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Analysis
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max time kernel
133s -
max time network
150s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system -
submitted
13/11/2024, 14:02
Behavioral task
behavioral1
Sample
Realtek HD Audio Universal Service.exe
Resource
win7-20240903-en
General
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Target
Realtek HD Audio Universal Service.exe
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Size
40KB
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MD5
876020bf5050a2b498b45cb65d89f067
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SHA1
7f7ace329e3c77e14fc5bb11d1797e5f61f96859
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SHA256
9e2cc1e98ba3672218c8fbdeb5c8831c340a25c4b425ee32bf45527577c8eb2c
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SHA512
f168fe3bb22c1947036418737845c9200c5642fec69d24a982d47d2c0da9502e8e8e86268fae5c39f28ab8267fc4cb2644a9e27a4f8b898dfafd4c5b801fd7c0
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SSDEEP
768:MBj78fx6MooenBjJfDUbtRFH9OKl6BOMhXL05jh:o78p6MLeBjJfIbDFH93l6BOMFkjh
Malware Config
Extracted
xworm
5.0
147.185.221.23:57069
lW9cEvIRnaJBDeUt
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Install_directory
%LocalAppData%
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install_file
Realtek HD Audio Universal Service.exe
Signatures
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Detect Xworm Payload 1 IoCs
resource yara_rule behavioral2/memory/2864-1-0x0000000000620000-0x0000000000630000-memory.dmp family_xworm -
Xworm family
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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.
pid Process 2840 powershell.exe 1616 powershell.exe 3284 powershell.exe 1056 powershell.exe -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-3227495264-2217614367-4027411560-1000\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 3 ip-api.com -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Suspicious behavior: EnumeratesProcesses 9 IoCs
pid Process 2840 powershell.exe 2840 powershell.exe 1616 powershell.exe 1616 powershell.exe 3284 powershell.exe 3284 powershell.exe 1056 powershell.exe 1056 powershell.exe 2864 Realtek HD Audio Universal Service.exe -
Suspicious use of AdjustPrivilegeToken 5 IoCs
description pid Process Token: SeDebugPrivilege 2864 Realtek HD Audio Universal Service.exe Token: SeDebugPrivilege 2840 powershell.exe Token: SeDebugPrivilege 1616 powershell.exe Token: SeDebugPrivilege 3284 powershell.exe Token: SeDebugPrivilege 1056 powershell.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 2864 Realtek HD Audio Universal Service.exe -
Suspicious use of WriteProcessMemory 8 IoCs
description pid Process procid_target PID 2864 wrote to memory of 2840 2864 Realtek HD Audio Universal Service.exe 88 PID 2864 wrote to memory of 2840 2864 Realtek HD Audio Universal Service.exe 88 PID 2864 wrote to memory of 1616 2864 Realtek HD Audio Universal Service.exe 90 PID 2864 wrote to memory of 1616 2864 Realtek HD Audio Universal Service.exe 90 PID 2864 wrote to memory of 3284 2864 Realtek HD Audio Universal Service.exe 92 PID 2864 wrote to memory of 3284 2864 Realtek HD Audio Universal Service.exe 92 PID 2864 wrote to memory of 1056 2864 Realtek HD Audio Universal Service.exe 94 PID 2864 wrote to memory of 1056 2864 Realtek HD Audio Universal Service.exe 94
Processes
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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:2864 -
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:2840
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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:1616
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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:3284
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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:1056
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
2KB
MD5d85ba6ff808d9e5444a4b369f5bc2730
SHA131aa9d96590fff6981b315e0b391b575e4c0804a
SHA25684739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f
SHA5128c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249
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Filesize
944B
MD52e907f77659a6601fcc408274894da2e
SHA19f5b72abef1cd7145bf37547cdb1b9254b4efe9d
SHA256385da35673330e21ac02545220552fe301fe54dedefbdafc097ac4342a295233
SHA51234fa0fff24f6550f55f828541aaefe5d75c86f8f0842d54b50065e9746f9662bb7209c74c9a9571540b9855bb3851f01db613190024e89b198d485bb5dc07721
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Filesize
944B
MD5d2cfcaec8842041e069da07ebdf9ad1f
SHA1000d391e61cafe523f535e3b206835bbfc96299b
SHA256d9c1757a17a04213e3ea02d33192563cbbd1ac94e33228278dc3577c589a0fd3
SHA51241b337225bd920fa14b0b7045b6050c60c97cb2e73937993bfcac780dfc40ec5cc80bc770f74ef9bef6cbc30df446355b6c63a5ce0918bcd21a382f32fc31546
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Filesize
944B
MD5cc19bcff372d20459d3651ba8aef50e7
SHA13c6f1d4cdd647864fb97a16b1aefba67fcee11f7
SHA256366473e774d8976c7fd4dc582220666fb61a4feb3f7c95e69b2a68ad9e446ec9
SHA512a0e360ca4b6e874fd44612bf4b17f3722c0619da4f6bade12a62efadae88c2d33460114eaafa2bc3fb1cef5bea07e745b8bee24f15d0cacaff5f4a521b225080
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Filesize
60B
MD5d17fe0a3f47be24a6453e9ef58c94641
SHA16ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA25696ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA5125b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82