xworm | 20ba1d60db4e5d51a698d7ab07e8a5dd75cd6aaae792c76dda315d757b9dfdde

General

Target

Gorilla tag.exe
Size

429KB
MD5

a47502d0bdaa67d14c762565ee7864d6
SHA1

afed9a6ac84e97bbd2dc2593ff6204716e696695
SHA256

20ba1d60db4e5d51a698d7ab07e8a5dd75cd6aaae792c76dda315d757b9dfdde
SHA512

dae6c201c878da5438a58bc6258cb7287ddfbf002c01c0a13deb4039a4fe5e8a85be04c57367f56de4ac26ae0a3fb0d166b27e06de354bf3b2efd38af5c636e9
SSDEEP

6144:BkGb8qJ+GIIIIIIIhIIIIIIIIIIIIIIIUz9bfF/H9d9n:BRC9

Score

10^/10

xworm persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

est-review.gl.at.ply.gg:21148

Attributes

Install_directory
%AppData%
install_file
XClient.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/memory/3444-1-0x00000000001E0000-0x0000000000252000-memory.dmp	family_xworm
behavioral2/files/0x000a000000023b93-8.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	Gorilla tag.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 3 IoCs

pid	Process
3896	XClient.exe
4228	XClient.exe
2832	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"	Gorilla tag.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
5096	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
3444	Gorilla tag.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	3444	Gorilla tag.exe
Token: SeDebugPrivilege	3444	Gorilla tag.exe
Token: SeDebugPrivilege	3896	XClient.exe
Token: SeDebugPrivilege	4228	XClient.exe
Token: SeDebugPrivilege	2832	XClient.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3444	Gorilla tag.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 3444 wrote to memory of 5096	3444	Gorilla tag.exe	86
PID 3444 wrote to memory of 5096	3444	Gorilla tag.exe	86

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\Gorilla tag.exe
"C:\Users\Admin\AppData\Local\Temp\Gorilla tag.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:3444
- 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:5096

C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3896

C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4228

C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2832

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
429KB

MD5
a47502d0bdaa67d14c762565ee7864d6

SHA1
afed9a6ac84e97bbd2dc2593ff6204716e696695

SHA256
20ba1d60db4e5d51a698d7ab07e8a5dd75cd6aaae792c76dda315d757b9dfdde

SHA512
dae6c201c878da5438a58bc6258cb7287ddfbf002c01c0a13deb4039a4fe5e8a85be04c57367f56de4ac26ae0a3fb0d166b27e06de354bf3b2efd38af5c636e9

Download Submit
memory/3444-0-0x00007FFE174C3000-0x00007FFE174C5000-memory.dmp

Filesize
8KB

Download
memory/3444-1-0x00000000001E0000-0x0000000000252000-memory.dmp

Filesize
456KB

Download
memory/3444-6-0x00007FFE174C0000-0x00007FFE17F81000-memory.dmp

Filesize
10.8MB

Download
memory/3444-7-0x00007FFE174C0000-0x00007FFE17F81000-memory.dmp

Filesize
10.8MB

Download
memory/3896-10-0x00007FFE174C0000-0x00007FFE17F81000-memory.dmp

Filesize
10.8MB

Download
memory/3896-12-0x00007FFE174C0000-0x00007FFE17F81000-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