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/548-1-0x0000000000100000-0x000000000011A000-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
2732	powershell.exe
2816	powershell.exe
1748	powershell.exe
2984	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-1-5-21-3290804112-2823094203-3137964600-1000\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
2732	powershell.exe
2816	powershell.exe
1748	powershell.exe
2984	powershell.exe
548	Realtek HD Audio Universal Service.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	548	Realtek HD Audio Universal Service.exe
Token: SeDebugPrivilege	2732	powershell.exe
Token: SeDebugPrivilege	2816	powershell.exe
Token: SeDebugPrivilege	1748	powershell.exe
Token: SeDebugPrivilege	2984	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
548	Realtek HD Audio Universal Service.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 548 wrote to memory of 2732	548	Realtek HD Audio Universal Service.exe	32
PID 548 wrote to memory of 2732	548	Realtek HD Audio Universal Service.exe	32
PID 548 wrote to memory of 2732	548	Realtek HD Audio Universal Service.exe	32
PID 548 wrote to memory of 2816	548	Realtek HD Audio Universal Service.exe	34
PID 548 wrote to memory of 2816	548	Realtek HD Audio Universal Service.exe	34
PID 548 wrote to memory of 2816	548	Realtek HD Audio Universal Service.exe	34
PID 548 wrote to memory of 1748	548	Realtek HD Audio Universal Service.exe	36
PID 548 wrote to memory of 1748	548	Realtek HD Audio Universal Service.exe	36
PID 548 wrote to memory of 1748	548	Realtek HD Audio Universal Service.exe	36
PID 548 wrote to memory of 2984	548	Realtek HD Audio Universal Service.exe	38
PID 548 wrote to memory of 2984	548	Realtek HD Audio Universal Service.exe	38
PID 548 wrote to memory of 2984	548	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⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:548
- 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:2732
- 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:2816
- 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:1748
- 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:2984

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
aa81ad737df44ea7c704529c59bcb85c

SHA1
809be64aa7ce953dd17d92d419ed7d056a5195f9

SHA256
8ebd5567f2bb87bb6badb77a48ca856c5b1e2c129e7fa9441b01927405bcba21

SHA512
e389e371a0742f34b5ff65e9d60efbe2df5b2a73caee548175b5a8ce274ce038e4bc98823522596d7ca4b9e14b0d14d11c5151b176dc8d6f10dc9ee8888fd8b4

Download Submit
memory/548-0-0x000007FEF5D23000-0x000007FEF5D24000-memory.dmp

Filesize
4KB

Download
memory/548-1-0x0000000000100000-0x000000000011A000-memory.dmp

Filesize
104KB

Download
memory/548-2-0x000007FEF5D20000-0x000007FEF670C000-memory.dmp

Filesize
9.9MB

Download
memory/548-27-0x000007FEF5D23000-0x000007FEF5D24000-memory.dmp

Filesize
4KB

Download
memory/548-29-0x000007FEF5D20000-0x000007FEF670C000-memory.dmp

Filesize
9.9MB

Download
memory/2732-7-0x0000000002B50000-0x0000000002BD0000-memory.dmp

Filesize
512KB

Download
memory/2732-8-0x000000001B570000-0x000000001B852000-memory.dmp

Filesize
2.9MB

Download
memory/2732-9-0x0000000001E00000-0x0000000001E08000-memory.dmp

Filesize
32KB

Download
memory/2816-15-0x000000001B7A0000-0x000000001BA82000-memory.dmp

Filesize
2.9MB

Download
memory/2816-16-0x0000000001E50000-0x0000000001E58000-memory.dmp

Filesize
32KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads