xworm | 8eaad7c6ce7471c8cba5b274b974e11427dcdb743b64480d9386afbd9aaebc79

General

Target

XClient.exe
Size

210KB
MD5

9bfbec6717ad855d87e16a7a36cf2060
SHA1

ad8feff48191bb239ae893caeab35e539735069c
SHA256

8eaad7c6ce7471c8cba5b274b974e11427dcdb743b64480d9386afbd9aaebc79
SHA512

168befaf6d0586a5173e8bf5f6e9efd6afac1b603b117c93464d49a806943cb6b3ecb8f4c318f1cf94e3b12c9b8e72dd0dd1228ca51d4c8eb290c180b17c780b
SSDEEP

3072:EPczFJ9Z4OClv8SKfbzxcwg7es6/Vsb8VKTup49oJMfF/H9N3Ky9NzLn7:ZRJ9oUhcX7elbKTuq9bfF/H9d9n

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

5.0

Mutex

JdATxGGlLfwymoJ6

Attributes

Install_directory
%AppData%
install_file
XClient.exe
pastebin_url
https://pastebin.com/raw/4YfEusCJ

aes.plain

Signatures

Detect Xworm Payload 4 IoCs

resource	yara_rule
behavioral1/memory/1780-1-0x00000000003D0000-0x000000000040A000-memory.dmp	family_xworm
behavioral1/files/0x0009000000012117-36.dat	family_xworm
behavioral1/memory/2108-38-0x0000000000C70000-0x0000000000CAA000-memory.dmp	family_xworm
behavioral1/memory/2172-40-0x0000000001130000-0x000000000116A000-memory.dmp	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm
Xworm family
xworm

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
1792	powershell.exe
2768	powershell.exe
2632	powershell.exe
2684	powershell.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 2 IoCs

pid	Process
2108	XClient.exe
2172	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-1-5-21-2872745919-2748461613-2989606286-1000\Software\Microsoft\Windows\CurrentVersion\Run\XClient = "C:\\Users\\Admin\\AppData\\Roaming\\XClient.exe"	XClient.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 43 IoCs

Web Service

T1102

flow	ioc
27	pastebin.com
33	pastebin.com
34	pastebin.com
40	pastebin.com
10	pastebin.com
14	pastebin.com
18	pastebin.com
22	pastebin.com
36	pastebin.com
42	pastebin.com
43	pastebin.com
45	pastebin.com
13	pastebin.com
15	pastebin.com
17	pastebin.com
30	pastebin.com
46	pastebin.com
12	pastebin.com
7	pastebin.com
37	pastebin.com
29	pastebin.com
47	pastebin.com
6	pastebin.com
16	pastebin.com
23	pastebin.com
26	pastebin.com
48	pastebin.com
8	pastebin.com
11	pastebin.com
35	pastebin.com
38	pastebin.com
31	pastebin.com
32	pastebin.com
9	pastebin.com
19	pastebin.com
20	pastebin.com
21	pastebin.com
41	pastebin.com
44	pastebin.com
24	pastebin.com
25	pastebin.com
28	pastebin.com
39	pastebin.com

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
4	ip-api.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
664	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1792	powershell.exe
2768	powershell.exe
2632	powershell.exe
2684	powershell.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	1780	XClient.exe
Token: SeDebugPrivilege	1792	powershell.exe
Token: SeDebugPrivilege	2768	powershell.exe
Token: SeDebugPrivilege	2632	powershell.exe
Token: SeDebugPrivilege	2684	powershell.exe
Token: SeDebugPrivilege	2108	XClient.exe
Token: SeDebugPrivilege	2172	XClient.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 1780 wrote to memory of 1792	1780	XClient.exe	31
PID 1780 wrote to memory of 1792	1780	XClient.exe	31
PID 1780 wrote to memory of 1792	1780	XClient.exe	31
PID 1780 wrote to memory of 2768	1780	XClient.exe	33
PID 1780 wrote to memory of 2768	1780	XClient.exe	33
PID 1780 wrote to memory of 2768	1780	XClient.exe	33
PID 1780 wrote to memory of 2632	1780	XClient.exe	35
PID 1780 wrote to memory of 2632	1780	XClient.exe	35
PID 1780 wrote to memory of 2632	1780	XClient.exe	35
PID 1780 wrote to memory of 2684	1780	XClient.exe	37
PID 1780 wrote to memory of 2684	1780	XClient.exe	37
PID 1780 wrote to memory of 2684	1780	XClient.exe	37
PID 1780 wrote to memory of 664	1780	XClient.exe	39
PID 1780 wrote to memory of 664	1780	XClient.exe	39
PID 1780 wrote to memory of 664	1780	XClient.exe	39
PID 1228 wrote to memory of 2108	1228	taskeng.exe	43
PID 1228 wrote to memory of 2108	1228	taskeng.exe	43
PID 1228 wrote to memory of 2108	1228	taskeng.exe	43
PID 1228 wrote to memory of 2172	1228	taskeng.exe	44
PID 1228 wrote to memory of 2172	1228	taskeng.exe	44
PID 1228 wrote to memory of 2172	1228	taskeng.exe	44

