Analysis
- max time kernel
90s - max time network
150s - platform
windows10-2004_x64 - resource
win10v2004-20221111-en - resource tags
- submitted
23/12/2022, 05:16
General
- Target file.exe
- Size 2.0MB
- Sample221223-fx5mlaba9v
- SHA256 6b27aecd127da414437282906e7b742996015c5377f90e5e4548bd62fc85ca84
Malware Config
Extracted
-
nymaim
-
45.139.105.171
-
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
-
C:\Users\Admin\AppData\Local\Temp\file.exe"C:\Users\Admin\AppData\Local\Temp\file.exe"1⤵
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\Temp\is-83MB9.tmp\is-8JR2T.tmp"C:\Users\Admin\AppData\Local\Temp\is-83MB9.tmp\is-8JR2T.tmp" /SL4 $9004E "C:\Users\Admin\AppData\Local\Temp\file.exe" 1798793 1331202⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
-
C:\Program Files (x86)\Split Files\SplitFiles118.exe"C:\Program Files (x86)\Split Files\SplitFiles118.exe"3⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Roaming\{6e1ce040-6208-11ed-b5ce-806e6f6e6963}\udzeGaXkIP.exe4⤵
- Executes dropped EXE
-
-
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles118.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles118.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\taskkill.exetaskkill /im "SplitFiles118.exe" /f5⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
-
-
-
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
SplitFiles118.exe
SplitFiles118.exe
is-8JR2T.tmp
is-8JR2T.tmp
_iscrypt.dll
udzeGaXkIP.exe
udzeGaXkIP.exe
memory/4424-156-0x0000000000400000-0x0000000000427000-memory.dmp
memory/4424-132-0x0000000000400000-0x0000000000427000-memory.dmp
memory/4424-135-0x0000000000400000-0x0000000000427000-memory.dmp
memory/5024-142-0x0000000000400000-0x000000000154D000-memory.dmp
memory/5024-148-0x0000000010000000-0x000000001001B000-memory.dmp
memory/5024-152-0x0000000000400000-0x000000000154D000-memory.dmp
memory/5024-144-0x0000000000400000-0x000000000154D000-memory.dmp
memory/5024-143-0x0000000000400000-0x000000000154D000-memory.dmp
memory/5024-155-0x0000000000400000-0x000000000154D000-memory.dmp