Analysis
- max time kernel
77s - max time network
88s - platform
windows7_x64 - resource
win7-20221111-en - resource tags
- submitted
12/12/2022, 02:32
General
- Target file.exe
- Size 2.3MB
- Sample221212-c1bbdach2t
- SHA256 eeb73a7ee8807b63c2a9e11b578dc3e79c8e7a3afed91b3c242c84587d52596f
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-L3G2R.tmp\is-6I5TC.tmp"C:\Users\Admin\AppData\Local\Temp\is-L3G2R.tmp\is-6I5TC.tmp" /SL4 $90124 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2156088 1715202⤵
- 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\nvFolders.exe"C:\Program Files (x86)\PrintFolders\nvFolders.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}\XnUPRwS7F8TwWr.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "nvFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\nvFolders.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "nvFolders.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
nvFolders.exe
nvFolders.exe
is-6I5TC.tmp
is-6I5TC.tmp
XnUPRwS7F8TwWr.exe
XnUPRwS7F8TwWr.exe
nvFolders.exe
nvFolders.exe
nvFolders.exe
is-6I5TC.tmp
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
XnUPRwS7F8TwWr.exe
XnUPRwS7F8TwWr.exe
XnUPRwS7F8TwWr.exe
memory/268-88-0x0000000010000000-0x000000001001B000-memory.dmp
memory/268-87-0x0000000000400000-0x0000000001571000-memory.dmp
memory/268-75-0x0000000001C10000-0x0000000002D81000-memory.dmp
memory/268-93-0x0000000000400000-0x0000000001571000-memory.dmp
memory/268-77-0x0000000000400000-0x0000000001571000-memory.dmp
memory/268-78-0x0000000000400000-0x0000000001571000-memory.dmp
memory/268-76-0x0000000001C10000-0x0000000002D81000-memory.dmp
memory/268-74-0x0000000000400000-0x0000000001571000-memory.dmp
memory/1728-54-0x0000000075881000-0x0000000075883000-memory.dmp
memory/1728-62-0x0000000000400000-0x0000000000430000-memory.dmp
memory/1728-55-0x0000000000400000-0x0000000000430000-memory.dmp
memory/1728-94-0x0000000000400000-0x0000000000430000-memory.dmp
memory/2024-73-0x0000000003190000-0x0000000004301000-memory.dmp
memory/2024-86-0x0000000003190000-0x0000000004301000-memory.dmp