xworm | 3ac3efee88adab86a250a53dd9448453fcc4223662f5c6c21453606b6eb91b77

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/4836-1-0x00000000005F0000-0x0000000000604000-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
4552	powershell.exe
3252	powershell.exe
1836	powershell.exe
5028	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-1-5-21-2878641211-696417878-3864914810-1000\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-1-5-21-2878641211-696417878-3864914810-1000\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
17	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
4552	powershell.exe
4552	powershell.exe
3252	powershell.exe
3252	powershell.exe
1836	powershell.exe
1836	powershell.exe
5028	powershell.exe
5028	powershell.exe
4836	Realtek HD Audio Universal Service.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	4836	Realtek HD Audio Universal Service.exe
Token: SeDebugPrivilege	4552	powershell.exe
Token: SeDebugPrivilege	3252	powershell.exe
Token: SeDebugPrivilege	1836	powershell.exe
Token: SeDebugPrivilege	5028	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4836	Realtek HD Audio Universal Service.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4836 wrote to memory of 4552	4836	Realtek HD Audio Universal Service.exe	88
PID 4836 wrote to memory of 4552	4836	Realtek HD Audio Universal Service.exe	88
PID 4836 wrote to memory of 3252	4836	Realtek HD Audio Universal Service.exe	92
PID 4836 wrote to memory of 3252	4836	Realtek HD Audio Universal Service.exe	92
PID 4836 wrote to memory of 1836	4836	Realtek HD Audio Universal Service.exe	94
PID 4836 wrote to memory of 1836	4836	Realtek HD Audio Universal Service.exe	94
PID 4836 wrote to memory of 5028	4836	Realtek HD Audio Universal Service.exe	98
PID 4836 wrote to memory of 5028	4836	Realtek HD Audio Universal Service.exe	98

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:4836
- 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:4552
- 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:3252
- 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:1836
- 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:5028

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
5a1eeec361ba5d0671ba459c85a6e1d7

SHA1
a51cdcd13a6b13e842a2ee977f6d1091d63d706f

SHA256
8804fca07f0a87233d848fc260b92e03567ecbee6f903fa0594cb78b11730174

SHA512
c41e69d0485c031e49d2505bf531579134147d983d19c3d7d5e3c8f7f6eea5441c830c3eda0f396b54737f30157c9543b68901a79e919ab9f6cc93e6beea345e

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

Filesize
944B

MD5
ba169f4dcbbf147fe78ef0061a95e83b

SHA1
92a571a6eef49fff666e0f62a3545bcd1cdcda67

SHA256
5ef1421e19fde4bc03cd825dd7d6c0e7863f85fd8f0aa4a4d4f8d555dc7606d1

SHA512
8d2e5e552210dcda684682538bc964fdd8a8ff5b24cc2cc8af813729f0202191f98eb42d38d2355df17ae620fe401aad6ceaedaed3b112fdacd32485a3a0c07c

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

Filesize
944B

MD5
d8cb3e9459807e35f02130fad3f9860d

SHA1
5af7f32cb8a30e850892b15e9164030a041f4bd6

SHA256
2b139c74072ccbdaa17b950f32a6dbc934dfb7af9973d97c9b0d9c498012ba68

SHA512
045239ba31367fbdd59e883f74eafc05724e23bd6e8f0c1e7171ea2496a497eb9e0cfcb57285bb81c4d569daadba43d6ef64c626ca48f1e2a59e8d97f0cc9184

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_rwdlt0tc.acl.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/4552-5-0x00007FFAD9D80000-0x00007FFADA841000-memory.dmp

Filesize
10.8MB

Download
memory/4552-15-0x00007FFAD9D80000-0x00007FFADA841000-memory.dmp

Filesize
10.8MB

Download
memory/4552-18-0x00007FFAD9D80000-0x00007FFADA841000-memory.dmp

Filesize
10.8MB

Download
memory/4552-3-0x00007FFAD9D80000-0x00007FFADA841000-memory.dmp

Filesize
10.8MB

Download
memory/4552-4-0x0000018A4C8C0000-0x0000018A4C8E2000-memory.dmp

Filesize
136KB

Download
memory/4836-0-0x00007FFAD9D83000-0x00007FFAD9D85000-memory.dmp

Filesize
8KB

Download
memory/4836-2-0x00007FFAD9D80000-0x00007FFADA841000-memory.dmp

Filesize
10.8MB

Download
memory/4836-1-0x00000000005F0000-0x0000000000604000-memory.dmp

Filesize
80KB

Download
memory/4836-53-0x00007FFAD9D83000-0x00007FFAD9D85000-memory.dmp

Filesize
8KB

Download
memory/4836-55-0x00007FFAD9D80000-0x00007FFADA841000-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