xworm | 199ee3f18851c782245dcab588d564a6bf478a8e6ed58a24282c5d0da2b13b57

Analysis

max time kernel
17s
max time network
21s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
20-11-2024 19:05

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General

Target

$77Client.exe
Size

36KB
MD5

d34ce882198bf4b647391e626aa7479c
SHA1

4c6ba05c0a3b7fef8692a1ed1897a8d52c7dce7d
SHA256

199ee3f18851c782245dcab588d564a6bf478a8e6ed58a24282c5d0da2b13b57
SHA512

5c51d583858f37102a55fbe472aab4f05925a800ddcb1e2d2b86643b8793f60a0002fb95853822c66df9b61479a45ea22e668b63d823112a037c45f608e8a538
SSDEEP

768:nFeJlFivlhnUH4o0+1Rxe6NFWPh9GTOwhao9FXkrI:nwJlQRUYo0WHrFK9GTOwoo72I

Score

10^/10

xworm persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

3.0

45.139.196.128:1111

Mutex

I41RJCTV1NVWwUi1

Attributes

Install_directory
%Public%
install_file
USB.exe

aes.plain

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral1/memory/4116-1-0x00000000002E0000-0x00000000002F0000-memory.dmp	family_xworm
behavioral1/files/0x0028000000045049-8.dat	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm
Xworm family
xworm

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-1-5-21-641261377-2215826147-608237349-1000\Control Panel\International\Geo\Nation	$77Client.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\$77Client.lnk	$77Client.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\$77Client.lnk	$77Client.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-1-5-21-641261377-2215826147-608237349-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\$77Client = "C:\\Users\\Public\\$77Client.exe"	$77Client.exe

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
3412	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
4116	$77Client.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4116	$77Client.exe
Token: SeDebugPrivilege	4116	$77Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4116	$77Client.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 4116 wrote to memory of 3412	4116	$77Client.exe	82
PID 4116 wrote to memory of 3412	4116	$77Client.exe	82

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\$77Client.exe
"C:\Users\Admin\AppData\Local\Temp\$77Client.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:4116
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "$77Client" /tr "C:\Users\Public\$77Client.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3412

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

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:\Users\Public\$77Client.exe

Filesize
36KB

MD5
d34ce882198bf4b647391e626aa7479c

SHA1
4c6ba05c0a3b7fef8692a1ed1897a8d52c7dce7d

SHA256
199ee3f18851c782245dcab588d564a6bf478a8e6ed58a24282c5d0da2b13b57

SHA512
5c51d583858f37102a55fbe472aab4f05925a800ddcb1e2d2b86643b8793f60a0002fb95853822c66df9b61479a45ea22e668b63d823112a037c45f608e8a538

Download Submit
memory/4116-0-0x00007FFCDB973000-0x00007FFCDB975000-memory.dmp

Filesize
8KB

Download
memory/4116-1-0x00000000002E0000-0x00000000002F0000-memory.dmp

Filesize
64KB

Download
memory/4116-10-0x00007FFCDB970000-0x00007FFCDC432000-memory.dmp

Filesize
10.8MB

Download
memory/4116-11-0x00007FFCDB973000-0x00007FFCDB975000-memory.dmp

Filesize
8KB

Download
memory/4116-12-0x000000001DE00000-0x000000001DE0A000-memory.dmp

Filesize
40KB

Download
memory/4116-13-0x00007FFCDB970000-0x00007FFCDC432000-memory.dmp

Filesize
10.8MB

Download