xworm | 1133b725403821998bc9750d965d028ae078a3cc8d6014cbf231f7fb40a14f92

Reason

Machine shutdown

General

Target

Steam Servers Starter.exe
Size

328KB
MD5

118058cb2e49ff809845d5543a8ee5c8
SHA1

f7289d94b973fcbe0a064ed798c9328abecffca0
SHA256

1133b725403821998bc9750d965d028ae078a3cc8d6014cbf231f7fb40a14f92
SHA512

594bc589ca60bd653fabf72c34fb7e69de25643cbe19bbe1ed5e406390d7b6ac58c7adf76d66fc22d998b35bcfa5e0b07932aa6b73aee8cab1c277301c71bbf4
SSDEEP

6144:rWBIIzFb83+GIIIIIIIhIIIIIIIIIIIIIIIU:qBIUi4

Score

10^/10

xworm persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

vshostupdater.duckdns.org:1177

http://vshostupdater.duckdns.org:1177

189.14.62.242:1177

192.168.1.6:1177

Attributes

Install_directory
%AppData%
install_file
svhostupdt.exe

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral1/memory/460-1-0x0000000000690000-0x00000000006E8000-memory.dmp	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-1-5-21-3495501434-311648039-2993076821-1000\Control Panel\International\Geo\Nation	Steam Servers Starter.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Steam Servers Starter.lnk	Steam Servers Starter.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Steam Servers Starter.lnk	Steam Servers Starter.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-1-5-21-3495501434-311648039-2993076821-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Steam Servers Starter = "C:\\Users\\Admin\\AppData\\Roaming\\Steam Servers Starter"	Steam Servers Starter.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Modifies data under HKEY_USERS 15 IoCs

description	ioc	Process
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4288567808"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "22"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent	LogonUI.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = a6d8ff0076b9ed00429ce3000078d700005a9e000042750000264200f7630c00	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10"	LogonUI.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
3480	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
460	Steam Servers Starter.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	460	Steam Servers Starter.exe
Token: SeDebugPrivilege	460	Steam Servers Starter.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
460	Steam Servers Starter.exe
3712	LogonUI.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 460 wrote to memory of 3480	460	Steam Servers Starter.exe	85
PID 460 wrote to memory of 3480	460	Steam Servers Starter.exe	85

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\Steam Servers Starter.exe
"C:\Users\Admin\AppData\Local\Temp\Steam Servers Starter.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:460
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Steam Servers Starter" /tr "C:\Users\Admin\AppData\Roaming\Steam Servers Starter"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3480

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x4 /state0:0xa3a1f055 /state1:0x41c64e6d
1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:3712

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

memory/460-0-0x00007FFD3A233000-0x00007FFD3A235000-memory.dmp

Filesize
8KB

Download
memory/460-1-0x0000000000690000-0x00000000006E8000-memory.dmp

Filesize
352KB

Download
memory/460-5-0x00007FFD3A230000-0x00007FFD3ACF2000-memory.dmp

Filesize
10.8MB

Download
memory/460-6-0x00007FFD3A233000-0x00007FFD3A235000-memory.dmp

Filesize
8KB

Download
memory/460-7-0x00007FFD3A230000-0x00007FFD3ACF2000-memory.dmp

Filesize
10.8MB

Download
memory/460-8-0x00007FFD3A230000-0x00007FFD3ACF2000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

Errors

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads