Analysis
- max time kernel
91s - max time network
152s - platform
windows10-2004_x64 - resource
win10v2004-20221111-en - resource tags
- submitted
23/12/2022, 01:46
General
- Target file.exe
- Size 1.8MB
- Sample221223-b6y4ysff44
- SHA256 691ff95223c2b3ebf506c212d8124b2e95d36615212b9dc0bd2d2d6c0ef0cbd1
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-BPGP2.tmp\is-AKUQH.tmp"C:\Users\Admin\AppData\Local\Temp\is-BPGP2.tmp\is-AKUQH.tmp" /SL4 $A004E "C:\Users\Admin\AppData\Local\Temp\file.exe" 1648331 1331202⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
-
C:\Program Files (x86)\Split Files\SplitFiles117.exe"C:\Program Files (x86)\Split Files\SplitFiles117.exe"3⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Roaming\{6eb576c0-6208-11ed-9190-806e6f6e6963}\VmOum2BPCL.exe4⤵
- Executes dropped EXE
-
-
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles117.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles117.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\taskkill.exetaskkill /im "SplitFiles117.exe" /f5⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
-
-
-
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
SplitFiles117.exe
SplitFiles117.exe
is-AKUQH.tmp
is-AKUQH.tmp
_iscrypt.dll
VmOum2BPCL.exe
VmOum2BPCL.exe
memory/1988-151-0x0000000000400000-0x0000000000427000-memory.dmp
memory/1988-132-0x0000000000400000-0x0000000000427000-memory.dmp
memory/1988-134-0x0000000000400000-0x0000000000427000-memory.dmp
memory/1988-156-0x0000000000400000-0x0000000000427000-memory.dmp
memory/4812-143-0x0000000000400000-0x0000000001530000-memory.dmp
memory/4812-142-0x0000000000400000-0x0000000001530000-memory.dmp
memory/4812-147-0x0000000010000000-0x000000001001B000-memory.dmp
memory/4812-152-0x0000000000400000-0x0000000001530000-memory.dmp
memory/4812-155-0x0000000000400000-0x0000000001530000-memory.dmp