xworm | fcd2edc86826bb43a8c5b0e98ea719fa311a85234c620cbb69a35112a5699e55

Analysis

max time kernel
361s
max time network
362s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
04-07-2024 21:25

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General

Target

XClient.exe
Size

74KB
MD5

c993fe2aacb27cf417f04ec1a2a7a0b9
SHA1

05b88b752cb79c86475691b4627faf8f1610d842
SHA256

fcd2edc86826bb43a8c5b0e98ea719fa311a85234c620cbb69a35112a5699e55
SHA512

8542a911dcb3839ff28a22d9285ca1494c1dedc5b2dcba07954939149d39e4f47a6a2b76b1a8db756309cc3b261fde03f903f55987868882c46cfe60b1513fb0
SSDEEP

1536:64S6Usxc2MdQHrL/L91JtmUbZGzaOa+Z4E6ORmp3jRO5+48cVo:6VMxc2nLL/R1J8UbZfOaXgRG3jROEl

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

tr3.localto.net:44953

Attributes

Install_directory
%ProgramData%
install_file
svchhost.exe

Signatures

Detect Xworm Payload 8 IoCs

resource	yara_rule
behavioral1/memory/1976-1-0x00000000009B0000-0x00000000009C8000-memory.dmp	family_xworm
behavioral1/files/0x000e000000014b27-34.dat	family_xworm
behavioral1/memory/2680-36-0x0000000000080000-0x0000000000098000-memory.dmp	family_xworm
behavioral1/memory/1328-39-0x00000000008E0000-0x00000000008F8000-memory.dmp	family_xworm
behavioral1/memory/1504-41-0x0000000000110000-0x0000000000128000-memory.dmp	family_xworm
behavioral1/memory/964-43-0x0000000000C30000-0x0000000000C48000-memory.dmp	family_xworm
behavioral1/memory/1792-45-0x0000000000C40000-0x0000000000C58000-memory.dmp	family_xworm
behavioral1/memory/2940-47-0x0000000000120000-0x0000000000138000-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
2108	powershell.exe
1140	powershell.exe
2516	powershell.exe
2840	powershell.exe

Deletes itself 1 IoCs

pid	Process
896	cmd.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 6 IoCs

pid	Process
2680	svchhost.exe
1328	svchhost.exe
1504	svchhost.exe
964	svchhost.exe
1792	svchhost.exe
2940	svchhost.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-1-5-21-1298544033-3225604241-2703760938-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchhost = "C:\\ProgramData\\svchhost.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

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2524	timeout.exe

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
3056	schtasks.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
1976	XClient.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2108	powershell.exe
1140	powershell.exe
2516	powershell.exe
2840	powershell.exe

Suspicious use of AdjustPrivilegeToken 12 IoCs

description	pid	Process
Token: SeDebugPrivilege	1976	XClient.exe
Token: SeDebugPrivilege	2108	powershell.exe
Token: SeDebugPrivilege	1140	powershell.exe
Token: SeDebugPrivilege	2516	powershell.exe
Token: SeDebugPrivilege	2840	powershell.exe
Token: SeDebugPrivilege	1976	XClient.exe
Token: SeDebugPrivilege	2680	svchhost.exe
Token: SeDebugPrivilege	1328	svchhost.exe
Token: SeDebugPrivilege	1504	svchhost.exe
Token: SeDebugPrivilege	964	svchhost.exe
Token: SeDebugPrivilege	1792	svchhost.exe
Token: SeDebugPrivilege	2940	svchhost.exe

