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
behavioral4/memory/1592-1-0x0000000000B00000-0x0000000000B14000-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
1512	powershell.exe
848	powershell.exe
1236	powershell.exe
3584	powershell.exe

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-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation	Realtek HD Audio Universal Service.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-1-5-21-1045960512-3948844814-3059691613-1000\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
14	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 9 IoCs

pid	Process
1512	powershell.exe
1512	powershell.exe
848	powershell.exe
848	powershell.exe
1236	powershell.exe
1236	powershell.exe
3584	powershell.exe
3584	powershell.exe
1592	Realtek HD Audio Universal Service.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	1592	Realtek HD Audio Universal Service.exe
Token: SeDebugPrivilege	1512	powershell.exe
Token: SeDebugPrivilege	848	powershell.exe
Token: SeDebugPrivilege	1236	powershell.exe
Token: SeDebugPrivilege	3584	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1592	Realtek HD Audio Universal Service.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1592 wrote to memory of 1512	1592	Realtek HD Audio Universal Service.exe	95
PID 1592 wrote to memory of 1512	1592	Realtek HD Audio Universal Service.exe	95
PID 1592 wrote to memory of 848	1592	Realtek HD Audio Universal Service.exe	97
PID 1592 wrote to memory of 848	1592	Realtek HD Audio Universal Service.exe	97
PID 1592 wrote to memory of 1236	1592	Realtek HD Audio Universal Service.exe	99
PID 1592 wrote to memory of 1236	1592	Realtek HD Audio Universal Service.exe	99
PID 1592 wrote to memory of 3584	1592	Realtek HD Audio Universal Service.exe	101
PID 1592 wrote to memory of 3584	1592	Realtek HD Audio Universal Service.exe	101

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⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1592
- 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:1512
- 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:848
- 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:1236
- 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:3584

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

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
cadef9abd087803c630df65264a6c81c

SHA1
babbf3636c347c8727c35f3eef2ee643dbcc4bd2

SHA256
cce65b73cdfe9304bcd5207913e8b60fb69faa20cd3b684f2b0343b755b99438

SHA512
7278aa87124abb382d9024a645e881e7b7cf1b84e8894943b36e018dbf0399e6858392f77980b599fa5488e2e21bf757a0702fe6419417edac93b68e0c2ec085

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
cae60f0ddddac635da71bba775a2c5b4

SHA1
386f1a036af61345a7d303d45f5230e2df817477

SHA256
b2dd636b7b0d3bfe44cef5e1175828b1fa7bd84d5563f54342944156ba996c16

SHA512
28ed8a8bc132ef56971cfd7b517b17cdb74a7f8c247ef6bff232996210075e06aa58a415825a1e038cfb547ad3dc6882bf1ca1b68c5b360ef0512a1440850253

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
4a4a983f3041e534fd0437ef18cc766f

SHA1
95b9588cbb6e2923a77be844f8fa0b89facef85e

SHA256
413948561f5e65d28641df742f64246dae04ed9a2b9657f1f810edf2d9c4ca7f

SHA512
f2deb4b030e09ecf72ac957f0f1cb77f03fa27578451bab12f932c2f4cdc8f9fa951271fca0a25eca35b2eec43a264d0010356c5248ab7274823aea5d86c6b2b

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_xl0pckkb.mji.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1512-13-0x000001FFEBBA0000-0x000001FFEBBC2000-memory.dmp

Filesize
136KB

Download
memory/1512-14-0x00007FFA10640000-0x00007FFA11101000-memory.dmp

Filesize
10.8MB

Download
memory/1512-15-0x00007FFA10640000-0x00007FFA11101000-memory.dmp

Filesize
10.8MB

Download
memory/1512-18-0x00007FFA10640000-0x00007FFA11101000-memory.dmp

Filesize
10.8MB

Download
memory/1512-12-0x00007FFA10640000-0x00007FFA11101000-memory.dmp

Filesize
10.8MB

Download
memory/1592-0-0x00007FFA10643000-0x00007FFA10645000-memory.dmp

Filesize
8KB

Download
memory/1592-2-0x00007FFA10640000-0x00007FFA11101000-memory.dmp

Filesize
10.8MB

Download
memory/1592-1-0x0000000000B00000-0x0000000000B14000-memory.dmp

Filesize
80KB

Download
memory/1592-54-0x00007FFA10643000-0x00007FFA10645000-memory.dmp

Filesize
8KB

Download
memory/1592-55-0x00007FFA10640000-0x00007FFA11101000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads