory of 4256	3268	XClient.exe	93
PID 3268 wrote to memory of 764	3268	XClient.exe	95
PID 3268 wrote to memory of 764	3268	XClient.exe	95

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⤵
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3268
- 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:1624
- 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:2980
- 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:640
- 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:4256
- 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:764

C:\Users\Admin\AppData\Roaming\SubDir.exe
C:\Users\Admin\AppData\Roaming\SubDir.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2092

C:\Users\Admin\AppData\Roaming\SubDir.exe
C:\Users\Admin\AppData\Roaming\SubDir.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2268

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

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\SubDir.exe.log

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
bd5940f08d0be56e65e5f2aaf47c538e

SHA1
d7e31b87866e5e383ab5499da64aba50f03e8443

SHA256
2d2f364c75bd2897504249f42cdf1d19374f5230aad68fa9154ea3d03e3031a6

SHA512
c34d10c7e07da44a180fae9889b61f08903aa84e8ddfa80c31c272b1ef9d491b8cec6b8a4c836c3cb1583fe8f4955c6a8db872515de3a9e10eae09610c959406

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
60945d1a2e48da37d4ce8d9c56b6845a

SHA1
83e80a6acbeb44b68b0da00b139471f428a9d6c1

SHA256
314b91c00997034d6e015f40230d90ebbf57de5dc938b62c1a214d591793dbe3

SHA512
5d068f1d6443e26ae3cad1c80f969e50e5860967b314153c4d3b6efd1cfa39f0907c6427bec7fa43db079f258b6357e4e9a1b0b1a36b1481d2049ea0e67909ed

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
9a2c763c5ff40e18e49ad63c7c3b0088

SHA1
4b289ea34755323fa869da6ad6480d8d12385a36

SHA256
517807921c55bd16cd8a8bfae3d5dc19444c66f836b66acd5593e3080acbaf8e

SHA512
3af01926bc7de92076067d158d7250b206d396b3282ee0db43639d04d91bd9ff763acbce12c7822914824984a3c5fdd1b8dbf1ad2ee88233d47f0f808b746bc8

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_hjqsio0r.45k.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

Filesize
42KB

MD5
d050f2d0dc9d5164b947691216f38718

SHA1
9934fd9007bfdd2c1bb01287ee1faaedc4d1451b

SHA256
4da3bf8fbe28b89c7bbfe4c0ef6cebaf7be4505d00d97c6f452fbe1dca76e5c9

SHA512
f435373c1baed0a5377b86a62b373f2c2c4ce8d95fbd3e82b9de6503f566c5149c2644b7a19e05004f8714736de15fa71a801483b2129bc67ea47508eee4c469

Download Submit
memory/1624-13-0x00000127EE750000-0x00000127EE772000-memory.dmp

Filesize
136KB

Download
memory/1624-18-0x00007FFBC4240000-0x00007FFBC4D01000-memory.dmp

Filesize
10.8MB

Download
memory/1624-15-0x00007FFBC4240000-0x00007FFBC4D01000-memory.dmp

Filesize
10.8MB

Download
memory/1624-14-0x00007FFBC4240000-0x00007FFBC4D01000-memory.dmp

Filesize
10.8MB

Download
memory/1624-3-0x00007FFBC4240000-0x00007FFBC4D01000-memory.dmp

Filesize
10.8MB

Download
memory/3268-0-0x00007FFBC4243000-0x00007FFBC4245000-memory.dmp

Filesize
8KB

Download
memory/3268-53-0x00007FFBC4243000-0x00007FFBC4245000-memory.dmp

Filesize
8KB

Download
memory/3268-58-0x00007FFBC4240000-0x00007FFBC4D01000-memory.dmp

Filesize
10.8MB

Download
memory/3268-2-0x00007FFBC4240000-0x00007FFBC4D01000-memory.dmp

Filesize
10.8MB

Download
memory/3268-1-0x0000000000FC0000-0x0000000000FD0000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads