xworm | 83b5438b0b9aebf778440dcb77eb52b0231133487bdb3b372a91523505ab63c2

General

Target

Realtek HD Audio Universal Service.exe
Size

53KB
MD5

ce3e5f8613ea049b651549eba3e3aa28
SHA1

1197375be314ae5a69f3b742f0f539b881aca09a
SHA256

9385116a4a3874548ffa027f4cd448d860ef8dc13fc687ce87790a01ede8e73a
SHA512

ab1428177b5ec71447003ac01f5f99d9c7f2af634f17ef53d6f6be196714faac856b0bc3f62b6fad9975dad970ec247d35f56615c62b9ad483426f4ecaae71c2
SSDEEP

768:/63AQe9cfNbv5s7Xol68y+JN/Db3dLPowu7aR6vaTOouhIZqklm:/WAQbdvoolZJ9b3dLPoCR68OnkZ8

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

147.185.221.23:58112

Attributes

Install_directory
%AppData%
install_file
Realtek HD Audio Universal Service.exe

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral3/memory/2796-1-0x0000000000F00000-0x0000000000F14000-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
2412	powershell.exe
1676	powershell.exe
2788	powershell.exe
2636	powershell.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-1-5-21-1488793075-819845221-1497111674-1000\Software\Microsoft\Windows\CurrentVersion\Run\Realtek HD Audio Universal Service = "C:\\Users\\Admin\\AppData\\Roaming\\Realtek HD Audio Universal Service.exe"	Realtek HD Audio Universal Service.exe

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

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2636	powershell.exe
2412	powershell.exe
1676	powershell.exe
2788	powershell.exe
2796	Realtek HD Audio Universal Service.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	2796	Realtek HD Audio Universal Service.exe
Token: SeDebugPrivilege	2636	powershell.exe
Token: SeDebugPrivilege	2412	powershell.exe
Token: SeDebugPrivilege	1676	powershell.exe
Token: SeDebugPrivilege	2788	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2796	Realtek HD Audio Universal Service.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2796 wrote to memory of 2636	2796	Realtek HD Audio Universal Service.exe	30
PID 2796 wrote to memory of 2636	2796	Realtek HD Audio Universal Service.exe	30
PID 2796 wrote to memory of 2636	2796	Realtek HD Audio Universal Service.exe	30
PID 2796 wrote to memory of 2412	2796	Realtek HD Audio Universal Service.exe	32
PID 2796 wrote to memory of 2412	2796	Realtek HD Audio Universal Service.exe	32
PID 2796 wrote to memory of 2412	2796	Realtek HD Audio Universal Service.exe	32
PID 2796 wrote to memory of 1676	2796	Realtek HD Audio Universal Service.exe	34
PID 2796 wrote to memory of 1676	2796	Realtek HD Audio Universal Service.exe	34
PID 2796 wrote to memory of 1676	2796	Realtek HD Audio Universal Service.exe	34
PID 2796 wrote to memory of 2788	2796	Realtek HD Audio Universal Service.exe	36
PID 2796 wrote to memory of 2788	2796	Realtek HD Audio Universal Service.exe	36
PID 2796 wrote to memory of 2788	2796	Realtek HD Audio Universal Service.exe	36

C:\Users\Admin\AppData\Local\Temp\Realtek HD Audio Universal Service.exe
"C:\Users\Admin\AppData\Local\Temp\Realtek HD Audio Universal Service.exe"
1⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2796
- 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\Realtek HD Audio Universal Service.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2636
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Realtek HD Audio Universal Service.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2412
- 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\Realtek HD Audio Universal Service.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1676
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Realtek HD Audio Universal Service.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2788

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
401a883d87569134a8ed869be7aeab43

SHA1
7cd052be5b8e3d8eb4cb43e3e88fe68fc28254a1

SHA256
a28c3e5f34941c69eb4c3ec98ac63538b3aaa40af38e049a96c12f87faf9286b

SHA512
cfcf1f744e484880cb7a4476ffadf95ded21b1a7f4155eecf07ae645ecfd6d37f58ca2ea21d8648254933dd0352b4dff0c62f3055a1d1f13cd4ec9cc94ea21f5

Download Submit
memory/2412-16-0x0000000001E10000-0x0000000001E18000-memory.dmp

Filesize
32KB

Download
memory/2412-15-0x000000001B760000-0x000000001BA42000-memory.dmp

Filesize
2.9MB

Download
memory/2636-7-0x0000000002B80000-0x0000000002C00000-memory.dmp

Filesize
512KB

Download
memory/2636-8-0x000000001B660000-0x000000001B942000-memory.dmp

Filesize
2.9MB

Download
memory/2636-9-0x00000000022C0000-0x00000000022C8000-memory.dmp

Filesize
32KB

Download
memory/2796-0-0x000007FEF57E3000-0x000007FEF57E4000-memory.dmp

Filesize
4KB

Download
memory/2796-1-0x0000000000F00000-0x0000000000F14000-memory.dmp

Filesize
80KB

Download
memory/2796-2-0x000007FEF57E0000-0x000007FEF61CC000-memory.dmp

Filesize
9.9MB

Download
memory/2796-27-0x000007FEF57E3000-0x000007FEF57E4000-memory.dmp

Filesize
4KB

Download
memory/2796-29-0x000007FEF57E0000-0x000007FEF61CC000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads