Analysis
- max time kernel
172s - max time network
193s - platform
windows10-2004_x64 - resource
win10v2004-20221111-en - resource tags
- submitted
01/12/2022, 04:33
General
- Target file.exe
- Size 2.1MB
- Sample221201-e6j7kseb32
- SHA256 5cd1e9031bb98118ff7d574b015a36a595867232d376ec9e7f43599c44bc3cda
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
- 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-MPIP5.tmp\is-B4T4F.tmp"C:\Users\Admin\AppData\Local\Temp\is-MPIP5.tmp\is-B4T4F.tmp" /SL4 $B01D2 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1949045 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
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\{6eb576c0-6208-11ed-9190-806e6f6e6963}\hkHJ7P.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
_iscrypt.dll
is-B4T4F.tmp
is-B4T4F.tmp
hkHJ7P.exe
hkHJ7P.exe
memory/2244-137-0x0000000000400000-0x0000000000413000-memory.dmp
memory/2244-132-0x0000000000400000-0x0000000000413000-memory.dmp
memory/3752-143-0x0000000000400000-0x0000000001535000-memory.dmp
memory/3752-142-0x0000000000400000-0x0000000001535000-memory.dmp
memory/3752-144-0x0000000000400000-0x0000000001535000-memory.dmp
memory/3752-145-0x0000000000400000-0x0000000001535000-memory.dmp
memory/3752-149-0x0000000010000000-0x000000001001B000-memory.dmp