xworm | 9e2cc1e98ba3672218c8fbdeb5c8831c340a25c4b425ee32bf45527577c8eb2c

General

Target

Realtek HD Audio Universal Service.exe
Size

40KB
MD5

876020bf5050a2b498b45cb65d89f067
SHA1

7f7ace329e3c77e14fc5bb11d1797e5f61f96859
SHA256

9e2cc1e98ba3672218c8fbdeb5c8831c340a25c4b425ee32bf45527577c8eb2c
SHA512

f168fe3bb22c1947036418737845c9200c5642fec69d24a982d47d2c0da9502e8e8e86268fae5c39f28ab8267fc4cb2644a9e27a4f8b898dfafd4c5b801fd7c0
SSDEEP

768:MBj78fx6MooenBjJfDUbtRFH9OKl6BOMhXL05jh:o78p6MLeBjJfIbDFH93l6BOMFkjh

Score

10^/10

xworm execution rat trojan

Malware Config

Extracted

Family

xworm

Version

5.0

C2

147.185.221.23:57069

Mutex

lW9cEvIRnaJBDeUt

Attributes

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

aes.plain

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral1/memory/2016-1-0x0000000000370000-0x0000000000380000-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
2644	powershell.exe
2580	powershell.exe
2748	powershell.exe
2908	powershell.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Realtek HD Audio Universal Service.lnk	Realtek HD Audio Universal Service.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Realtek HD Audio Universal Service.lnk	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
2748	powershell.exe
2908	powershell.exe
2644	powershell.exe
2580	powershell.exe
2016	Realtek HD Audio Universal Service.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	2016	Realtek HD Audio Universal Service.exe
Token: SeDebugPrivilege	2748	powershell.exe
Token: SeDebugPrivilege	2908	powershell.exe
Token: SeDebugPrivilege	2644	powershell.exe
Token: SeDebugPrivilege	2580	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2016	Realtek HD Audio Universal Service.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2016 wrote to memory of 2748	2016	Realtek HD Audio Universal Service.exe	32
PID 2016 wrote to memory of 2748	2016	Realtek HD Audio Universal Service.exe	32
PID 2016 wrote to memory of 2748	2016	Realtek HD Audio Universal Service.exe	32
PID 2016 wrote to memory of 2908	2016	Realtek HD Audio Universal Service.exe	34
PID 2016 wrote to memory of 2908	2016	Realtek HD Audio Universal Service.exe	34
PID 2016 wrote to memory of 2908	2016	Realtek HD Audio Universal Service.exe	34
PID 2016 wrote to memory of 2644	2016	Realtek HD Audio Universal Service.exe	36
PID 2016 wrote to memory of 2644	2016	Realtek HD Audio Universal Service.exe	36
PID 2016 wrote to memory of 2644	2016	Realtek HD Audio Universal Service.exe	36
PID 2016 wrote to memory of 2580	2016	Realtek HD Audio Universal Service.exe	38
PID 2016 wrote to memory of 2580	2016	Realtek HD Audio Universal Service.exe	38
PID 2016 wrote to memory of 2580	2016	Realtek HD Audio Universal Service.exe	38

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⤵
- Drops startup file
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2016
- 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:2748
- 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:2908
- 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:2644
- 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:2580

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
7KB

MD5
b5f6b137aeb533775905b764327723b7

SHA1
d70ba60467368db4b4e9ed76be3094644180153c

SHA256
37788a0f3f4a3c19f7ca9160721627f64ef6e3d9b4c17d58852dd6330e9a7a42

SHA512
429a4bce41005ef1fc4ee4dd108307a265322e316648c8e9414b4dbcf3a09e23e7a8b07be091c08c416ba620108d450e213348872dc9c1df028f89fe20669b4e

Download Submit
memory/2016-0-0x000007FEF5D23000-0x000007FEF5D24000-memory.dmp

Filesize
4KB

Download
memory/2016-1-0x0000000000370000-0x0000000000380000-memory.dmp

Filesize
64KB

Download
memory/2016-2-0x000007FEF5D20000-0x000007FEF670C000-memory.dmp

Filesize
9.9MB

Download
memory/2016-3-0x000007FEF5D23000-0x000007FEF5D24000-memory.dmp

Filesize
4KB

Download
memory/2016-4-0x000007FEF5D20000-0x000007FEF670C000-memory.dmp

Filesize
9.9MB

Download
memory/2748-9-0x0000000002A80000-0x0000000002B00000-memory.dmp

Filesize
512KB

Download
memory/2748-10-0x000000001B5F0000-0x000000001B8D2000-memory.dmp

Filesize
2.9MB

Download
memory/2748-11-0x0000000001E80000-0x0000000001E88000-memory.dmp

Filesize
32KB

Download
memory/2908-17-0x000000001B670000-0x000000001B952000-memory.dmp

Filesize
2.9MB

Download
memory/2908-18-0x0000000002790000-0x0000000002798000-memory.dmp

Filesize
32KB

Download

Analysis

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