Analysis
- max time kernel
71s - max time network
73s - platform
windows7_x64 - resource
win7-20220812-en - resource tags
- submitted
17/10/2022, 12:19
General
- Target file.exe
- Size 2.4MB
- Sample221017-pg6pdsbgd2
- SHA256 8613ddffa1f57cf74edac3190da1b679e564ed36db817207763ae8fff7e89835
Malware Config
Extracted
-
nymaim
-
45.15.156.54
-
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 6 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 3 IoCs
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of WriteProcessMemory 23 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-TT4BE.tmp\is-UUNPR.tmp"C:\Users\Admin\AppData\Local\Temp\is-TT4BE.tmp\is-UUNPR.tmp" /SL4 $6012A "C:\Users\Admin\AppData\Local\Temp\file.exe" 2247814 527362⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
-
C:\Program Files (x86)\efSearcher\efsearcher51.exe"C:\Program Files (x86)\efSearcher\efsearcher51.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}\s1sfwN2qIYB4r.exe4⤵
- Executes dropped EXE
-
-
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "efsearcher51.exe" /f & erase "C:\Program Files (x86)\efSearcher\efsearcher51.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\taskkill.exetaskkill /im "efsearcher51.exe" /f5⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
-
-
-
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
efsearcher51.exe
efsearcher51.exe
is-UUNPR.tmp
is-UUNPR.tmp
s1sfwN2qIYB4r.exe
efsearcher51.exe
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
is-UUNPR.tmp
s1sfwN2qIYB4r.exe
memory/900-54-0x0000000075C61000-0x0000000075C63000-memory.dmp
memory/900-55-0x0000000000400000-0x0000000000414000-memory.dmp
memory/900-87-0x0000000000400000-0x0000000000414000-memory.dmp
memory/900-65-0x0000000000400000-0x0000000000414000-memory.dmp
memory/1388-71-0x0000000000400000-0x00000000015F8000-memory.dmp
memory/1388-75-0x0000000000400000-0x00000000015F8000-memory.dmp
memory/1388-73-0x0000000000400000-0x00000000015F8000-memory.dmp
memory/1388-72-0x0000000000400000-0x00000000015F8000-memory.dmp
memory/1388-79-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1388-83-0x0000000000400000-0x00000000015F8000-memory.dmp
memory/1388-86-0x0000000000400000-0x00000000015F8000-memory.dmp
memory/2004-74-0x0000000003220000-0x0000000004418000-memory.dmp
memory/2004-70-0x0000000003220000-0x0000000004418000-memory.dmp