Analysis
- max time kernel
153s - max time network
160s - platform
windows10-2004_x64 - resource
win10v2004-20220812-en - resource tags
- submitted
12/12/2022, 08:16
General
- Target file.exe
- Size 2.1MB
- Sample221212-j55jcaah43
- SHA256 0d37a10496a3bbb5cd37565829f65b80247f1f00cf53fa766e123c2632e07753
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 System32 directory 2 IoCs
- 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.
- Checks processor information in registry 2 TTPs 3 IoCs
Processor information is often read in order to detect sandboxing environments.
- Enumerates system info in registry 2 TTPs 2 IoCs
- 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-8FCVN.tmp\is-9IHKB.tmp"C:\Users\Admin\AppData\Local\Temp\is-8FCVN.tmp\is-9IHKB.tmp" /SL4 $F0062 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2000396 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\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\Jl59ClowAvo2.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
-
-
-
-
-
C:\Windows\System32\svchost.exeC:\Windows\System32\svchost.exe -k netsvcs -p1⤵
- Drops file in System32 directory
- Checks processor information in registry
- Enumerates system info in registry
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
nwFolders.exe
nwFolders.exe
is-9IHKB.tmp
is-9IHKB.tmp
_iscrypt.dll
Jl59ClowAvo2.exe
Jl59ClowAvo2.exe
memory/1152-138-0x0000000000400000-0x000000000041E000-memory.dmp
memory/1152-132-0x0000000000400000-0x000000000041E000-memory.dmp
memory/1152-158-0x0000000000400000-0x000000000041E000-memory.dmp
memory/1152-134-0x0000000000400000-0x000000000041E000-memory.dmp
memory/3560-144-0x0000000000400000-0x000000000155F000-memory.dmp
memory/3560-149-0x0000000000400000-0x000000000155F000-memory.dmp
memory/3560-150-0x0000000010000000-0x000000001001B000-memory.dmp
memory/3560-154-0x0000000000400000-0x000000000155F000-memory.dmp
memory/3560-145-0x0000000000400000-0x000000000155F000-memory.dmp
memory/3560-157-0x0000000000400000-0x000000000155F000-memory.dmp
memory/3560-143-0x0000000000400000-0x000000000155F000-memory.dmp