xworm | a22f6db007744f7768782280e66832487b3b193ff20825203bb56210b7c4e923

General

Target

xwo.exe
Size

189KB
MD5

7949220a0b341111716a81695324be27
SHA1

d79653b53e3affa5081d25cdea077299105d0472
SHA256

a22f6db007744f7768782280e66832487b3b193ff20825203bb56210b7c4e923
SHA512

e051e96a0334ce6cc7b6a43dffebfdcf93b40824db9cec64c6a2e71aed24bd26232645edbac14a47afe02fb0d12384da9648ea402df9232892330afce91fe303
SSDEEP

3072:jqWg0oaxBGieuvQTtv6c/mTRPyZqqiIdhI+czv/gJQE7zK+l+2aVtUq9JosKh:jgP8GiHvQTV+d/qi25eKfU2cDJ18

Score

10^/10

xworm discovery persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

5.0

C2

husktools.duckdns.org:7000

Mutex

9W5nR6YNY2Cs1cQg

Attributes

Install_directory
%Userprofile%
install_file
XClient.exe

aes.plain

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral2/memory/4344-1-0x0000000000400000-0x0000000000410000-memory.dmp	family_xworm

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

Drops startup file 2 IoCs

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

Executes dropped EXE 2 IoCs

pid	Process
412	XClient.exe
676	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-1-5-21-3442511616-637977696-3186306149-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\XClient = "C:\\Users\\Admin\\XClient.exe"	MSBuild.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 408 set thread context of 4344	408	xwo.exe	85

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2520	408	WerFault.exe	83

System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	xwo.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	MSBuild.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	XClient.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	XClient.exe

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
3224	schtasks.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4344	MSBuild.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 408 wrote to memory of 4344	408	xwo.exe	85
PID 408 wrote to memory of 4344	408	xwo.exe	85
PID 408 wrote to memory of 4344	408	xwo.exe	85
PID 408 wrote to memory of 4344	408	xwo.exe	85
PID 408 wrote to memory of 4344	408	xwo.exe	85
PID 408 wrote to memory of 4344	408	xwo.exe	85
PID 408 wrote to memory of 4344	408	xwo.exe	85
PID 408 wrote to memory of 4344	408	xwo.exe	85
PID 4344 wrote to memory of 3224	4344	MSBuild.exe	93
PID 4344 wrote to memory of 3224	4344	MSBuild.exe	93
PID 4344 wrote to memory of 3224	4344	MSBuild.exe	93

C:\Users\Admin\AppData\Local\Temp\xwo.exe
"C:\Users\Admin\AppData\Local\Temp\xwo.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:408
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe"
  2⤵
  - Drops startup file
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4344
- - C:\Windows\SysWOW64\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "XClient" /tr "C:\Users\Admin\XClient.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3224
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 408 -s 140
  2⤵
  - Program crash
  PID:2520

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 408 -ip 408
1⤵
PID:860

C:\Users\Admin\XClient.exe
C:\Users\Admin\XClient.exe
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
PID:412

C:\Users\Admin\XClient.exe
C:\Users\Admin\XClient.exe
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
PID:676

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

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\XClient.exe.log

Filesize
841B

MD5
0efd0cfcc86075d96e951890baf0fa87

SHA1
6e98c66d43aa3f01b2395048e754d69b7386b511

SHA256
ff981780f37479af6a428dd121eef68cf6e0b471ae92f080893a55320cc993f7

SHA512
4e79f5a8494aac94f98af8dbbc71bdd0a57b02103757ad970da7e7d4e6a0dc5015ca008256a6bd2c5bdec3a0f5736a994e17b3ef004b0f374a3339e480ac41b1

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

Filesize
256KB

MD5
8fdf47e0ff70c40ed3a17014aeea4232

SHA1
e6256a0159688f0560b015da4d967f41cbf8c9bd

SHA256
ed9884bac608c06b7057037cc91d90e4ae5f74dd2dbce2af476699c6d4492d82

SHA512
bd69d092ed4f9c5e1f24eaf5ec79fb316469d53849dc798fae0fcba5e90869b77ee924c23cc6f692198ff25827ab60ad47bb46cadd6e0aadde7731cbafb013be

Download Submit
memory/408-0-0x0000000000AC5000-0x0000000000AC6000-memory.dmp

Filesize
4KB

Download
memory/412-19-0x0000000074B00000-0x00000000752B0000-memory.dmp

Filesize
7.7MB

Download
memory/412-20-0x0000000074B00000-0x00000000752B0000-memory.dmp

Filesize
7.7MB

Download
memory/412-17-0x0000000074B00000-0x00000000752B0000-memory.dmp

Filesize
7.7MB

Download
memory/412-16-0x00000000054C0000-0x000000000561A000-memory.dmp

Filesize
1.4MB

Download
memory/412-15-0x0000000002D00000-0x0000000002D1A000-memory.dmp

Filesize
104KB

Download
memory/412-14-0x0000000000B30000-0x0000000000B70000-memory.dmp

Filesize
256KB

Download
memory/676-23-0x0000000074B00000-0x00000000752B0000-memory.dmp

Filesize
7.7MB

Download
memory/676-24-0x0000000074B00000-0x00000000752B0000-memory.dmp

Filesize
7.7MB

Download
memory/676-25-0x0000000074B00000-0x00000000752B0000-memory.dmp

Filesize
7.7MB

Download
memory/4344-3-0x0000000005360000-0x00000000053FC000-memory.dmp

Filesize
624KB

Download
memory/4344-10-0x0000000074B00000-0x00000000752B0000-memory.dmp

Filesize
7.7MB

Download
memory/4344-9-0x0000000074B0E000-0x0000000074B0F000-memory.dmp

Filesize
4KB

Download
memory/4344-2-0x0000000074B0E000-0x0000000074B0F000-memory.dmp

Filesize
4KB

Download
memory/4344-8-0x0000000074B00000-0x00000000752B0000-memory.dmp

Filesize
7.7MB

Download
memory/4344-1-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads