xworm | 5eff5c5de41bfde202b7f8c545330b42a3b6b3b51df8abd66c06823a0404d9e6

General

Target

XClient.exe
Size

69KB
MD5

4f035ef4de3102e56d73a1e5bc0133ce
SHA1

f9a6464bec36e6171ca140fb0b9ba97a9dab6afe
SHA256

5eff5c5de41bfde202b7f8c545330b42a3b6b3b51df8abd66c06823a0404d9e6
SHA512

e3235deaf69c9b806b0df6d17cdd6987ceb25e96ee51358173e8c836eff06ab8637eab07b49b3b323c5d6b97b8a194d176f5dff3a131cebe74176b39e5fd1dec
SSDEEP

1536:R1TbxvCM8IIEQlpGzFt6LnXvb32CxMyLMUv12tOsVyCMnV:jTlB8IxcpGJt6zfb3221v12tOsVyjV

Score

10^/10

xworm persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

3.1

C2

193.161.193.99 :44548

Attributes

Install_directory
%ProgramData%
install_file
USB.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/memory/3276-1-0x0000000000020000-0x0000000000038000-memory.dmp	family_xworm
behavioral2/files/0x00090000000233cd-9.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-1-5-21-2539840389-1261165778-1087677076-1000\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 3 IoCs

pid	Process
3556	XClient.exe
732	XClient.exe
2724	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-1-5-21-2539840389-1261165778-1087677076-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\XClient = "C:\\ProgramData\\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
15	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
5084	schtasks.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	3276	XClient.exe
Token: SeDebugPrivilege	3556	XClient.exe
Token: SeDebugPrivilege	732	XClient.exe
Token: SeDebugPrivilege	2724	XClient.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 3276 wrote to memory of 5084	3276	XClient.exe	85
PID 3276 wrote to memory of 5084	3276	XClient.exe	85

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:3276
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "XClient" /tr "C:\ProgramData\XClient.exe"
  2⤵
  - Creates scheduled task(s)
  PID:5084

C:\ProgramData\XClient.exe
C:\ProgramData\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3556

C:\ProgramData\XClient.exe
C:\ProgramData\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:732

C:\ProgramData\XClient.exe
C:\ProgramData\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2724

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

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Downloads

C:\ProgramData\XClient.exe

Filesize
69KB

MD5
4f035ef4de3102e56d73a1e5bc0133ce

SHA1
f9a6464bec36e6171ca140fb0b9ba97a9dab6afe

SHA256
5eff5c5de41bfde202b7f8c545330b42a3b6b3b51df8abd66c06823a0404d9e6

SHA512
e3235deaf69c9b806b0df6d17cdd6987ceb25e96ee51358173e8c836eff06ab8637eab07b49b3b323c5d6b97b8a194d176f5dff3a131cebe74176b39e5fd1dec

Download Submit
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
memory/3276-0-0x00007FFB83F33000-0x00007FFB83F35000-memory.dmp

Filesize
8KB

Download
memory/3276-1-0x0000000000020000-0x0000000000038000-memory.dmp

Filesize
96KB

Download
memory/3276-2-0x00007FFB83F30000-0x00007FFB849F1000-memory.dmp

Filesize
10.8MB

Download
memory/3276-11-0x00007FFB83F33000-0x00007FFB83F35000-memory.dmp

Filesize
8KB

Download
memory/3276-12-0x00007FFB83F30000-0x00007FFB849F1000-memory.dmp

Filesize
10.8MB

Download
memory/3556-15-0x00007FFB83F30000-0x00007FFB849F1000-memory.dmp

Filesize
10.8MB

Download
memory/3556-17-0x00007FFB83F30000-0x00007FFB849F1000-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