xworm | 630b2a1ee3471f27100a0937e137b8eb020bda08d8bb8f77dfa6075676443da8

General

Target

XClient.exe
Size

32KB
MD5

61dec39ff827ef9850ed12f932ab22ed
SHA1

0fbf2330c943bdc02078dde76e8abdfe2718f779
SHA256

630b2a1ee3471f27100a0937e137b8eb020bda08d8bb8f77dfa6075676443da8
SHA512

09b2792d136b0a46178d5519cc3516a0910294921cba3f349a8154adbc2d2eb1be3bec6106fba97574c8c128c86963185cafded90443e0df145530bdd363d9cd
SSDEEP

768:FXJVfQAQ/PWNDflzs0rGZFh9A+6O/ho/h+a:FZVfQAMKs0rmFh9A+6O/e8a

Score

10^/10

xworm persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

3.1

C2

45.139.196.188:30120

Mutex

LGW1OffJggMqu1JK

Attributes

Install_directory
%AppData%
install_file
USB.exe

aes.plain

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/memory/4928-1-0x0000000000200000-0x000000000020E000-memory.dmp	family_xworm
behavioral2/files/0x0010000000023b88-8.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-1-5-21-493223053-2004649691-1575712786-1000\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
4448	XClient.exe
2396	XClient.exe
5080	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-1-5-21-493223053-2004649691-1575712786-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\XClient = "C:\\Users\\Admin\\AppData\\Roaming\\XClient.exe"	XClient.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
3180	schtasks.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	4928	XClient.exe
Token: SeDebugPrivilege	4448	XClient.exe
Token: SeDebugPrivilege	2396	XClient.exe
Token: SeDebugPrivilege	5080	XClient.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 4928 wrote to memory of 3180	4928	XClient.exe	90
PID 4928 wrote to memory of 3180	4928	XClient.exe	90

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:4928
- 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⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3180

C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4448

C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2396

C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:5080

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

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\XClient.exe.log

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

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

Filesize
32KB

MD5
61dec39ff827ef9850ed12f932ab22ed

SHA1
0fbf2330c943bdc02078dde76e8abdfe2718f779

SHA256
630b2a1ee3471f27100a0937e137b8eb020bda08d8bb8f77dfa6075676443da8

SHA512
09b2792d136b0a46178d5519cc3516a0910294921cba3f349a8154adbc2d2eb1be3bec6106fba97574c8c128c86963185cafded90443e0df145530bdd363d9cd

Download Submit
memory/4448-15-0x00007FFC0F870000-0x00007FFC10331000-memory.dmp

Filesize
10.8MB

Download
memory/4448-17-0x00007FFC0F870000-0x00007FFC10331000-memory.dmp

Filesize
10.8MB

Download
memory/4928-0-0x00007FFC0F873000-0x00007FFC0F875000-memory.dmp

Filesize
8KB

Download
memory/4928-1-0x0000000000200000-0x000000000020E000-memory.dmp

Filesize
56KB

Download
memory/4928-10-0x00007FFC0F870000-0x00007FFC10331000-memory.dmp

Filesize
10.8MB

Download
memory/4928-11-0x00007FFC0F873000-0x00007FFC0F875000-memory.dmp

Filesize
8KB

Download
memory/4928-12-0x00007FFC0F870000-0x00007FFC10331000-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