xworm | 3465eee847488e3fd2f70bc78642ce8f82cbef40b95b5ac448901d9e13c07dbb

General

Target

XClient.exe
Size

76KB
MD5

8807fa0a397ac570dd8b1d6bed1aadc5
SHA1

27531764eb5629d02ef10ad25a89328daa442f5a
SHA256

3465eee847488e3fd2f70bc78642ce8f82cbef40b95b5ac448901d9e13c07dbb
SHA512

ebedb1bd4ee83d2e1f97868c0cd5574e34deb2e61db2ec01e3ae32f11e979504a527391fdd3dcad02f785a4ea7d87084b23f396316a06fda3e01f8f1341f790b
SSDEEP

1536:eX3pX/Z0rG675wHvayJbtE+bC5v5tUfJ3X1QkOyog9B3Kqb8:eX3R/KrN74ayJa+bCVQRekOG9Baqb8

Score

10^/10

xworm persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

192.168.29.241:22119

Attributes

Install_directory
%ProgramData%
install_file
USB.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/memory/4496-1-0x0000000000DB0000-0x0000000000DC8000-memory.dmp	family_xworm
behavioral2/files/0x0002000000022ab7-7.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-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	XClient.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 3 IoCs

pid	Process
708	Comet
4700	Comet
964	Comet

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-1-5-21-3350944739-639801879-157714471-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Comet = "C:\\ProgramData\\Comet"	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
3280	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
4496	XClient.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	4496	XClient.exe
Token: SeDebugPrivilege	4496	XClient.exe
Token: SeDebugPrivilege	708	Comet
Token: SeDebugPrivilege	4700	Comet
Token: SeDebugPrivilege	964	Comet

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4496	XClient.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 4496 wrote to memory of 3280	4496	XClient.exe	93
PID 4496 wrote to memory of 3280	4496	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 behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4496
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Comet" /tr "C:\ProgramData\Comet"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3280

C:\ProgramData\Comet
C:\ProgramData\Comet
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:708

C:\ProgramData\Comet
C:\ProgramData\Comet
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4700

C:\ProgramData\Comet
C:\ProgramData\Comet
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:964

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

Replay Monitor

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Downloads

C:\ProgramData\Comet

Filesize
76KB

MD5
8807fa0a397ac570dd8b1d6bed1aadc5

SHA1
27531764eb5629d02ef10ad25a89328daa442f5a

SHA256
3465eee847488e3fd2f70bc78642ce8f82cbef40b95b5ac448901d9e13c07dbb

SHA512
ebedb1bd4ee83d2e1f97868c0cd5574e34deb2e61db2ec01e3ae32f11e979504a527391fdd3dcad02f785a4ea7d87084b23f396316a06fda3e01f8f1341f790b

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Comet.log

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

Download Submit
memory/708-9-0x00007FFF28EB0000-0x00007FFF29971000-memory.dmp

Filesize
10.8MB

Download
memory/708-11-0x00007FFF28EB0000-0x00007FFF29971000-memory.dmp

Filesize
10.8MB

Download
memory/4496-0-0x00007FFF28EB3000-0x00007FFF28EB5000-memory.dmp

Filesize
8KB

Download
memory/4496-1-0x0000000000DB0000-0x0000000000DC8000-memory.dmp

Filesize
96KB

Download
memory/4496-5-0x00007FFF28EB0000-0x00007FFF29971000-memory.dmp

Filesize
10.8MB

Download
memory/4496-6-0x00007FFF28EB3000-0x00007FFF28EB5000-memory.dmp

Filesize
8KB

Download
memory/4496-12-0x00007FFF28EB0000-0x00007FFF29971000-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