Analysis
- max time kernel
90s - max time network
94s - platform
windows10-2004_x64 - resource
win10v2004-20221111-en - resource tags
- submitted
06/01/2023, 10:02
General
- Target file.exe
- Size 1.8MB
- Sample230106-l2s29aff65
- SHA256 4cc90f23f20ec979721464c8bd4ddd04573bb2db1faacfc424ac25fb93590a6d
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 17 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-C5EQC.tmp\is-DL5S9.tmp"C:\Users\Admin\AppData\Local\Temp\is-C5EQC.tmp\is-DL5S9.tmp" /SL4 $C01CA "C:\Users\Admin\AppData\Local\Temp\file.exe" 1606258 967682⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
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C:\Program Files (x86)\Split Files\PlitFiles132.exe"C:\Program Files (x86)\Split Files\PlitFiles132.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}\pz9lyseGhS3o5.exe4⤵
- Executes dropped EXE
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "PlitFiles132.exe" /f & erase "C:\Program Files (x86)\Split Files\PlitFiles132.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "PlitFiles132.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
PlitFiles132.exe
PlitFiles132.exe
_iscrypt.dll
is-DL5S9.tmp
is-DL5S9.tmp
pz9lyseGhS3o5.exe
pz9lyseGhS3o5.exe
memory/1336-132-0x0000000000400000-0x000000000041E000-memory.dmp
memory/1336-155-0x0000000000400000-0x000000000041E000-memory.dmp
memory/1336-138-0x0000000000400000-0x000000000041E000-memory.dmp
memory/4520-143-0x0000000000400000-0x0000000001514000-memory.dmp
memory/4520-147-0x0000000010000000-0x000000001001B000-memory.dmp
memory/4520-151-0x0000000000400000-0x0000000001514000-memory.dmp
memory/4520-142-0x0000000000400000-0x0000000001514000-memory.dmp
memory/4520-154-0x0000000000400000-0x0000000001514000-memory.dmp