Analysis
- max time kernel
173s - max time network
182s - platform
windows10-2004_x64 - resource
win10v2004-20220812-en - resource tags
- submitted
14/10/2022, 05:02
General
- Target file.exe
- Size 2.4MB
- Sample221014-fn4zpshca2
- SHA256 c3b94ad0e86ebe52db19e2229ef0aef94ea63b8a663f17becc880a415371d353
Malware Config
Extracted
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nymaim
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45.15.156.54
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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 12 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-DOKH0.tmp\is-LBHBO.tmp"C:\Users\Admin\AppData\Local\Temp\is-DOKH0.tmp\is-LBHBO.tmp" /SL4 $B002C "C:\Users\Admin\AppData\Local\Temp\file.exe" 2291872 527362⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
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C:\Program Files (x86)\dxSearcher\dxsearcher48.exe"C:\Program Files (x86)\dxSearcher\dxsearcher48.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\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\WFNj09IqJ7lpqD.exe4⤵
- Executes dropped EXE
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "dxsearcher48.exe" /f & erase "C:\Program Files (x86)\dxSearcher\dxsearcher48.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "dxsearcher48.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
dxsearcher48.exe
dxsearcher48.exe
is-LBHBO.tmp
is-LBHBO.tmp
_iscrypt.dll
WFNj09IqJ7lpqD.exe
WFNj09IqJ7lpqD.exe
memory/2052-139-0x0000000000400000-0x0000000000414000-memory.dmp
memory/2052-157-0x0000000000400000-0x0000000000414000-memory.dmp
memory/2052-132-0x0000000000400000-0x0000000000414000-memory.dmp
memory/2052-134-0x0000000000400000-0x0000000000414000-memory.dmp
memory/3144-143-0x0000000000400000-0x00000000015F9000-memory.dmp
memory/3144-145-0x0000000000400000-0x00000000015F9000-memory.dmp
memory/3144-144-0x0000000000400000-0x00000000015F9000-memory.dmp
memory/3144-149-0x0000000010000000-0x000000001001B000-memory.dmp
memory/3144-153-0x0000000000400000-0x00000000015F9000-memory.dmp
memory/3144-156-0x0000000000400000-0x00000000015F9000-memory.dmp