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Analysis
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max time kernel
118s -
max time network
119s -
platform
windows7_x64 -
resource
win7-20231129-en -
resource tags
arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system -
submitted
25/12/2023, 10:05
Static task
static1
Behavioral task
behavioral1
Sample
15f4b6ff3ff656fbe205618a25c5fc3c.dll
Resource
win7-20231129-en
Behavioral task
behavioral2
Sample
15f4b6ff3ff656fbe205618a25c5fc3c.dll
Resource
win10v2004-20231222-en
General
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Target
15f4b6ff3ff656fbe205618a25c5fc3c.dll
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Size
236KB
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MD5
15f4b6ff3ff656fbe205618a25c5fc3c
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SHA1
d0c443afb91af5cd8bbd4bcebc1c9652f6622be9
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SHA256
51a129086b973f6bae1bed13d9baf7796be82f59e407fb5a59d3936a31830690
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SHA512
dcb9b6fbf5e2202592c30c4286eee51a5f03f85be886860398411c63b7cecd153144236d568411b4898786d0ce86106569bedfaa47959c1bd19867dfbde55392
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SSDEEP
3072:SeqmgHwlaazN9U3J+P0wFp+bLrt2wkkIT:+Qj9U3jwO3rt5I
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\eks = "{8a87694d-020f-5754-1310-020fe1c5ee8b}" rundll32.exe -
Loads dropped DLL 1 IoCs
pid Process 2548 rundll32.exe -
Drops file in System32 directory 4 IoCs
description ioc Process File created C:\Windows\SysWOW64\rxf.dll rundll32.exe File opened for modification C:\Windows\SysWOW64\rxf.dll rundll32.exe File created C:\Windows\SysWOW64\zfn.dll rundll32.exe File opened for modification C:\Windows\SysWOW64\zfn.dll rundll32.exe -
Modifies registry class 5 IoCs
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{8a87694d-020f-5754-1310-020fe1c5ee8b} rundll32.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{8a87694d-020f-5754-1310-020fe1c5ee8b}\ rundll32.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{8a87694d-020f-5754-1310-020fe1c5ee8b}\InprocServer32 rundll32.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{8a87694d-020f-5754-1310-020fe1c5ee8b}\InprocServer32\ = "C:\\Windows\\SysWow64\\zfn.dll" rundll32.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{8a87694d-020f-5754-1310-020fe1c5ee8b}\InprocServer32\ThreadingModel = "Apartment" rundll32.exe -
Suspicious behavior: EnumeratesProcesses 1 IoCs
pid Process 2548 rundll32.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
description pid Process Token: SeDebugPrivilege 2548 rundll32.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 2548 rundll32.exe -
Suspicious use of WriteProcessMemory 7 IoCs
description pid Process procid_target PID 3024 wrote to memory of 2548 3024 rundll32.exe 17 PID 3024 wrote to memory of 2548 3024 rundll32.exe 17 PID 3024 wrote to memory of 2548 3024 rundll32.exe 17 PID 3024 wrote to memory of 2548 3024 rundll32.exe 17 PID 3024 wrote to memory of 2548 3024 rundll32.exe 17 PID 3024 wrote to memory of 2548 3024 rundll32.exe 17 PID 3024 wrote to memory of 2548 3024 rundll32.exe 17
Processes
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C:\Windows\system32\rundll32.exerundll32.exe C:\Users\Admin\AppData\Local\Temp\15f4b6ff3ff656fbe205618a25c5fc3c.dll,#11⤵
- Suspicious use of WriteProcessMemory
PID:3024 -
C:\Windows\SysWOW64\rundll32.exerundll32.exe C:\Users\Admin\AppData\Local\Temp\15f4b6ff3ff656fbe205618a25c5fc3c.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:2548
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
625KB
MD595e2376b3323f062eb562b8586d0f14a
SHA1453d4c3bf4a489433b593420a37bbffb7749875a
SHA256bd3fa8750123d00aa0967fba44372c46ea002681da9c9b77a4f9261553e26017
SHA512b898603d07a49237e4dfc6872d5caa7616bae1258926f10e66c4d3f0d81cccefac1e844395b65bb1f308fbc022061b52e51f60658d0a546c04b365b3428cc87d