Analysis
- max time kernel
63s - max time network
66s - platform
windows7_x64 - resource
win7-20220812-en - resource tags
- submitted
01/01/2023, 03:53
General
- Target file.exe
- Size 1.9MB
- Sample230101-efn3vabb63
- SHA256 010f243b1a0d899eada41c5d5dc7b5d92378872cd9b961e6b6f7cfeda605fc8a
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
- Loads dropped DLL 10 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 3 IoCs
- Suspicious use of AdjustPrivilegeToken 3 IoCs
- Suspicious use of WriteProcessMemory 35 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\file.exe"C:\Users\Admin\AppData\Local\Temp\file.exe"1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\Temp\is-5KGKU.tmp\is-PMFAU.tmp"C:\Users\Admin\AppData\Local\Temp\is-5KGKU.tmp\is-PMFAU.tmp" /SL4 $60122 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1727109 2094082⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Program Files (x86)\Split Files\SplitFiles126.exe"C:\Program Files (x86)\Split Files\SplitFiles126.exe"3⤵
- Executes dropped EXE
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Roaming\{846ee340-7039-11de-9d20-806e6f6e6963}\WlgCFJIITnEe.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
-
-
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles126.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles126.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\taskkill.exetaskkill /im "SplitFiles126.exe" /f5⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
-
-
-
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
SplitFiles126.exe
SplitFiles126.exe
is-PMFAU.tmp
is-PMFAU.tmp
WlgCFJIITnEe.exe
WlgCFJIITnEe.exe
SplitFiles126.exe
SplitFiles126.exe
SplitFiles126.exe
is-PMFAU.tmp
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
WlgCFJIITnEe.exe
WlgCFJIITnEe.exe
WlgCFJIITnEe.exe
memory/1504-87-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1504-86-0x0000000000400000-0x000000000154F000-memory.dmp
memory/1504-76-0x0000000001AD0000-0x0000000002C1F000-memory.dmp
memory/1504-77-0x0000000000400000-0x000000000154F000-memory.dmp
memory/1504-78-0x0000000000400000-0x000000000154F000-memory.dmp
memory/1504-96-0x0000000000400000-0x000000000154F000-memory.dmp
memory/1504-91-0x0000000000400000-0x000000000154F000-memory.dmp
memory/1504-75-0x0000000001AD0000-0x0000000002C1F000-memory.dmp
memory/1504-74-0x0000000000400000-0x000000000154F000-memory.dmp
memory/1672-55-0x0000000000400000-0x0000000000439000-memory.dmp
memory/1672-65-0x0000000000400000-0x0000000000439000-memory.dmp
memory/1672-54-0x0000000075841000-0x0000000075843000-memory.dmp
memory/1672-97-0x0000000000400000-0x0000000000439000-memory.dmp
memory/1896-73-0x0000000003A80000-0x0000000004BCF000-memory.dmp