Analysis
- max time kernel
91s - max time network
106s - platform
windows10-2004_x64 - resource
win10v2004-20220812-en - resource tags
- submitted
05/01/2023, 15:16
General
- Target file.exe
- Size 1.9MB
- Sample230105-snfnbscd92
- SHA256 e671bd3f3c41e302c56d9ea334119b0e76e8efab053118230f7c326f12db3478
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-SG3R2.tmp\is-P8NM1.tmp"C:\Users\Admin\AppData\Local\Temp\is-SG3R2.tmp\is-P8NM1.tmp" /SL4 $1201C8 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1671870 1704962⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
-
C:\Program Files (x86)\Split Files\SplitFiles131.exe"C:\Program Files (x86)\Split Files\SplitFiles131.exe"3⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\6JJzqVVWxbXqx.exe4⤵
- Executes dropped EXE
-
-
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles131.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles131.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\taskkill.exetaskkill /im "SplitFiles131.exe" /f5⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
-
-
-
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
SplitFiles131.exe
SplitFiles131.exe
_iscrypt.dll
is-P8NM1.tmp
is-P8NM1.tmp
6JJzqVVWxbXqx.exe
6JJzqVVWxbXqx.exe
memory/1504-156-0x0000000000400000-0x0000000000430000-memory.dmp
memory/1504-137-0x0000000000400000-0x0000000000430000-memory.dmp
memory/1504-132-0x0000000000400000-0x0000000000430000-memory.dmp
memory/2828-143-0x0000000000400000-0x0000000001526000-memory.dmp
memory/2828-144-0x0000000000400000-0x0000000001526000-memory.dmp
memory/2828-142-0x0000000000400000-0x0000000001526000-memory.dmp
memory/2828-148-0x0000000010000000-0x000000001001B000-memory.dmp
memory/2828-152-0x0000000000400000-0x0000000001526000-memory.dmp
memory/2828-155-0x0000000000400000-0x0000000001526000-memory.dmp