Analysis
- max time kernel
90s - max time network
128s - platform
windows10-2004_x64 - resource
win10v2004-20221111-en - resource tags
- submitted
28/12/2022, 15:01
General
- Target 0d7ef2ca92b5a1befe83c2bd1506e8f7805a695b1a89517f40b6bdae78298af1.exe
- Size 2.1MB
- Sample221228-sdwa2aaf59
- SHA256 0d7ef2ca92b5a1befe83c2bd1506e8f7805a695b1a89517f40b6bdae78298af1
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\0d7ef2ca92b5a1befe83c2bd1506e8f7805a695b1a89517f40b6bdae78298af1.exe"C:\Users\Admin\AppData\Local\Temp\0d7ef2ca92b5a1befe83c2bd1506e8f7805a695b1a89517f40b6bdae78298af1.exe"1⤵
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\Temp\is-5BAI6.tmp\is-T06JI.tmp"C:\Users\Admin\AppData\Local\Temp\is-5BAI6.tmp\is-T06JI.tmp" /SL4 $80056 "C:\Users\Admin\AppData\Local\Temp\0d7ef2ca92b5a1befe83c2bd1506e8f7805a695b1a89517f40b6bdae78298af1.exe" 1865427 1817602⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
-
C:\Program Files (x86)\Split Files\SplitFiles122.exe"C:\Program Files (x86)\Split Files\SplitFiles122.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}\sFJHTxYT.exe4⤵
- Executes dropped EXE
-
-
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles122.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles122.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\taskkill.exetaskkill /im "SplitFiles122.exe" /f5⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
-
-
-
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
SplitFiles122.exe
SplitFiles122.exe
is-T06JI.tmp
is-T06JI.tmp
_iscrypt.dll
sFJHTxYT.exe
sFJHTxYT.exe
memory/728-143-0x0000000000400000-0x000000000155F000-memory.dmp
memory/728-153-0x0000000000400000-0x000000000155F000-memory.dmp
memory/728-142-0x0000000000400000-0x000000000155F000-memory.dmp
memory/728-156-0x0000000000400000-0x000000000155F000-memory.dmp
memory/728-144-0x0000000000400000-0x000000000155F000-memory.dmp
memory/728-148-0x0000000010000000-0x000000001001B000-memory.dmp
memory/752-134-0x0000000000400000-0x0000000000433000-memory.dmp
memory/752-152-0x0000000000400000-0x0000000000433000-memory.dmp
memory/752-132-0x0000000000400000-0x0000000000433000-memory.dmp
memory/752-157-0x0000000000400000-0x0000000000433000-memory.dmp