Analysis
- max time kernel
91s - max time network
150s - platform
windows10-2004_x64 - resource
win10v2004-20220901-en - resource tags
- submitted
13/11/2022, 01:04
General
- Target file.exe
- Size 2.9MB
- Sample221113-bex3ksaa97
- SHA256 36984883d35263ce3f0dce1903de5bd50da1df815e86b58c2e31e5b6bdd0c74f
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 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-P0UFI.tmp\is-O0F2P.tmp"C:\Users\Admin\AppData\Local\Temp\is-P0UFI.tmp\is-O0F2P.tmp" /SL4 $8004A "C:\Users\Admin\AppData\Local\Temp\file.exe" 2744761 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)\gfSearcher\gfsearcher77.exe"C:\Program Files (x86)\gfSearcher\gfsearcher77.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\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\TjTBOvVvOx3RV.exe4⤵
- Executes dropped EXE
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "gfsearcher77.exe" /f & erase "C:\Program Files (x86)\gfSearcher\gfsearcher77.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "gfsearcher77.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
gfsearcher77.exe
gfsearcher77.exe
_iscrypt.dll
is-O0F2P.tmp
is-O0F2P.tmp
TjTBOvVvOx3RV.exe
TjTBOvVvOx3RV.exe
memory/1192-148-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1192-152-0x0000000000400000-0x000000000166B000-memory.dmp
memory/1192-142-0x0000000000400000-0x000000000166B000-memory.dmp
memory/1192-143-0x0000000000400000-0x000000000166B000-memory.dmp
memory/1192-144-0x0000000000400000-0x000000000166B000-memory.dmp
memory/1192-155-0x0000000000400000-0x000000000166B000-memory.dmp
memory/4884-132-0x0000000000400000-0x0000000000414000-memory.dmp
memory/4884-138-0x0000000000400000-0x0000000000414000-memory.dmp
memory/4884-156-0x0000000000400000-0x0000000000414000-memory.dmp