Analysis
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max time kernel
61s -
max time network
70s -
platform
windows11-21h2_x64 -
resource
win11-20241007-en -
resource tags
arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system -
submitted
12-10-2024 12:08
Behavioral task
behavioral1
Sample
skuld.exe
Resource
win11-20241007-en
windows11-21h2-x64
8 signatures
150 seconds
General
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Target
skuld.exe
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Size
14.2MB
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MD5
3eb420ceca33cebdf59e96abd6ba75a3
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SHA1
fbd442d69323445e9ecedbe820c61fbac7fdb287
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SHA256
774c71f4e65a17cc744e906660435598f9b62dfdd599e9babbed3dd9dea32e53
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SHA512
06047f5492f785bb672c6059ef2b0f31855a63d4e91a41c9e8178d4958c5e50825433a4f8cd87e1aaf4be56492d9f86eccdbe9cf9ed3929621005636f591ee69
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SSDEEP
196608:5ADrfDmwoUoG3n5OJG1Nf0k7Ma/rkFlgdTaUrPPbdf5:5A3faw+JG1KkSFCdTauZR
Score
10/10
Malware Config
Signatures
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Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-3973800497-2716210218-310192997-1000\Software\Microsoft\Windows\CurrentVersion\Run\Realtek HD Audio Universal Service = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Protect\\SecurityHealthSystray.exe" skuld.exe -
Looks up external IP address via web service 3 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
flow ioc 1 api.ipify.org 1 ip-api.com 2 api.ipify.org -
GoLang User-Agent 1 IoCs
Uses default user-agent string defined by GoLang HTTP packages.
description flow ioc HTTP User-Agent header 3 Go-http-client/1.1 -
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\B1BC968BD4F49D622AA89A81F2150152A41D829C skuld.exe Set value (data) \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\B1BC968BD4F49D622AA89A81F2150152A41D829C\Blob = 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 skuld.exe Set value (data) \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\B1BC968BD4F49D622AA89A81F2150152A41D829C\Blob = 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 skuld.exe -
Suspicious use of AdjustPrivilegeToken 43 IoCs
description pid Process Token: SeDebugPrivilege 3396 skuld.exe Token: SeIncreaseQuotaPrivilege 5996 wmic.exe Token: SeSecurityPrivilege 5996 wmic.exe Token: SeTakeOwnershipPrivilege 5996 wmic.exe Token: SeLoadDriverPrivilege 5996 wmic.exe Token: SeSystemProfilePrivilege 5996 wmic.exe Token: SeSystemtimePrivilege 5996 wmic.exe Token: SeProfSingleProcessPrivilege 5996 wmic.exe Token: SeIncBasePriorityPrivilege 5996 wmic.exe Token: SeCreatePagefilePrivilege 5996 wmic.exe Token: SeBackupPrivilege 5996 wmic.exe Token: SeRestorePrivilege 5996 wmic.exe Token: SeShutdownPrivilege 5996 wmic.exe Token: SeDebugPrivilege 5996 wmic.exe Token: SeSystemEnvironmentPrivilege 5996 wmic.exe Token: SeRemoteShutdownPrivilege 5996 wmic.exe Token: SeUndockPrivilege 5996 wmic.exe Token: SeManageVolumePrivilege 5996 wmic.exe Token: 33 5996 wmic.exe Token: 34 5996 wmic.exe Token: 35 5996 wmic.exe Token: 36 5996 wmic.exe Token: SeIncreaseQuotaPrivilege 5996 wmic.exe Token: SeSecurityPrivilege 5996 wmic.exe Token: SeTakeOwnershipPrivilege 5996 wmic.exe Token: SeLoadDriverPrivilege 5996 wmic.exe Token: SeSystemProfilePrivilege 5996 wmic.exe Token: SeSystemtimePrivilege 5996 wmic.exe Token: SeProfSingleProcessPrivilege 5996 wmic.exe Token: SeIncBasePriorityPrivilege 5996 wmic.exe Token: SeCreatePagefilePrivilege 5996 wmic.exe Token: SeBackupPrivilege 5996 wmic.exe Token: SeRestorePrivilege 5996 wmic.exe Token: SeShutdownPrivilege 5996 wmic.exe Token: SeDebugPrivilege 5996 wmic.exe Token: SeSystemEnvironmentPrivilege 5996 wmic.exe Token: SeRemoteShutdownPrivilege 5996 wmic.exe Token: SeUndockPrivilege 5996 wmic.exe Token: SeManageVolumePrivilege 5996 wmic.exe Token: 33 5996 wmic.exe Token: 34 5996 wmic.exe Token: 35 5996 wmic.exe Token: 36 5996 wmic.exe -
Suspicious use of WriteProcessMemory 6 IoCs
description pid Process procid_target PID 3396 wrote to memory of 5332 3396 skuld.exe 78 PID 3396 wrote to memory of 5332 3396 skuld.exe 78 PID 3396 wrote to memory of 1920 3396 skuld.exe 79 PID 3396 wrote to memory of 1920 3396 skuld.exe 79 PID 3396 wrote to memory of 5996 3396 skuld.exe 80 PID 3396 wrote to memory of 5996 3396 skuld.exe 80 -
Views/modifies file attributes 1 TTPs 2 IoCs
pid Process 5332 attrib.exe 1920 attrib.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\skuld.exe"C:\Users\Admin\AppData\Local\Temp\skuld.exe"1⤵
- Adds Run key to start application
- Modifies system certificate store
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3396 -
C:\Windows\system32\attrib.exeattrib +h +s C:\Users\Admin\AppData\Local\Temp\skuld.exe2⤵
- Views/modifies file attributes
PID:5332
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C:\Windows\system32\attrib.exeattrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe2⤵
- Views/modifies file attributes
PID:1920
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C:\Windows\System32\Wbem\wmic.exewmic csproduct get UUID2⤵
- Suspicious use of AdjustPrivilegeToken
PID:5996
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C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k LocalService -p -s NPSMSvc1⤵PID:2492
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
14.2MB
MD53eb420ceca33cebdf59e96abd6ba75a3
SHA1fbd442d69323445e9ecedbe820c61fbac7fdb287
SHA256774c71f4e65a17cc744e906660435598f9b62dfdd599e9babbed3dd9dea32e53
SHA51206047f5492f785bb672c6059ef2b0f31855a63d4e91a41c9e8178d4958c5e50825433a4f8cd87e1aaf4be56492d9f86eccdbe9cf9ed3929621005636f591ee69