Analysis
- max time kernel
60s - max time network
63s - platform
windows7_x64 - resource
win7-20220901-en - resource tags
- submitted
19/12/2022, 00:46
General
- Target file.exe
- Size 2.3MB
- Sample221219-a4msgaea34
- SHA256 5cc4aaa1259957eb27ad62cf1872e3f505ebaa0da76451d2b9e7f40c64454db1
Malware Config
Extracted
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nymaim
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45.139.105.171
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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 9 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
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C:\Users\Admin\AppData\Local\Temp\file.exe"C:\Users\Admin\AppData\Local\Temp\file.exe"1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\is-MFQ38.tmp\is-TLH77.tmp"C:\Users\Admin\AppData\Local\Temp\is-MFQ38.tmp\is-TLH77.tmp" /SL4 $70120 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2109290 1699842⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Program Files (x86)\PrintFolders\ocFolders.exe"C:\Program Files (x86)\PrintFolders\ocFolders.exe"3⤵
- Executes dropped EXE
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\{846ee340-7039-11de-9d20-806e6f6e6963}\JhRFetXdwQ.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "ocFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\ocFolders.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "ocFolders.exe" /f5⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
ocFolders.exe
ocFolders.exe
is-TLH77.tmp
is-TLH77.tmp
JhRFetXdwQ.exe
JhRFetXdwQ.exe
ocFolders.exe
ocFolders.exe
ocFolders.exe
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
is-TLH77.tmp
JhRFetXdwQ.exe
JhRFetXdwQ.exe
JhRFetXdwQ.exe
memory/768-88-0x0000000010000000-0x000000001001B000-memory.dmp
memory/768-76-0x0000000001B10000-0x0000000002C9D000-memory.dmp
memory/768-77-0x0000000000400000-0x000000000158D000-memory.dmp
memory/768-78-0x0000000000400000-0x000000000158D000-memory.dmp
memory/768-74-0x0000000000400000-0x000000000158D000-memory.dmp
memory/768-96-0x0000000000400000-0x000000000158D000-memory.dmp
memory/768-92-0x0000000000400000-0x000000000158D000-memory.dmp
memory/768-75-0x0000000001B10000-0x0000000002C9D000-memory.dmp
memory/768-87-0x0000000000400000-0x000000000158D000-memory.dmp
memory/2012-86-0x0000000003080000-0x000000000420D000-memory.dmp
memory/2012-73-0x0000000003080000-0x000000000420D000-memory.dmp
memory/2028-55-0x0000000000400000-0x0000000000430000-memory.dmp
memory/2028-54-0x00000000759F1000-0x00000000759F3000-memory.dmp
memory/2028-71-0x0000000000400000-0x0000000000430000-memory.dmp
memory/2028-98-0x0000000000400000-0x0000000000430000-memory.dmp