Analysis
- max time kernel
188s - max time network
193s - platform
windows10-2004_x64 - resource
win10v2004-20220812-en - resource tags
- submitted
11/12/2022, 21:16
General
- Target file.exe
- Size 2.5MB
- Sample221211-z4f3cshe63
- SHA256 ec6ad76adb810da04fda189dbb52f55da549c8ac5bcd98c3c59ffdcc6e3932dd
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 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 9 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Suspicious behavior: EnumeratesProcesses 6 IoCs
- Suspicious behavior: GetForegroundWindowSpam 1 IoCs
- Suspicious use of WriteProcessMemory 9 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\file.exe"C:\Users\Admin\AppData\Local\Temp\file.exe"1⤵
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\is-A5CV3.tmp\is-G4JBD.tmp"C:\Users\Admin\AppData\Local\Temp\is-A5CV3.tmp\is-G4JBD.tmp" /SL4 $80064 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2323658 1715202⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
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C:\Program Files (x86)\PrintFolders\nvFolders.exe"C:\Program Files (x86)\PrintFolders\nvFolders.exe"3⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\vnKfphvK6fenYi.exe4⤵
- Executes dropped EXE
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
nvFolders.exe
nvFolders.exe
is-G4JBD.tmp
is-G4JBD.tmp
_iscrypt.dll
vnKfphvK6fenYi.exe
vnKfphvK6fenYi.exe
memory/2040-132-0x0000000000400000-0x0000000000430000-memory.dmp
memory/2040-134-0x0000000000400000-0x0000000000430000-memory.dmp
memory/4928-142-0x0000000000400000-0x00000000015A3000-memory.dmp
memory/4928-143-0x0000000000400000-0x00000000015A3000-memory.dmp
memory/4928-147-0x0000000000400000-0x00000000015A3000-memory.dmp
memory/4928-148-0x0000000010000000-0x000000001001B000-memory.dmp