xworm | 7c2910c7548a6fd1fe7eeacb7c24105a7049b670f1de0f5dbbe718e1d3cd3c70

General

Target

XClient.exe
Size

39KB
MD5

bc66e4663ecc5fe2d5c1ffb6399e828a
SHA1

95ef4b4ebecde00da0a3c6630a3556fb19b46a1a
SHA256

7c2910c7548a6fd1fe7eeacb7c24105a7049b670f1de0f5dbbe718e1d3cd3c70
SHA512

1334e5d14e5f85a2dbead8b566e5e78748b857e25da313a544699d6d5fcbf400d70619c41f3e1d56cd57006002f8a4ba8c7a21002fd6412dae54470087cca0d9
SSDEEP

768:Lz6nA3MxG5g8y5AcksKyJjL77FWPa9X2OwhAaG8r:/6nUuf5A72Fv9X2Ow6T8r

Score

10^/10

xworm persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

5.0

C2

127.0.0.1:2068

Mutex

6oJ1GSe3avoqc597

Attributes

Install_directory
%AppData%
install_file
FileExplorer.exe

aes.plain

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/memory/3668-1-0x0000000000EB0000-0x0000000000EC0000-memory.dmp	family_xworm
behavioral2/files/0x000b000000023b71-8.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\FileExplorer.lnk	XClient.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\FileExplorer.lnk	XClient.exe

Executes dropped EXE 2 IoCs

pid	Process
3644	FileExplorer.exe
3092	FileExplorer.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\FileExplorer = "C:\\Users\\Admin\\AppData\\Roaming\\FileExplorer.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
4232	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
3668	XClient.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	3668	XClient.exe
Token: SeDebugPrivilege	3668	XClient.exe
Token: SeDebugPrivilege	3644	FileExplorer.exe
Token: SeDebugPrivilege	3092	FileExplorer.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3668	XClient.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 3668 wrote to memory of 4232	3668	XClient.exe	84
PID 3668 wrote to memory of 4232	3668	XClient.exe	84

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:3668
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "FileExplorer" /tr "C:\Users\Admin\AppData\Roaming\FileExplorer.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4232

C:\Users\Admin\AppData\Roaming\FileExplorer.exe
C:\Users\Admin\AppData\Roaming\FileExplorer.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3644

C:\Users\Admin\AppData\Roaming\FileExplorer.exe
C:\Users\Admin\AppData\Roaming\FileExplorer.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3092

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\FileExplorer.exe.log

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

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

Filesize
39KB

MD5
bc66e4663ecc5fe2d5c1ffb6399e828a

SHA1
95ef4b4ebecde00da0a3c6630a3556fb19b46a1a

SHA256
7c2910c7548a6fd1fe7eeacb7c24105a7049b670f1de0f5dbbe718e1d3cd3c70

SHA512
1334e5d14e5f85a2dbead8b566e5e78748b857e25da313a544699d6d5fcbf400d70619c41f3e1d56cd57006002f8a4ba8c7a21002fd6412dae54470087cca0d9

Download Submit
memory/3644-10-0x00007FFC30340000-0x00007FFC30E01000-memory.dmp

Filesize
10.8MB

Download
memory/3644-12-0x00007FFC30340000-0x00007FFC30E01000-memory.dmp

Filesize
10.8MB

Download
memory/3668-0-0x00007FFC30343000-0x00007FFC30345000-memory.dmp

Filesize
8KB

Download
memory/3668-1-0x0000000000EB0000-0x0000000000EC0000-memory.dmp

Filesize
64KB

Download
memory/3668-6-0x00007FFC30340000-0x00007FFC30E01000-memory.dmp

Filesize
10.8MB

Download
memory/3668-7-0x00007FFC30340000-0x00007FFC30E01000-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