Analysis
- max time kernel
150s - max time network
153s - platform
windows10-2004_x64 - resource
win10v2004-20220812-en - resource tags
- submitted
19/10/2022, 08:54
General
- Target file.exe
- Size 2.4MB
- Sample221019-ktv17sfffr
- SHA256 1ff2edf683c2677df9f4074b5090458cd32ffba1fdd0e6056f15e5427f5e95ae
Malware Config
Extracted
-
nymaim
-
45.15.156.54
-
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
-
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-4H90S.tmp\is-AIO3C.tmp"C:\Users\Admin\AppData\Local\Temp\is-4H90S.tmp\is-AIO3C.tmp" /SL4 $801D8 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2282624 527362⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
-
C:\Program Files (x86)\ejSearcher\ejsearcher53.exe"C:\Program Files (x86)\ejSearcher\ejsearcher53.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}\JXQq2X6t.exe4⤵
- Executes dropped EXE
-
-
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "ejsearcher53.exe" /f & erase "C:\Program Files (x86)\ejSearcher\ejsearcher53.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\taskkill.exetaskkill /im "ejsearcher53.exe" /f5⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
-
-
-
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
ejsearcher53.exe
ejsearcher53.exe
_iscrypt.dll
is-AIO3C.tmp
is-AIO3C.tmp
JXQq2X6t.exe
JXQq2X6t.exe
memory/2248-143-0x0000000000400000-0x00000000015F6000-memory.dmp
memory/2248-142-0x0000000000400000-0x00000000015F6000-memory.dmp
memory/2248-147-0x0000000010000000-0x000000001001B000-memory.dmp
memory/2248-151-0x0000000000400000-0x00000000015F6000-memory.dmp
memory/2248-154-0x0000000000400000-0x00000000015F6000-memory.dmp
memory/4580-132-0x0000000000400000-0x0000000000414000-memory.dmp
memory/4580-137-0x0000000000400000-0x0000000000414000-memory.dmp
memory/4580-155-0x0000000000400000-0x0000000000414000-memory.dmp