Analysis
- max time kernel
55s - max time network
56s - platform
windows7_x64 - resource
win7-20221111-en - resource tags
- submitted
24/12/2022, 02:02
General
- Target file.exe
- Size 1.9MB
- Sample221224-cf5dqahe23
- SHA256 1fb4d024a81b3f0593e9b9e25964aeca66bec54880faeb7bac0a65211155576f
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-G920C.tmp\is-HKBNR.tmp"C:\Users\Admin\AppData\Local\Temp\is-G920C.tmp\is-HKBNR.tmp" /SL4 $70124 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1766671 1331202⤵
- 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\SplitFiles118.exe"C:\Program Files (x86)\Split Files\SplitFiles118.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}\ICa7yGXaq.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
-
-
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles118.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles118.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\taskkill.exetaskkill /im "SplitFiles118.exe" /f5⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
-
-
-
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
SplitFiles118.exe
SplitFiles118.exe
is-HKBNR.tmp
is-HKBNR.tmp
ICa7yGXaq.exe
ICa7yGXaq.exe
SplitFiles118.exe
SplitFiles118.exe
SplitFiles118.exe
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
is-HKBNR.tmp
ICa7yGXaq.exe
ICa7yGXaq.exe
ICa7yGXaq.exe
memory/688-92-0x0000000001A50000-0x0000000002B99000-memory.dmp
memory/688-91-0x0000000000400000-0x0000000001549000-memory.dmp
memory/688-76-0x0000000001A50000-0x0000000002B99000-memory.dmp
memory/688-77-0x0000000000400000-0x0000000001549000-memory.dmp
memory/688-78-0x0000000000400000-0x0000000001549000-memory.dmp
memory/688-97-0x0000000000400000-0x0000000001549000-memory.dmp
memory/688-74-0x0000000000400000-0x0000000001549000-memory.dmp
memory/688-93-0x0000000001A50000-0x0000000002B99000-memory.dmp
memory/688-75-0x0000000001A50000-0x0000000002B99000-memory.dmp
memory/688-86-0x0000000010000000-0x000000001001B000-memory.dmp
memory/836-90-0x0000000003860000-0x00000000049A9000-memory.dmp
memory/836-73-0x0000000003860000-0x00000000049A9000-memory.dmp
memory/1688-54-0x0000000075C81000-0x0000000075C83000-memory.dmp
memory/1688-55-0x0000000000400000-0x0000000000427000-memory.dmp
memory/1688-69-0x0000000000400000-0x0000000000427000-memory.dmp
memory/1688-99-0x0000000000400000-0x0000000000427000-memory.dmp