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
behavioral4/memory/2292-1-0x0000000000110000-0x000000000012A000-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
2284	powershell.exe
3468	powershell.exe
3916	powershell.exe
4712	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-1-5-21-3350944739-639801879-157714471-1000\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-1-5-21-3350944739-639801879-157714471-1000\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
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
2284	powershell.exe
2284	powershell.exe
3468	powershell.exe
3468	powershell.exe
3916	powershell.exe
3916	powershell.exe
4712	powershell.exe
4712	powershell.exe
2292	Realtek HD Audio Universal Service.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	2292	Realtek HD Audio Universal Service.exe
Token: SeDebugPrivilege	2284	powershell.exe
Token: SeDebugPrivilege	3468	powershell.exe
Token: SeDebugPrivilege	3916	powershell.exe
Token: SeDebugPrivilege	4712	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2292	Realtek HD Audio Universal Service.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 2292 wrote to memory of 2284	2292	Realtek HD Audio Universal Service.exe	92
PID 2292 wrote to memory of 2284	2292	Realtek HD Audio Universal Service.exe	92
PID 2292 wrote to memory of 3468	2292	Realtek HD Audio Universal Service.exe	96
PID 2292 wrote to memory of 3468	2292	Realtek HD Audio Universal Service.exe	96
PID 2292 wrote to memory of 3916	2292	Realtek HD Audio Universal Service.exe	99
PID 2292 wrote to memory of 3916	2292	Realtek HD Audio Universal Service.exe	99
PID 2292 wrote to memory of 4712	2292	Realtek HD Audio Universal Service.exe	101
PID 2292 wrote to memory of 4712	2292	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:2292
- 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:2284
- 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:3468
- 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:3916
- 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:4712

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
2e907f77659a6601fcc408274894da2e

SHA1
9f5b72abef1cd7145bf37547cdb1b9254b4efe9d

SHA256
385da35673330e21ac02545220552fe301fe54dedefbdafc097ac4342a295233

SHA512
34fa0fff24f6550f55f828541aaefe5d75c86f8f0842d54b50065e9746f9662bb7209c74c9a9571540b9855bb3851f01db613190024e89b198d485bb5dc07721

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

Filesize
944B

MD5
da5c82b0e070047f7377042d08093ff4

SHA1
89d05987cd60828cca516c5c40c18935c35e8bd3

SHA256
77a94ef8c4258445d538a6006ffadb05afdf888f6f044e1e5466b981a07f16c5

SHA512
7360311a3c97b73dd3f6d7179cd979e0e20d69f380d38292447e17e369087d9dd5acb66cd0cbdd95ac4bfb16e5a1b86825f835a8d45b14ea9812102cff59704b

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

Filesize
944B

MD5
c70f5fdb5161c221cb8341f486091374

SHA1
3d815ce68a4272adeaafee14447b69620c4bb00b

SHA256
84f83d3986bf995a502114b318f7ad836701a9f0061a86bdc75573a18094f1f4

SHA512
0623e131bf69373cd84a54455ea7236817f8f32a75dd5490a0223ea48eac370968bc92df0156acdd97ab57acf9b418b42540d703cea2b3c3a92c2e99c327a973

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_egtrbu1r.pde.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/2284-3-0x00007FFA81940000-0x00007FFA82401000-memory.dmp

Filesize
10.8MB

Download
memory/2284-14-0x00007FFA81940000-0x00007FFA82401000-memory.dmp

Filesize
10.8MB

Download
memory/2284-15-0x00007FFA81940000-0x00007FFA82401000-memory.dmp

Filesize
10.8MB

Download
memory/2284-18-0x00007FFA81940000-0x00007FFA82401000-memory.dmp

Filesize
10.8MB

Download
memory/2284-9-0x00000145ABED0000-0x00000145ABEF2000-memory.dmp

Filesize
136KB

Download
memory/2292-0-0x00007FFA81943000-0x00007FFA81945000-memory.dmp

Filesize
8KB

Download
memory/2292-2-0x00007FFA81940000-0x00007FFA82401000-memory.dmp

Filesize
10.8MB

Download
memory/2292-1-0x0000000000110000-0x000000000012A000-memory.dmp

Filesize
104KB

Download
memory/2292-53-0x00007FFA81943000-0x00007FFA81945000-memory.dmp

Filesize
8KB

Download
memory/2292-55-0x00007FFA81940000-0x00007FFA82401000-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