Analysis
- max time kernel
169s - max time network
174s - platform
windows10-2004_x64 - resource
win10v2004-20220812-en - resource tags
- submitted
06/12/2022, 12:02
General
- Target file.exe
- Size 3.6MB
- Sample221206-n7fp8aae2x
- SHA256 99eed97fa236da51cf743e89a7bccf89f16e2da53934b8f5c9897dec6bcfdf91
Malware Config
Extracted
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nymaim
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45.139.105.171
-
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
- 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 9 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-D3UMB.tmp\is-RSJVL.tmp"C:\Users\Admin\AppData\Local\Temp\is-D3UMB.tmp\is-RSJVL.tmp" /SL4 $90064 "C:\Users\Admin\AppData\Local\Temp\file.exe" 3505908 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
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\En1vqh5FsHf.exe4⤵
- Executes dropped EXE
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
PrintFolders.exe
PrintFolders.exe
is-RSJVL.tmp
is-RSJVL.tmp
_iscrypt.dll
En1vqh5FsHf.exe
En1vqh5FsHf.exe
memory/3940-132-0x0000000000400000-0x000000000041E000-memory.dmp
memory/3940-135-0x0000000000400000-0x000000000041E000-memory.dmp
memory/4372-143-0x0000000000400000-0x0000000001810000-memory.dmp
memory/4372-142-0x0000000000400000-0x0000000001810000-memory.dmp
memory/4372-144-0x0000000000400000-0x0000000001810000-memory.dmp
memory/4372-148-0x0000000000400000-0x0000000001810000-memory.dmp
memory/4372-149-0x0000000010000000-0x000000001001B000-memory.dmp