Analysis
- max time kernel
98s - max time network
118s - platform
windows10-2004_x64 - resource
win10v2004-20221111-en - resource tags
- submitted
16/11/2022, 14:03
General
- Target file.exe
- Size 2.1MB
- Sample221116-rcscbaff4w
- SHA256 611962aad7d4768bfdb35bfe8ec75585d9e7f4c3fed22b42f686e6a4e8f31214
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 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-43G5C.tmp\is-GK470.tmp"C:\Users\Admin\AppData\Local\Temp\is-43G5C.tmp\is-GK470.tmp" /SL4 $A011C "C:\Users\Admin\AppData\Local\Temp\file.exe" 1947997 547842⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
-
C:\Program Files (x86)\gnSearcher\gnsearcher81.exe"C:\Program Files (x86)\gnSearcher\gnsearcher81.exe"3⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\RxDBp2iA.exe4⤵
- Executes dropped EXE
-
-
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "gnsearcher81.exe" /f & erase "C:\Program Files (x86)\gnSearcher\gnsearcher81.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\taskkill.exetaskkill /im "gnsearcher81.exe" /f5⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
-
-
-
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
gnsearcher81.exe
gnsearcher81.exe
is-GK470.tmp
is-GK470.tmp
_iscrypt.dll
RxDBp2iA.exe
RxDBp2iA.exe
memory/2100-148-0x0000000010000000-0x000000001001B000-memory.dmp
memory/2100-144-0x0000000000400000-0x00000000014D6000-memory.dmp
memory/2100-142-0x0000000000400000-0x00000000014D6000-memory.dmp
memory/2100-143-0x0000000000400000-0x00000000014D6000-memory.dmp
memory/2100-152-0x0000000000400000-0x00000000014D6000-memory.dmp
memory/2100-155-0x0000000000400000-0x00000000014D6000-memory.dmp
memory/3640-132-0x0000000000400000-0x0000000000414000-memory.dmp
memory/3640-138-0x0000000000400000-0x0000000000414000-memory.dmp
memory/3640-156-0x0000000000400000-0x0000000000414000-memory.dmp