Analysis
- max time kernel
205s - max time network
220s - platform
windows10-2004_x64 - resource
win10v2004-20221111-en - resource tags
- submitted
03/12/2022, 04:48
General
- Target file.exe
- Size 3.6MB
- Sample221203-fe4ycaad6s
- SHA256 8c01415e7b5299090789321ac15cfa3bf42358e691f104f6697da2aa7ddefd6f
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.
- Suspicious behavior: EnumeratesProcesses 6 IoCs
- Suspicious behavior: GetForegroundWindowSpam 1 IoCs
- Suspicious use of WriteProcessMemory 12 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-GOKG9.tmp\is-3SSR3.tmp"C:\Users\Admin\AppData\Local\Temp\is-GOKG9.tmp\is-3SSR3.tmp" /SL4 $B004C "C:\Users\Admin\AppData\Local\Temp\file.exe" 3555505 517122⤵
- 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 behavior: GetForegroundWindowSpam
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\{6eb576c0-6208-11ed-9190-806e6f6e6963}\pQzxkALogG.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⤵
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
PrintFolders.exe
PrintFolders.exe
is-3SSR3.tmp
is-3SSR3.tmp
_iscrypt.dll
pQzxkALogG.exe
pQzxkALogG.exe
memory/2504-149-0x0000000010000000-0x000000001001B000-memory.dmp
memory/2504-143-0x0000000000400000-0x00000000017EF000-memory.dmp
memory/2504-144-0x0000000000400000-0x00000000017EF000-memory.dmp
memory/2504-145-0x0000000000400000-0x00000000017EF000-memory.dmp
memory/2504-153-0x0000000000400000-0x00000000017EF000-memory.dmp
memory/2504-155-0x0000000000400000-0x00000000017EF000-memory.dmp
memory/4524-139-0x0000000000400000-0x0000000000413000-memory.dmp
memory/4524-134-0x0000000000400000-0x0000000000413000-memory.dmp
memory/4524-132-0x0000000000400000-0x0000000000413000-memory.dmp