Analysis
- max time kernel
157s - max time network
165s - platform
windows10_x64 - resource
win10-en-20211208 - submitted
12/01/2022, 18:44
General
- Target 9733-619.xlsm
- Size 84KB
- Sample220112-xdgj4adfc9
- SHA256 4ba298f5eb285e1caf8eec898984ac6cd199b8311648d62aaece404c80edf321
Malware Config
Extracted
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xlm4.0
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xlm40.dropper
http://insertcatherreview.xyz/wp-includes/o23k5ted/
Signatures
- Process spawned unexpected child process 1 IoCs
This typically indicates the parent process was compromised via an exploit or macro.
- Loads dropped DLL 2 IoCs
- Drops file in System32 directory 1 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Checks processor information in registry 2 TTPs 3 IoCs
Processor information is often read in order to detect sandboxing environments.
- Enumerates system info in registry 2 TTPs 3 IoCs
- Suspicious behavior: AddClipboardFormatListener 1 IoCs
- Suspicious use of SetWindowsHookEx 12 IoCs
- Suspicious use of WriteProcessMemory 9 IoCs
Processes
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C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\9733-619.xlsm"1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWow64\rundll32.exeC:\Windows\SysWow64\rundll32.exe ..\adi.ocx,D"&"l"&"lR"&"egister"&"Serve"&"r2⤵
- Process spawned unexpected child process
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\rundll32.exeC:\Windows\SysWOW64\rundll32.exe "C:\Users\Admin\adi.ocx",DllRegisterServer3⤵
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\rundll32.exeC:\Windows\SysWOW64\rundll32.exe "C:\Windows\SysWOW64\Rjuekhzdrz\yndfaadbhi.mkb",eIUhiGW4⤵
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
memory/920-122-0x000001EE51E20000-0x000001EE51E22000-memory.dmp
memory/920-118-0x00007FFB83070000-0x00007FFB83080000-memory.dmp
memory/920-123-0x000001EE51E20000-0x000001EE51E22000-memory.dmp
memory/920-124-0x00007FFB83070000-0x00007FFB83080000-memory.dmp
memory/920-125-0x000001EE51E20000-0x000001EE51E22000-memory.dmp
memory/920-121-0x00007FFB83070000-0x00007FFB83080000-memory.dmp
memory/920-120-0x00007FFB83070000-0x00007FFB83080000-memory.dmp
memory/920-119-0x00007FFB83070000-0x00007FFB83080000-memory.dmp
memory/3756-271-0x0000000000B60000-0x0000000000B89000-memory.dmp
memory/3984-272-0x0000000000A10000-0x0000000000B5A000-memory.dmp