Suspicious use of WriteProcessMemory 42 IoCs

description	pid	Process	procid_target
PID 1976 wrote to memory of 2108	1976	XClient.exe	29
PID 1976 wrote to memory of 2108	1976	XClient.exe	29
PID 1976 wrote to memory of 2108	1976	XClient.exe	29
PID 1976 wrote to memory of 1140	1976	XClient.exe	31
PID 1976 wrote to memory of 1140	1976	XClient.exe	31
PID 1976 wrote to memory of 1140	1976	XClient.exe	31
PID 1976 wrote to memory of 2516	1976	XClient.exe	33
PID 1976 wrote to memory of 2516	1976	XClient.exe	33
PID 1976 wrote to memory of 2516	1976	XClient.exe	33
PID 1976 wrote to memory of 2840	1976	XClient.exe	35
PID 1976 wrote to memory of 2840	1976	XClient.exe	35
PID 1976 wrote to memory of 2840	1976	XClient.exe	35
PID 1976 wrote to memory of 3056	1976	XClient.exe	37
PID 1976 wrote to memory of 3056	1976	XClient.exe	37
PID 1976 wrote to memory of 3056	1976	XClient.exe	37
PID 1960 wrote to memory of 2680	1960	taskeng.exe	40
PID 1960 wrote to memory of 2680	1960	taskeng.exe	40
PID 1960 wrote to memory of 2680	1960	taskeng.exe	40
PID 1960 wrote to memory of 1328	1960	taskeng.exe	43
PID 1960 wrote to memory of 1328	1960	taskeng.exe	43
PID 1960 wrote to memory of 1328	1960	taskeng.exe	43
PID 1960 wrote to memory of 1504	1960	taskeng.exe	44
PID 1960 wrote to memory of 1504	1960	taskeng.exe	44
PID 1960 wrote to memory of 1504	1960	taskeng.exe	44
PID 1960 wrote to memory of 964	1960	taskeng.exe	45
PID 1960 wrote to memory of 964	1960	taskeng.exe	45
PID 1960 wrote to memory of 964	1960	taskeng.exe	45
PID 1960 wrote to memory of 1792	1960	taskeng.exe	46
PID 1960 wrote to memory of 1792	1960	taskeng.exe	46
PID 1960 wrote to memory of 1792	1960	taskeng.exe	46
PID 1960 wrote to memory of 2940	1960	taskeng.exe	47
PID 1960 wrote to memory of 2940	1960	taskeng.exe	47
PID 1960 wrote to memory of 2940	1960	taskeng.exe	47
PID 1976 wrote to memory of 2924	1976	XClient.exe	48
PID 1976 wrote to memory of 2924	1976	XClient.exe	48
PID 1976 wrote to memory of 2924	1976	XClient.exe	48
PID 1976 wrote to memory of 896	1976	XClient.exe	50
PID 1976 wrote to memory of 896	1976	XClient.exe	50
PID 1976 wrote to memory of 896	1976	XClient.exe	50
PID 896 wrote to memory of 2524	896	cmd.exe	52
PID 896 wrote to memory of 2524	896	cmd.exe	52
PID 896 wrote to memory of 2524	896	cmd.exe	52

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: AddClipboardFormatListener
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1976
- 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:2108
- 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:1140
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\ProgramData\svchhost.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2516
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'svchhost.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2840
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "svchhost" /tr "C:\ProgramData\svchhost.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3056
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /delete /f /tn "svchhost"
  2⤵
  PID:2924
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp95BA.tmp.bat""
  2⤵
  - Deletes itself
  - Suspicious use of WriteProcessMemory
  PID:896
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2524

C:\Windows\system32\taskeng.exe
taskeng.exe {736A5500-2BFC-42EC-B1C0-787723CE5EE2} S-1-5-21-1298544033-3225604241-2703760938-1000:IZKCKOTP\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:1960
- C:\ProgramData\svchhost.exe
  C:\ProgramData\svchhost.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2680
- C:\ProgramData\svchhost.exe
  C:\ProgramData\svchhost.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1328
- C:\ProgramData\svchhost.exe
  C:\ProgramData\svchhost.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1504
- C:\ProgramData\svchhost.exe
  C:\ProgramData\svchhost.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:964
- C:\ProgramData\svchhost.exe
  C:\ProgramData\svchhost.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1792
- C:\ProgramData\svchhost.exe
  C:\ProgramData\svchhost.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2940

