xworm | b50d25c24ba5f1f096e883b3a9970d2c080afb37dfe2f55a25a1c7ed3ca36505

General

Target

Realtek HD Audio Universal Service.exe
Size

79KB
MD5

066d90fb1d671648842a3b46622eb7ce
SHA1

6d0949bd4f494c9f8d80b705a79cfa9038c80e51
SHA256

8d2cf02c3005fb4bb7058df1f3a2e24b98077a8c5a8aab5c8184f4aa9ed951d8
SHA512

b22c8910e501de5fcb8e6197552396285366c9b43c4c6df4387b95a28830bf13a6ce634aadbf79e71b83879d19132c63414da5c5059edaa33be6bb71cee32745
SSDEEP

1536:vxgta4sqc5BlZof4KeyzFil9Xsbtlk+JggTaCL6UkLOJmxH3:pnqCTa4KTEnsbtmTgT1hkOJw3

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

147.185.221.23:25808

Attributes

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

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral3/memory/2200-1-0x0000000000020000-0x000000000003A000-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
2900	powershell.exe
2776	powershell.exe
2772	powershell.exe
2720	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-1-5-21-3692679935-4019334568-335155002-1000\Software\Microsoft\Windows\CurrentVersion\Run\Realtek HD Audio Universal Service = "C:\\Users\\Admin\\AppData\\Local\\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
2900	powershell.exe
2776	powershell.exe
2772	powershell.exe
2720	powershell.exe
2200	Realtek HD Audio Universal Service.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	2200	Realtek HD Audio Universal Service.exe
Token: SeDebugPrivilege	2900	powershell.exe
Token: SeDebugPrivilege	2776	powershell.exe
Token: SeDebugPrivilege	2772	powershell.exe
Token: SeDebugPrivilege	2720	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2200	Realtek HD Audio Universal Service.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2200 wrote to memory of 2900	2200	Realtek HD Audio Universal Service.exe	30
PID 2200 wrote to memory of 2900	2200	Realtek HD Audio Universal Service.exe	30
PID 2200 wrote to memory of 2900	2200	Realtek HD Audio Universal Service.exe	30
PID 2200 wrote to memory of 2776	2200	Realtek HD Audio Universal Service.exe	32
PID 2200 wrote to memory of 2776	2200	Realtek HD Audio Universal Service.exe	32
PID 2200 wrote to memory of 2776	2200	Realtek HD Audio Universal Service.exe	32
PID 2200 wrote to memory of 2772	2200	Realtek HD Audio Universal Service.exe	34
PID 2200 wrote to memory of 2772	2200	Realtek HD Audio Universal Service.exe	34
PID 2200 wrote to memory of 2772	2200	Realtek HD Audio Universal Service.exe	34
PID 2200 wrote to memory of 2720	2200	Realtek HD Audio Universal Service.exe	36
PID 2200 wrote to memory of 2720	2200	Realtek HD Audio Universal Service.exe	36
PID 2200 wrote to memory of 2720	2200	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:2200
- 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:2900
- 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:2776
- 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\Realtek HD Audio Universal Service.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2772
- 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:2720

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

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Downloads

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

Filesize
7KB

MD5
3421e1db590731def6ec1a7b02a21abb

SHA1
2b69177c40a1534c644152842cb318a0f7def310

SHA256
538fd9dd65dee4dbc05e7823b6588e3b606fce0c281d881a9d2ad65be7d83ed5

SHA512
2d8601ac59afd5406c5ada8757dc9f37b224e2fe71aa87fd7516137f60d77a708c061ed277115f0c38f7dc4055865f0ea8dace47a45eef382ea28dd3dd26684e

Download Submit
memory/2200-0-0x000007FEF6003000-0x000007FEF6004000-memory.dmp

Filesize
4KB

Download
memory/2200-1-0x0000000000020000-0x000000000003A000-memory.dmp

Filesize
104KB

Download
memory/2200-2-0x000007FEF6000000-0x000007FEF69EC000-memory.dmp

Filesize
9.9MB

Download
memory/2200-16-0x000007FEF6003000-0x000007FEF6004000-memory.dmp

Filesize
4KB

Download
memory/2200-29-0x000007FEF6000000-0x000007FEF69EC000-memory.dmp

Filesize
9.9MB

Download
memory/2776-14-0x000000001B280000-0x000000001B562000-memory.dmp

Filesize
2.9MB

Download
memory/2776-15-0x0000000002310000-0x0000000002318000-memory.dmp

Filesize
32KB

Download
memory/2900-7-0x000000001B1C0000-0x000000001B4A2000-memory.dmp

Filesize
2.9MB

Download
memory/2900-8-0x0000000002650000-0x0000000002658000-memory.dmp

Filesize
32KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads