xworm | ea0cd48a7bbf5c3df7505631380715287c22db6cdb770dc36f211bba02bae59b

General

Target

MasonClient.exe
Size

48KB
MD5

8f28ca9a926d19b481928e7943818c18
SHA1

c39af1be425a90eb806d2874ad210266f55f297c
SHA256

ea0cd48a7bbf5c3df7505631380715287c22db6cdb770dc36f211bba02bae59b
SHA512

2acdbfe077ebc93a50836c7a719646445e48bfb893c05ccc06260bc815b91e28b0f5cd478131be2a71e330621f50d7712a3169c4234e68ebb6d7367aac9fc789
SSDEEP

1536:Wt1VFdabn9SaSLxeQSoY7r8WnRzWnRYWnRVWnRyWnR899LSyYaW2ta46aXHWnRo5:m1DD3A5b3hbO1

Score

10^/10

xworm persistence rat trojan

Malware Config

Extracted

Family

xworm

Attributes

Install_directory
%port%
install_file
USB.exe
pastebin_url
https://pastebin.com/raw/6EU9ps8S

Signatures

Detect Xworm Payload 3 IoCs

resource	yara_rule
behavioral1/memory/1640-1-0x00000000008D0000-0x00000000008E2000-memory.dmp	family_xworm
behavioral1/memory/1640-4-0x000000001B6C0000-0x000000001B6D2000-memory.dmp	family_xworm
behavioral1/files/0x000500000001da5b-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-1-5-21-1161330783-2912525651-1278508834-1000\Control Panel\International\Geo\Nation	MasonClient.exe

Executes dropped EXE 3 IoCs

pid	Process
2676	MasonClient.exe
2272	MasonClient.exe
2456	MasonClient.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-1-5-21-1161330783-2912525651-1278508834-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\MasonClient = "C:\\Users\\Admin\\AppData\\Roaming\\MasonClient.exe"	MasonClient.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 4 IoCs

Web Service

T1102

flow	ioc
16	pastebin.com
18	pastebin.com
35	raw.githubusercontent.com
36	raw.githubusercontent.com

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
4444	schtasks.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	1640	MasonClient.exe
Token: SeDebugPrivilege	2676	MasonClient.exe
Token: SeDebugPrivilege	2272	MasonClient.exe
Token: SeDebugPrivilege	2456	MasonClient.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 1640 wrote to memory of 4444	1640	MasonClient.exe	87
PID 1640 wrote to memory of 4444	1640	MasonClient.exe	87

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\MasonClient.exe
"C:\Users\Admin\AppData\Local\Temp\MasonClient.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1640
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /sc minute /mo 1 /tn "MasonClient" /tr "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4444

C:\Users\Admin\AppData\Roaming\MasonClient.exe
C:\Users\Admin\AppData\Roaming\MasonClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2676

C:\Users\Admin\AppData\Roaming\MasonClient.exe
C:\Users\Admin\AppData\Roaming\MasonClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2272

C:\Users\Admin\AppData\Roaming\MasonClient.exe
C:\Users\Admin\AppData\Roaming\MasonClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2456

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

Web Service

1

T1102

Exfiltration

Impact

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Downloads

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

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

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

Filesize
48KB

MD5
8f28ca9a926d19b481928e7943818c18

SHA1
c39af1be425a90eb806d2874ad210266f55f297c

SHA256
ea0cd48a7bbf5c3df7505631380715287c22db6cdb770dc36f211bba02bae59b

SHA512
2acdbfe077ebc93a50836c7a719646445e48bfb893c05ccc06260bc815b91e28b0f5cd478131be2a71e330621f50d7712a3169c4234e68ebb6d7367aac9fc789

Download Submit
memory/1640-0-0x00007FFE64353000-0x00007FFE64355000-memory.dmp

Filesize
8KB

Download
memory/1640-1-0x00000000008D0000-0x00000000008E2000-memory.dmp

Filesize
72KB

Download
memory/1640-3-0x00007FFE64350000-0x00007FFE64E11000-memory.dmp

Filesize
10.8MB

Download
memory/1640-4-0x000000001B6C0000-0x000000001B6D2000-memory.dmp

Filesize
72KB

Download
memory/1640-5-0x00007FFE64353000-0x00007FFE64355000-memory.dmp

Filesize
8KB

Download
memory/1640-6-0x00007FFE64350000-0x00007FFE64E11000-memory.dmp

Filesize
10.8MB

Download
memory/2676-9-0x00007FFE64350000-0x00007FFE64E11000-memory.dmp

Filesize
10.8MB

Download
memory/2676-11-0x00007FFE64350000-0x00007FFE64E11000-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