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\ProgramData\svchhost.exe

Filesize
74KB

MD5
c993fe2aacb27cf417f04ec1a2a7a0b9

SHA1
05b88b752cb79c86475691b4627faf8f1610d842

SHA256
fcd2edc86826bb43a8c5b0e98ea719fa311a85234c620cbb69a35112a5699e55

SHA512
8542a911dcb3839ff28a22d9285ca1494c1dedc5b2dcba07954939149d39e4f47a6a2b76b1a8db756309cc3b261fde03f903f55987868882c46cfe60b1513fb0

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp95BA.tmp.bat

Filesize
159B

MD5
1d6ac6bdca27d7c91100b59f20653886

SHA1
01b4b5eec122d77baf193032e9aec19cb6fe1046

SHA256
e9d43512edc8d54767a48b882b08668c66b49c727c0c00d7a6030d87b3189bbc

SHA512
10c4ca0221b62ae4535cb67cef65b5c8a18bc4ba932ed26b9219616864a29ddf5f15e5aed1a89edb537920790d2351f12d03d242dea8b120ba122443ef57620d

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\HY8RK5UOVKMN9KDRZFAS.temp

Filesize
7KB

MD5
e97d4e2340f92eb730e5da60a005890e

SHA1
593f02d3ef1e42b9beb5c6e74935267c56ff4a4f

SHA256
e7ce52c502a5836c6d4a732f92af746af72973019dde4b26e8fa2bb50c0d7908

SHA512
f6da0d1914a90df165dcd0a9358372d5f7e2ac731509bc54b5c3efd74f832c3343d2d61b6594e260b03e3f66e794f95899a531bde97338e323946a144d1d169f

Download Submit
memory/964-43-0x0000000000C30000-0x0000000000C48000-memory.dmp

Filesize
96KB

Download
memory/1140-15-0x000000001B560000-0x000000001B842000-memory.dmp

Filesize
2.9MB

Download
memory/1140-16-0x0000000002790000-0x0000000002798000-memory.dmp

Filesize
32KB

Download
memory/1328-39-0x00000000008E0000-0x00000000008F8000-memory.dmp

Filesize
96KB

Download
memory/1504-41-0x0000000000110000-0x0000000000128000-memory.dmp

Filesize
96KB

Download
memory/1792-45-0x0000000000C40000-0x0000000000C58000-memory.dmp

Filesize
96KB

Download
memory/1976-32-0x000007FEF5C30000-0x000007FEF661C000-memory.dmp

Filesize
9.9MB

Download
memory/1976-0-0x000007FEF5C33000-0x000007FEF5C34000-memory.dmp

Filesize
4KB

Download
memory/1976-2-0x000007FEF5C30000-0x000007FEF661C000-memory.dmp

Filesize
9.9MB

Download
memory/1976-48-0x000000001AA40000-0x000000001AA4C000-memory.dmp

Filesize
48KB

Download
memory/1976-1-0x00000000009B0000-0x00000000009C8000-memory.dmp

Filesize
96KB

Download
memory/1976-59-0x000007FEF5C30000-0x000007FEF661C000-memory.dmp

Filesize
9.9MB

Download
memory/2108-9-0x00000000028F0000-0x00000000028F8000-memory.dmp

Filesize
32KB

Download
memory/2108-8-0x000000001B5A0000-0x000000001B882000-memory.dmp

Filesize
2.9MB

Download
memory/2108-7-0x0000000002810000-0x0000000002890000-memory.dmp

Filesize
512KB

Download
memory/2680-36-0x0000000000080000-0x0000000000098000-memory.dmp

Filesize
96KB

Download
memory/2940-47-0x0000000000120000-0x0000000000138000-memory.dmp

Filesize
96KB

Download