Analysis
- max time kernel
142s - max time network
126s - platform
windows10-2004_x64 - resource
win10v2004-20221111-en - resource tags
- submitted
12/12/2022, 13:46
General
- Target file.exe
- Size 2.2MB
- Sample221212-q2ypysbd99
- SHA256 c64c703e0459e64505dde6c233982869011cfbbd2cd6506fcb4c39bf83922bff
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 9 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-EI5T3.tmp\is-57QBF.tmp"C:\Users\Admin\AppData\Local\Temp\is-EI5T3.tmp\is-57QBF.tmp" /SL4 $D0064 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2040894 962562⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
-
C:\Program Files (x86)\PrintFolders\nwFolders.exe"C:\Program Files (x86)\PrintFolders\nwFolders.exe"3⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Roaming\{6e1ce040-6208-11ed-b5ce-806e6f6e6963}\5PBbMZ6.exe4⤵
- Executes dropped EXE
-
-
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "nwFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\nwFolders.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\taskkill.exetaskkill /im "nwFolders.exe" /f5⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
-
-
-
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
nwFolders.exe
nwFolders.exe
_iscrypt.dll
is-57QBF.tmp
is-57QBF.tmp
5PBbMZ6.exe
5PBbMZ6.exe
memory/3140-142-0x0000000000400000-0x000000000155F000-memory.dmp
memory/3140-144-0x0000000000400000-0x000000000155F000-memory.dmp
memory/3140-143-0x0000000000400000-0x000000000155F000-memory.dmp
memory/3140-148-0x0000000010000000-0x000000001001B000-memory.dmp
memory/3140-153-0x0000000000400000-0x000000000155F000-memory.dmp
memory/3140-156-0x0000000000400000-0x000000000155F000-memory.dmp
memory/4228-132-0x0000000000400000-0x000000000041E000-memory.dmp
memory/4228-152-0x0000000000400000-0x000000000041E000-memory.dmp
memory/4228-134-0x0000000000400000-0x000000000041E000-memory.dmp
memory/4228-157-0x0000000000400000-0x000000000041E000-memory.dmp