xworm | 132936f10f4245a94e6fc13084b5cbecf2c5462bd9217050dabfb65e17605869

Analysis

max time kernel
137s
max time network
145s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
18/11/2024, 18:48

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General

Target

Realtek HD Audio Universal Service.exe
Size

40KB
MD5

a29cf6541896f5be39c930c3737ff80c
SHA1

526d9571e0368b6d02130d98af32561024fdb803
SHA256

75abe13c29ec2a3a864d07299830be43502cb654bc1309b20e94c786fcc38631
SHA512

e883bce9aabd5999ba363eeb7260dedd08e5e7099a27d6132b93e1c1f83358613c1aea34ad90656f53c36295c1fab3eda2cfa75cb5bf1048813ad586d6ba8b3b
SSDEEP

768:QBj78fx6MooenBjJfDUbtRFH9OKw6BOMhtL05jP:U78p6MLeBjJfIbDFH93w6BOMTkjP

Score

10^/10

xworm execution rat trojan

Malware Config

Extracted

Family

xworm

Version

5.0

147.185.221.23:53638

Mutex

Itj6uNzPbdGmJ8JP

Attributes

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

aes.plain

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral8/memory/3644-1-0x0000000000DB0000-0x0000000000DC0000-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
3836	powershell.exe
3932	powershell.exe
1584	powershell.exe
1912	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-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	Realtek HD Audio Universal Service.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
11	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
1584	powershell.exe
1584	powershell.exe
1912	powershell.exe
1912	powershell.exe
3836	powershell.exe
3836	powershell.exe
3932	powershell.exe
3932	powershell.exe
3644	Realtek HD Audio Universal Service.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	3644	Realtek HD Audio Universal Service.exe
Token: SeDebugPrivilege	1584	powershell.exe
Token: SeDebugPrivilege	1912	powershell.exe
Token: SeDebugPrivilege	3836	powershell.exe
Token: SeDebugPrivilege	3932	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3644	Realtek HD Audio Universal Service.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 3644 wrote to memory of 1584	3644	Realtek HD Audio Universal Service.exe	94
PID 3644 wrote to memory of 1584	3644	Realtek HD Audio Universal Service.exe	94
PID 3644 wrote to memory of 1912	3644	Realtek HD Audio Universal Service.exe	96
PID 3644 wrote to memory of 1912	3644	Realtek HD Audio Universal Service.exe	96
PID 3644 wrote to memory of 3836	3644	Realtek HD Audio Universal Service.exe	100
PID 3644 wrote to memory of 3836	3644	Realtek HD Audio Universal Service.exe	100
PID 3644 wrote to memory of 3932	3644	Realtek HD Audio Universal Service.exe	102
PID 3644 wrote to memory of 3932	3644	Realtek HD Audio Universal Service.exe	102

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
- Drops startup file
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3644
- 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:1584
- 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:1912
- 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:3836
- 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:3932

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

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
3a6bad9528f8e23fb5c77fbd81fa28e8

SHA1
f127317c3bc6407f536c0f0600dcbcf1aabfba36

SHA256
986366767de5873f1b170a63f2a33ce05132d1afd90c8f5017afbca8ef1beb05

SHA512
846002154a0ece6f3e9feda6f115d3161dc21b3789525dd62ae1d9188495171293efdbe7be4710666dd8a15e66b557315b5a02918a741ed1d5f3ff0c515b98e2

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

Filesize
944B

MD5
9bc110200117a3752313ca2acaf8a9e1

SHA1
fda6b7da2e7b0175b391475ca78d1b4cf2147cd3

SHA256
c88e4bbb64f7fa31429ebe82c1cf07785c44486f37576f783a26ac856e02a4eb

SHA512
1f1af32aa18a8cbfcc65b0d4fb7e6ca2705f125eaa85789e981ee68b90c64522e954825abf460d4b4f97567715dfae8d9b0a25a4d54d10bc4c257c472f2e80fb

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

Filesize
944B

MD5
ef72c47dbfaae0b9b0d09f22ad4afe20

SHA1
5357f66ba69b89440b99d4273b74221670129338

SHA256
692ec20c7039170fb199510f0436181fd155e6b4516d4d1c9e1675adf99aaa7f

SHA512
7514b6bc8dc39fa618223300be27cd535dc35b18c66b4a089e2302e72b3e0cac06d88a989fa1296feb386b3cbe2084019df6430c7f895071b76e04ce559a30b4

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_uzytbcyi.1tl.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1584-10-0x00000250744C0000-0x00000250744E2000-memory.dmp

Filesize
136KB

Download
memory/1584-15-0x00007FFA473E0000-0x00007FFA47EA1000-memory.dmp

Filesize
10.8MB

Download
memory/1584-18-0x00007FFA473E0000-0x00007FFA47EA1000-memory.dmp

Filesize
10.8MB

Download
memory/1584-4-0x00007FFA473E0000-0x00007FFA47EA1000-memory.dmp

Filesize
10.8MB

Download
memory/1584-3-0x00007FFA473E0000-0x00007FFA47EA1000-memory.dmp

Filesize
10.8MB

Download
memory/3644-0-0x00007FFA473E3000-0x00007FFA473E5000-memory.dmp

Filesize
8KB

Download
memory/3644-2-0x00007FFA473E0000-0x00007FFA47EA1000-memory.dmp

Filesize
10.8MB

Download
memory/3644-42-0x00007FFA473E3000-0x00007FFA473E5000-memory.dmp

Filesize
8KB

Download
memory/3644-1-0x0000000000DB0000-0x0000000000DC0000-memory.dmp

Filesize
64KB

Download
memory/3644-58-0x00007FFA473E0000-0x00007FFA47EA1000-memory.dmp

Filesize
10.8MB

Download