Analysis
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max time kernel
19s -
max time network
22s -
platform
windows10-2004_x64 -
resource
win10v2004-20250217-en -
resource tags
arch:x64arch:x86image:win10v2004-20250217-enlocale:en-usos:windows10-2004-x64system -
submitted
26/02/2025, 22:16
Behavioral task
behavioral1
Sample
ByteZero.exe
Resource
win7-20240729-en
windows7-x64
0 signatures
150 seconds
Behavioral task
behavioral2
Sample
ByteZero.exe
Resource
win10v2004-20250217-en
windows10-2004-x64
9 signatures
150 seconds
General
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Target
ByteZero.exe
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Size
9.5MB
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MD5
df00bc36e9b00874ff8f495a29d9f429
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SHA1
3f3140a188943673e7b90b819005548042c9b675
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SHA256
27e10c80006f2080f85b3b9aff0d165044d1954385ea16d6e48dabaa6a1ec5af
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SHA512
c79ce66d9c73e64cc3060437bf9d2f9f3f17067b0e4ebb8b30d4863ec417ad1f95c315810168d34058f82804ca59a1d8f442d81c265e57dc330670025b152f88
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SSDEEP
98304:YVMHJFAvLQWabWp2le10+9XTA8E6oMsaSk5e/UI:PFAvLCev10+9DA16oM1e/UI
Score
10/10
Malware Config
Extracted
Family
skuld
C2
https://discord.com/api/webhooks/1260739914253991956/NKvC4KymlhPTNJNmbkQtDwm5AXdtAESkrV95KgMKN5kz9Z_06X949ZzR7jGGnoW0AnBX
Signatures
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Skuld family
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Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-2278412438-3475196406-3686434223-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Realtek HD Audio Universal Service = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Protect\\SecurityHealthSystray.exe" ByteZero.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 3 api.ipify.org 4 api.ipify.org 10 ip-api.com -
GoLang User-Agent 1 IoCs
Uses default user-agent string defined by GoLang HTTP packages.
description flow ioc HTTP User-Agent header 11 Go-http-client/1.1 -
Modifies system certificate store 2 TTPs 3 IoCs
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\B1BC968BD4F49D622AA89A81F2150152A41D829C ByteZero.exe Set value (data) \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\B1BC968BD4F49D622AA89A81F2150152A41D829C\Blob = 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 ByteZero.exe Set value (data) \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\B1BC968BD4F49D622AA89A81F2150152A41D829C\Blob = 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 ByteZero.exe -
Suspicious use of AdjustPrivilegeToken 43 IoCs
description pid Process Token: SeDebugPrivilege 1036 ByteZero.exe Token: SeIncreaseQuotaPrivilege 3736 wmic.exe Token: SeSecurityPrivilege 3736 wmic.exe Token: SeTakeOwnershipPrivilege 3736 wmic.exe Token: SeLoadDriverPrivilege 3736 wmic.exe Token: SeSystemProfilePrivilege 3736 wmic.exe Token: SeSystemtimePrivilege 3736 wmic.exe Token: SeProfSingleProcessPrivilege 3736 wmic.exe Token: SeIncBasePriorityPrivilege 3736 wmic.exe Token: SeCreatePagefilePrivilege 3736 wmic.exe Token: SeBackupPrivilege 3736 wmic.exe Token: SeRestorePrivilege 3736 wmic.exe Token: SeShutdownPrivilege 3736 wmic.exe Token: SeDebugPrivilege 3736 wmic.exe Token: SeSystemEnvironmentPrivilege 3736 wmic.exe Token: SeRemoteShutdownPrivilege 3736 wmic.exe Token: SeUndockPrivilege 3736 wmic.exe Token: SeManageVolumePrivilege 3736 wmic.exe Token: 33 3736 wmic.exe Token: 34 3736 wmic.exe Token: 35 3736 wmic.exe Token: 36 3736 wmic.exe Token: SeIncreaseQuotaPrivilege 3736 wmic.exe Token: SeSecurityPrivilege 3736 wmic.exe Token: SeTakeOwnershipPrivilege 3736 wmic.exe Token: SeLoadDriverPrivilege 3736 wmic.exe Token: SeSystemProfilePrivilege 3736 wmic.exe Token: SeSystemtimePrivilege 3736 wmic.exe Token: SeProfSingleProcessPrivilege 3736 wmic.exe Token: SeIncBasePriorityPrivilege 3736 wmic.exe Token: SeCreatePagefilePrivilege 3736 wmic.exe Token: SeBackupPrivilege 3736 wmic.exe Token: SeRestorePrivilege 3736 wmic.exe Token: SeShutdownPrivilege 3736 wmic.exe Token: SeDebugPrivilege 3736 wmic.exe Token: SeSystemEnvironmentPrivilege 3736 wmic.exe Token: SeRemoteShutdownPrivilege 3736 wmic.exe Token: SeUndockPrivilege 3736 wmic.exe Token: SeManageVolumePrivilege 3736 wmic.exe Token: 33 3736 wmic.exe Token: 34 3736 wmic.exe Token: 35 3736 wmic.exe Token: 36 3736 wmic.exe -
Suspicious use of WriteProcessMemory 6 IoCs
description pid Process procid_target PID 1036 wrote to memory of 3340 1036 ByteZero.exe 85 PID 1036 wrote to memory of 3340 1036 ByteZero.exe 85 PID 1036 wrote to memory of 2240 1036 ByteZero.exe 86 PID 1036 wrote to memory of 2240 1036 ByteZero.exe 86 PID 1036 wrote to memory of 3736 1036 ByteZero.exe 88 PID 1036 wrote to memory of 3736 1036 ByteZero.exe 88 -
Views/modifies file attributes 1 TTPs 2 IoCs
pid Process 3340 attrib.exe 2240 attrib.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\ByteZero.exe"C:\Users\Admin\AppData\Local\Temp\ByteZero.exe"1⤵
- Adds Run key to start application
- Modifies system certificate store
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1036 -
C:\Windows\system32\attrib.exeattrib +h +s C:\Users\Admin\AppData\Local\Temp\ByteZero.exe2⤵
- Views/modifies file attributes
PID:3340
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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:2240
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C:\Windows\System32\Wbem\wmic.exewmic csproduct get UUID2⤵
- Suspicious use of AdjustPrivilegeToken
PID:3736
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
9.5MB
MD5df00bc36e9b00874ff8f495a29d9f429
SHA13f3140a188943673e7b90b819005548042c9b675
SHA25627e10c80006f2080f85b3b9aff0d165044d1954385ea16d6e48dabaa6a1ec5af
SHA512c79ce66d9c73e64cc3060437bf9d2f9f3f17067b0e4ebb8b30d4863ec417ad1f95c315810168d34058f82804ca59a1d8f442d81c265e57dc330670025b152f88