xworm | f7843b0b0eb2fca9ff607eec3ec9c5b400b6c74ab3b163b22cae66e965eb35d1

General

Target

XClient.exe
Size

36KB
MD5

f9eee82e0d96419e18514a0540a72dea
SHA1

64b7a06ea6e88d16931b6c97ff36869744a5216b
SHA256

f7843b0b0eb2fca9ff607eec3ec9c5b400b6c74ab3b163b22cae66e965eb35d1
SHA512

43c1667699f4882b803f69d11dcc53a4b73273e94bc412c26199052719f36a209024ce20aafe37af7184e331082b2452fd70ffda432aba1c69eae6a15fa63298
SSDEEP

768:zT+hH75UhRF3hwU2OmAkIzFk9YPO/hAn/tm:zT675yJ23AkyFk9YPO/+lm

Score

10^/10

xworm persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

5.0

C2

127.0.0.1:8848

Mutex

CGrjcZNxUnIVqx0i

Attributes

Install_directory
%AppData%
install_file
XClient.exe

aes.plain

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral1/memory/1020-1-0x00000000008E0000-0x00000000008F0000-memory.dmp	family_xworm
behavioral1/files/0x000200000001e79d-10.dat	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat 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-1-5-21-4124900551-4068476067-3491212533-1000\Control Panel\International\Geo\Nation	XClient.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 2 IoCs

pid	Process
3284	XClient.exe
3884	XClient.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-1-5-21-4124900551-4068476067-3491212533-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\XClient = "C:\\Users\\Admin\\AppData\\Roaming\\XClient.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
21	ip-api.com

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
1568	schtasks.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1020	XClient.exe
Token: SeDebugPrivilege	3284	XClient.exe
Token: SeDebugPrivilege	3884	XClient.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 1020 wrote to memory of 1568	1020	XClient.exe	93
PID 1020 wrote to memory of 1568	1020	XClient.exe	93

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:1020
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "XClient" /tr "C:\Users\Admin\AppData\Roaming\XClient.exe"
  2⤵
  - Creates scheduled task(s)
  PID:1568

C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3284

C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3884

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

Scheduled Task/Job

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

Scheduled Task/Job

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

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

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

Filesize
36KB

MD5
f9eee82e0d96419e18514a0540a72dea

SHA1
64b7a06ea6e88d16931b6c97ff36869744a5216b

SHA256
f7843b0b0eb2fca9ff607eec3ec9c5b400b6c74ab3b163b22cae66e965eb35d1

SHA512
43c1667699f4882b803f69d11dcc53a4b73273e94bc412c26199052719f36a209024ce20aafe37af7184e331082b2452fd70ffda432aba1c69eae6a15fa63298

Download Submit
memory/1020-0-0x00007FF8B0ED3000-0x00007FF8B0ED5000-memory.dmp

Filesize
8KB

Download
memory/1020-1-0x00000000008E0000-0x00000000008F0000-memory.dmp

Filesize
64KB

Download
memory/1020-2-0x00007FF8B0ED0000-0x00007FF8B1991000-memory.dmp

Filesize
10.8MB

Download
memory/1020-7-0x00007FF8B0ED3000-0x00007FF8B0ED5000-memory.dmp

Filesize
8KB

Download
memory/1020-8-0x00007FF8B0ED0000-0x00007FF8B1991000-memory.dmp

Filesize
10.8MB

Download
memory/3284-12-0x00007FF8B0ED0000-0x00007FF8B1991000-memory.dmp

Filesize
10.8MB

Download
memory/3284-14-0x00007FF8B0ED0000-0x00007FF8B1991000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads