Analysis
- max time kernel
91s - max time network
105s - platform
windows10-2004_x64 - resource
win10v2004-20220812-en - resource tags
- submitted
22/12/2022, 02:17
General
- Target file.exe
- Size 1.9MB
- Sample221222-cqqnbagh7y
- SHA256 01973747c271eb2994f866a6894fc729ee833258ed52a4e85c42dbef7bdf4b0c
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-KA44O.tmp\is-D9D4F.tmp"C:\Users\Admin\AppData\Local\Temp\is-KA44O.tmp\is-D9D4F.tmp" /SL4 $B017E "C:\Users\Admin\AppData\Local\Temp\file.exe" 1783182 3169282⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
-
C:\Program Files (x86)\Split Files\SplitFiles116.exe"C:\Program Files (x86)\Split Files\SplitFiles116.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}\1R0FJ.exe4⤵
- Executes dropped EXE
-
-
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles116.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles116.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\taskkill.exetaskkill /im "SplitFiles116.exe" /f5⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
-
-
-
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
SplitFiles116.exe
SplitFiles116.exe
_iscrypt.dll
is-D9D4F.tmp
is-D9D4F.tmp
1R0FJ.exe
1R0FJ.exe
memory/4208-143-0x0000000000400000-0x000000000154D000-memory.dmp
memory/4208-142-0x0000000000400000-0x000000000154D000-memory.dmp
memory/4208-147-0x0000000010000000-0x000000001001B000-memory.dmp
memory/4208-151-0x0000000000400000-0x000000000154D000-memory.dmp
memory/4208-154-0x0000000000400000-0x000000000154D000-memory.dmp
memory/4660-132-0x0000000000400000-0x0000000000454000-memory.dmp
memory/4660-136-0x0000000000400000-0x0000000000454000-memory.dmp
memory/4660-155-0x0000000000400000-0x0000000000454000-memory.dmp