Analysis
- max time kernel
119s - max time network
127s - platform
windows10-2004_x64 - resource
win10v2004-20220901-en - resource tags
- submitted
04/11/2022, 00:02
General
- Target file.exe
- Size 2.8MB
- Sample221104-abf48ahac7
- SHA256 913ec221d7f29571c9102264cc3168975a3fa3f395d602daaf6836e68bdbfd0c
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-ROSUO.tmp\is-L6SQD.tmp"C:\Users\Admin\AppData\Local\Temp\is-ROSUO.tmp\is-L6SQD.tmp" /SL4 $10006C "C:\Users\Admin\AppData\Local\Temp\file.exe" 2736056 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)\fnSearcher\fnsearcher68.exe"C:\Program Files (x86)\fnSearcher\fnsearcher68.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}\KYLCzG.exe4⤵
- Executes dropped EXE
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "fnsearcher68.exe" /f & erase "C:\Program Files (x86)\fnSearcher\fnsearcher68.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "fnsearcher68.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
fnsearcher68.exe
fnsearcher68.exe
_iscrypt.dll
is-L6SQD.tmp
is-L6SQD.tmp
KYLCzG.exe
KYLCzG.exe
memory/408-148-0x0000000010000000-0x000000001001B000-memory.dmp
memory/408-152-0x0000000000400000-0x0000000001670000-memory.dmp
memory/408-142-0x0000000000400000-0x0000000001670000-memory.dmp
memory/408-143-0x0000000000400000-0x0000000001670000-memory.dmp
memory/408-144-0x0000000000400000-0x0000000001670000-memory.dmp
memory/408-155-0x0000000000400000-0x0000000001670000-memory.dmp
memory/3068-132-0x0000000000400000-0x0000000000414000-memory.dmp
memory/3068-138-0x0000000000400000-0x0000000000414000-memory.dmp
memory/3068-156-0x0000000000400000-0x0000000000414000-memory.dmp