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⤵
- Drops startup file
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1780
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1792
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2768
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Roaming\XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2632
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2684
- 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:664

C:\Windows\system32\taskeng.exe
taskeng.exe {6E263324-2D28-4DF7-BA62-0DF27C6829D3} S-1-5-21-2872745919-2748461613-2989606286-1000:CCJBVTGQ\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:1228
- C:\Users\Admin\AppData\Roaming\XClient.exe
  C:\Users\Admin\AppData\Roaming\XClient.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2108
- C:\Users\Admin\AppData\Roaming\XClient.exe
  C:\Users\Admin\AppData\Roaming\XClient.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2172

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

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

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\J57UFFJ1FV4MORJ78WVF.temp

Filesize
7KB

MD5
dbaae16bf5238dc2be52c2456922e4b4

SHA1
3a550514394278dc2851c3cccf5fb981f030d722

SHA256
200f6662a160ee1db48fd7eb231dc8b7c28ca5b76d0150b0ba038add82ca3484

SHA512
38b022198b87b38832dd154f71f92691273acaa238298efa5789fa99e2d2fccba3acd4a71bbaea64a82f4d05b6e026bcb0a40e59149fab159b3023affe09d809

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

Filesize
210KB

MD5
9bfbec6717ad855d87e16a7a36cf2060

SHA1
ad8feff48191bb239ae893caeab35e539735069c

SHA256
8eaad7c6ce7471c8cba5b274b974e11427dcdb743b64480d9386afbd9aaebc79

SHA512
168befaf6d0586a5173e8bf5f6e9efd6afac1b603b117c93464d49a806943cb6b3ecb8f4c318f1cf94e3b12c9b8e72dd0dd1228ca51d4c8eb290c180b17c780b

Download Submit
memory/1780-1-0x00000000003D0000-0x000000000040A000-memory.dmp

Filesize
232KB

Download
memory/1780-2-0x000007FEF5970000-0x000007FEF635C000-memory.dmp

Filesize
9.9MB

Download
memory/1780-0-0x000007FEF5973000-0x000007FEF5974000-memory.dmp

Filesize
4KB

Download
memory/1780-33-0x000007FEF5970000-0x000007FEF635C000-memory.dmp

Filesize
9.9MB

Download
memory/1780-28-0x000007FEF5973000-0x000007FEF5974000-memory.dmp

Filesize
4KB

Download
memory/1792-7-0x0000000002D70000-0x0000000002DF0000-memory.dmp

Filesize
512KB

Download
memory/1792-9-0x0000000001E00000-0x0000000001E08000-memory.dmp

Filesize
32KB

Download
memory/1792-8-0x000000001B5D0000-0x000000001B8B2000-memory.dmp

Filesize
2.9MB

Download
memory/2108-38-0x0000000000C70000-0x0000000000CAA000-memory.dmp

Filesize
232KB

Download
memory/2172-40-0x0000000001130000-0x000000000116A000-memory.dmp

Filesize
232KB

Download
memory/2768-16-0x0000000001E60000-0x0000000001E68000-memory.dmp

Filesize
32KB

Download
memory/2768-15-0x000000001B720000-0x000000001BA02000-memory.dmp

Filesize
2.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads