xworm | 0a279b10c9275eb70ef94843fc547db50eaf547ca08e68bb74d1f6e78e30c92d

General

Target

XClient.exe
Size

79KB
MD5

9201f8cf2c137f4803588d270d08c362
SHA1

e136c079f29364731b96e72752d95daaa2f7f831
SHA256

0a279b10c9275eb70ef94843fc547db50eaf547ca08e68bb74d1f6e78e30c92d
SHA512

294060a08512430755f76028fe881cf1ac63e07a34d3882ba1c672fc1d2c998a2a8ebc0109c162759dfe327e85d2b6b0d32867deffa769392975969e9f6a5067
SSDEEP

1536:C7+e+C/iiSeQ1oxACbS9zARGdwd60ZbhXOP6C0Ry:C7+2ihfquCbS9tYZb9OPdiy

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

147.185.221.23:38042

Attributes

Install_directory
%AppData%
install_file
SystemUser32.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/memory/2512-1-0x0000000000EA0000-0x0000000000EBA000-memory.dmp	family_xworm
behavioral2/files/0x000c00000001e595-58.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
4372	powershell.exe
4580	powershell.exe
4776	powershell.exe
1460	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-1-5-21-940901362-3608833189-1915618603-1000\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\SystemUser32.lnk	XClient.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\SystemUser32.lnk	XClient.exe

Executes dropped EXE 3 IoCs

pid	Process
916	SystemUser32.exe
4944	SystemUser32.exe
332	SystemUser32.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-1-5-21-940901362-3608833189-1915618603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SystemUser32 = "C:\\Users\\Admin\\AppData\\Roaming\\SystemUser32.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
5024	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
4372	powershell.exe
4372	powershell.exe
4580	powershell.exe
4580	powershell.exe
4776	powershell.exe
4776	powershell.exe
1460	powershell.exe
1460	powershell.exe
2512	XClient.exe

Suspicious use of AdjustPrivilegeToken 9 IoCs

description	pid	Process
Token: SeDebugPrivilege	2512	XClient.exe
Token: SeDebugPrivilege	4372	powershell.exe
Token: SeDebugPrivilege	4580	powershell.exe
Token: SeDebugPrivilege	4776	powershell.exe
Token: SeDebugPrivilege	1460	powershell.exe
Token: SeDebugPrivilege	2512	XClient.exe
Token: SeDebugPrivilege	916	SystemUser32.exe
Token: SeDebugPrivilege	4944	SystemUser32.exe
Token: SeDebugPrivilege	332	SystemUser32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2512	XClient.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2512 wrote to memory of 4372	2512	XClient.exe	94
PID 2512 wrote to memory of 4372	2512	XClient.exe	94
PID 2512 wrote to memory of 4580	2512	XClient.exe	97
PID 2512 wrote to memory of 4580	2512	XClient.exe	97
PID 2512 wrote to memory of 4776	2512	XClient.exe	100
PID 2512 wrote to memory of 4776	2512	XClient.exe	100
PID 2512 wrote to memory of 1460	2512	XClient.exe	102
PID 2512 wrote to memory of 1460	2512	XClient.exe	102
PID 2512 wrote to memory of 5024	2512	XClient.exe	104
PID 2512 wrote to memory of 5024	2512	XClient.exe	104

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 behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2512
- 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:4372
- 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:4580
- 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\SystemUser32.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4776
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'SystemUser32.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1460
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "SystemUser32" /tr "C:\Users\Admin\AppData\Roaming\SystemUser32.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:5024

C:\Users\Admin\AppData\Roaming\SystemUser32.exe
C:\Users\Admin\AppData\Roaming\SystemUser32.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:916

C:\Users\Admin\AppData\Roaming\SystemUser32.exe
C:\Users\Admin\AppData\Roaming\SystemUser32.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4944

C:\Users\Admin\AppData\Roaming\SystemUser32.exe
C:\Users\Admin\AppData\Roaming\SystemUser32.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:332

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\SystemUser32.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
a8e8360d573a4ff072dcc6f09d992c88

SHA1
3446774433ceaf0b400073914facab11b98b6807

SHA256
bf5e284e8f95122bf75ead61c7e2b40f55c96742b05330b5b1cb7915991df13b

SHA512
4ee5167643d82082f57c42616007ef9be57f43f9731921bdf7bca611a914724ad94072d3c8f5b130fa54129e5328ccdebf37ba74339c37deb53e79df5cdf0dbe

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

Filesize
944B

MD5
b51dc9e5ec3c97f72b4ca9488bbb4462

SHA1
5c1e8c0b728cd124edcacefb399bbd5e25b21bd3

SHA256
976f9534aa2976c85c2455bdde786a3f55d63aefdd40942eba1223c4c93590db

SHA512
0e5aa6cf64c535aefb833e5757b68e1094c87424abe2615a7d7d26b1b31eff358d12e36e75ca57fd690a9919b776600bf4c5c0e5a5df55366ba62238bdf3f280

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

Filesize
944B

MD5
e3b6cc0fbea08a0831f0026a696db8b8

SHA1
4e32202d4700061cfd80d55e42798131c9f530d4

SHA256
3284cae7b82be99d93064390ba071ba4321f3f24dd21515b37b2ca9f31b2e8d5

SHA512
6a06856f360b48c8bc8a15ffb8d7a6604ec357bcb1d0fad5d71a2cb876929a7b67eb40ba4493998ab1bbae8cb71212e124276f27d5c138a135041c27a41a0b7a

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_g305virk.owf.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\SystemUser32.exe

Filesize
79KB

MD5
9201f8cf2c137f4803588d270d08c362

SHA1
e136c079f29364731b96e72752d95daaa2f7f831

SHA256
0a279b10c9275eb70ef94843fc547db50eaf547ca08e68bb74d1f6e78e30c92d

SHA512
294060a08512430755f76028fe881cf1ac63e07a34d3882ba1c672fc1d2c998a2a8ebc0109c162759dfe327e85d2b6b0d32867deffa769392975969e9f6a5067

Download Submit
memory/2512-0-0x00007FF847423000-0x00007FF847425000-memory.dmp

Filesize
8KB

Download
memory/2512-2-0x00007FF847420000-0x00007FF847EE1000-memory.dmp

Filesize
10.8MB

Download
memory/2512-57-0x00007FF847420000-0x00007FF847EE1000-memory.dmp

Filesize
10.8MB

Download
memory/2512-1-0x0000000000EA0000-0x0000000000EBA000-memory.dmp

Filesize
104KB

Download
memory/4372-4-0x00007FF847420000-0x00007FF847EE1000-memory.dmp

Filesize
10.8MB

Download
memory/4372-15-0x00007FF847420000-0x00007FF847EE1000-memory.dmp

Filesize
10.8MB

Download
memory/4372-18-0x00007FF847420000-0x00007FF847EE1000-memory.dmp

Filesize
10.8MB

Download
memory/4372-14-0x0000022E5F330000-0x0000022E5F352000-memory.dmp

Filesize
136KB

Download
memory/4372-3-0x00007FF847420000-0x00007FF847EE1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads