Analysis
- max time kernel
69s - max time network
135s - platform
windows10-2004_x64 - resource
win10v2004-20220812-en - resource tags
- submitted
06/12/2022, 05:48
General
- Target file.exe
- Size 3.6MB
- Sample221206-ghfklada41
- SHA256 77f0902547bb3e19296ea3743c0b5b29f044e6305d9465f74ed2357f2b678e1a
Malware Config
Extracted
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nymaim
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45.139.105.171
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85.31.46.167
Signatures
- NyMaim
NyMaim is a malware with various capabilities written in C++ and first seen in 2013.
- 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 1 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-2PQI7.tmp\is-AVAE8.tmp"C:\Users\Admin\AppData\Local\Temp\is-2PQI7.tmp\is-AVAE8.tmp" /SL4 $C01CC "C:\Users\Admin\AppData\Local\Temp\file.exe" 3514187 962562⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
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C:\Program Files (x86)\PrintFolders\PrintFolders.exe"C:\Program Files (x86)\PrintFolders\PrintFolders.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\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\6uJGKbjpxLl6ti.exe4⤵
- Executes dropped EXE
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "PrintFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\PrintFolders.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "PrintFolders.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
PrintFolders.exe
PrintFolders.exe
is-AVAE8.tmp
is-AVAE8.tmp
_iscrypt.dll
6uJGKbjpxLl6ti.exe
6uJGKbjpxLl6ti.exe
memory/3444-139-0x0000000000400000-0x000000000041E000-memory.dmp
memory/3444-132-0x0000000000400000-0x000000000041E000-memory.dmp
memory/3444-134-0x0000000000400000-0x000000000041E000-memory.dmp
memory/3444-157-0x0000000000400000-0x000000000041E000-memory.dmp
memory/5104-144-0x0000000000400000-0x0000000001810000-memory.dmp
memory/5104-145-0x0000000000400000-0x0000000001810000-memory.dmp
memory/5104-143-0x0000000000400000-0x0000000001810000-memory.dmp
memory/5104-149-0x0000000010000000-0x000000001001B000-memory.dmp
memory/5104-153-0x0000000000400000-0x0000000001810000-memory.dmp
memory/5104-156-0x0000000000400000-0x0000000001810000-memory.dmp