Analysis
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max time kernel
98s -
max time network
147s -
platform
windows10-2004_x64 -
resource
win10v2004-20231222-en -
resource tags
arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system -
submitted
24-12-2023 15:14
Static task
static1
Behavioral task
behavioral1
Sample
03482a7cae3d747392da697c2d04d281.dll
Resource
win7-20231215-en
Behavioral task
behavioral2
Sample
03482a7cae3d747392da697c2d04d281.dll
Resource
win10v2004-20231222-en
General
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Target
03482a7cae3d747392da697c2d04d281.dll
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Size
236KB
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MD5
03482a7cae3d747392da697c2d04d281
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SHA1
2fc5b184b3180ae0e46c99781932bc37a75e06dd
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SHA256
e8ce37ce99bae767df41c26f308bc9100b2074bb54d06af81706356cbcb2f434
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SHA512
4a426c9ac387708b43a839a688acc868b59c54a09a0a66f52d27ebc6d302ad8909c36e49a5b73a2e43fb65f6d8976ba324b01557aaac98ad8fd455688309406f
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SSDEEP
1536:1dKaTHN2ymZ0ofa5uQm4V7HG8ldINh+RhFtFftCgpcGO5lPf/XG8GmGwktbE:1Y4tIQG8XAmbFfaGc1fawk1E
Malware Config
Signatures
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Adds autorun key to be loaded by Explorer.exe on startup 2 TTPs 2 IoCs
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad rundll32.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad\efkaysfjq = "{c9a4a699-412c-9671-523d-412c2e11089a}" rundll32.exe -
Loads dropped DLL 1 IoCs
pid Process 744 rundll32.exe -
Drops file in System32 directory 4 IoCs
description ioc Process File created C:\Windows\SysWOW64\rsxnlfswd.dll rundll32.exe File opened for modification C:\Windows\SysWOW64\rsxnlfswd.dll rundll32.exe File created C:\Windows\SysWOW64\zafvtnael.dll rundll32.exe File opened for modification C:\Windows\SysWOW64\zafvtnael.dll rundll32.exe -
Modifies registry class 5 IoCs
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{c9a4a699-412c-9671-523d-412c2e11089a} rundll32.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{c9a4a699-412c-9671-523d-412c2e11089a}\ rundll32.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{c9a4a699-412c-9671-523d-412c2e11089a}\InprocServer32 rundll32.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{c9a4a699-412c-9671-523d-412c2e11089a}\InprocServer32\ = "C:\\Windows\\SysWow64\\zafvtnael.dll" rundll32.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{c9a4a699-412c-9671-523d-412c2e11089a}\InprocServer32\ThreadingModel = "Apartment" rundll32.exe -
Suspicious behavior: EnumeratesProcesses 2 IoCs
pid Process 744 rundll32.exe 744 rundll32.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
description pid Process Token: SeDebugPrivilege 744 rundll32.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 744 rundll32.exe -
Suspicious use of WriteProcessMemory 3 IoCs
description pid Process procid_target PID 4840 wrote to memory of 744 4840 rundll32.exe 88 PID 4840 wrote to memory of 744 4840 rundll32.exe 88 PID 4840 wrote to memory of 744 4840 rundll32.exe 88
Processes
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C:\Windows\system32\rundll32.exerundll32.exe C:\Users\Admin\AppData\Local\Temp\03482a7cae3d747392da697c2d04d281.dll,#11⤵
- Suspicious use of WriteProcessMemory
PID:4840 -
C:\Windows\SysWOW64\rundll32.exerundll32.exe C:\Users\Admin\AppData\Local\Temp\03482a7cae3d747392da697c2d04d281.dll,#12⤵
- Adds autorun key to be loaded by Explorer.exe on startup
- Loads dropped DLL
- Drops file in System32 directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
PID:744
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
478KB
MD5e99416267b61f52fa5ab994019efd359
SHA186d31eae707db7fe51d2556394fcf0e8e9f6b0fd
SHA256768c286674371564b5e6095edb56e0a4231f341be895da69cfccca5160029774
SHA5120a1c7579a9c787c2c1bef35f0660e72e74b42824e14ebea63b87ed25ddaf107e3746567bb431cab41a2f6719fad2c22d96e0715a1fe085d75805d7d66f7f05ae