Analysis
- max time kernel
90s - max time network
154s - platform
windows10-2004_x64 - resource
win10v2004-20221111-en - resource tags
- submitted
28/01/2023, 04:32
General
- Target file.exe
- Size 2.3MB
- Sample230128-e5ynksfe9t
- SHA256 a507bf6f4f3ce30224821394e81efa4ec284f41b31084a56ee1163b0eca0ad85
Malware Config
Extracted
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gcleaner
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45.12.253.56
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45.12.253.72
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45.12.253.98
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45.12.253.75
Signatures
- GCleaner
GCleaner is a Pay-Per-Install malware loader first discovered in early 2019.
- Executes dropped EXE 3 IoCs
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Loads dropped DLL 3 IoCs
- Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- Drops file in Program Files directory 9 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Kills process with taskkill 1 IoCs
- Suspicious behavior: EnumeratesProcesses 6 IoCs
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of WriteProcessMemory 15 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\file.exe"C:\Users\Admin\AppData\Local\Temp\file.exe"1⤵
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\is-5EECL.tmp\file.tmp"C:\Users\Admin\AppData\Local\Temp\is-5EECL.tmp\file.tmp" /SL5="$D003C,2116328,135168,C:\Users\Admin\AppData\Local\Temp\file.exe"2⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
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C:\Program Files (x86)\FgdsoftFR\FinalRecovery\finalrecovery.exe"C:\Program Files (x86)\FgdsoftFR\FinalRecovery\finalrecovery.exe"3⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\{6e1ce040-6208-11ed-b5ce-806e6f6e6963}\5zmyUx6su5Y.exe4⤵
- Executes dropped EXE
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "finalrecovery.exe" /f & erase "C:\Program Files (x86)\FgdsoftFR\FinalRecovery\finalrecovery.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "finalrecovery.exe" /f5⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
finalrecovery.exe
finalrecovery.exe
file.tmp
file.tmp
_iscrypt.dll
_isdecmp.dll
_isdecmp.dll
5zmyUx6su5Y.exe
5zmyUx6su5Y.exe
memory/1368-150-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1368-154-0x0000000000400000-0x00000000013D5000-memory.dmp
memory/1368-145-0x0000000000400000-0x00000000013D5000-memory.dmp
memory/1368-146-0x0000000000400000-0x00000000013D5000-memory.dmp
memory/1368-157-0x0000000000400000-0x00000000013D5000-memory.dmp
memory/2260-153-0x0000000000400000-0x0000000000428000-memory.dmp
memory/2260-132-0x0000000000400000-0x0000000000428000-memory.dmp
memory/2260-137-0x0000000000400000-0x0000000000428000-memory.dmp
memory/2260-158-0x0000000000400000-0x0000000000428000-memory.dmp
memory/3360-140-0x00000000023C1000-0x00000000023C3000-memory.dmp