Analysis
- max time kernel
61s - max time network
65s - platform
windows7_x64 - resource
win7-20220901-en - resource tags
- submitted
03/12/2022, 16:17
General
- Target file.exe
- Size 3.6MB
- Sample221203-trclhsfb23
- SHA256 b3f3628cfaa89d530a01bc1ad64dbf692bd859101e747df3fde412e64b2e46b6
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-5SU1B.tmp\is-4UH3B.tmp"C:\Users\Admin\AppData\Local\Temp\is-5SU1B.tmp\is-4UH3B.tmp" /SL4 $80022 "C:\Users\Admin\AppData\Local\Temp\file.exe" 3524232 517122⤵
- 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\PrintFolders.exe"C:\Program Files (x86)\PrintFolders\PrintFolders.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}\Mmtvk5oitOp8gP.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "PrintFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\PrintFolders.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "PrintFolders.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
PrintFolders.exe
PrintFolders.exe
is-4UH3B.tmp
is-4UH3B.tmp
Mmtvk5oitOp8gP.exe
Mmtvk5oitOp8gP.exe
PrintFolders.exe
PrintFolders.exe
PrintFolders.exe
is-4UH3B.tmp
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
Mmtvk5oitOp8gP.exe
Mmtvk5oitOp8gP.exe
Mmtvk5oitOp8gP.exe
memory/940-86-0x0000000003020000-0x000000000440C000-memory.dmp
memory/940-73-0x0000000003020000-0x000000000440C000-memory.dmp
memory/1284-75-0x0000000001D70000-0x000000000315C000-memory.dmp
memory/1284-92-0x0000000000400000-0x00000000017EC000-memory.dmp
memory/1284-77-0x0000000000400000-0x00000000017EC000-memory.dmp
memory/1284-76-0x0000000001D70000-0x000000000315C000-memory.dmp
memory/1284-78-0x0000000000400000-0x00000000017EC000-memory.dmp
memory/1284-74-0x0000000000400000-0x00000000017EC000-memory.dmp
memory/1284-97-0x0000000000400000-0x00000000017EC000-memory.dmp
memory/1284-87-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1284-91-0x0000000000400000-0x00000000017EC000-memory.dmp
memory/1368-54-0x0000000076461000-0x0000000076463000-memory.dmp
memory/1368-55-0x0000000000400000-0x0000000000413000-memory.dmp
memory/1368-65-0x0000000000400000-0x0000000000413000-memory.dmp
memory/1368-98-0x0000000000400000-0x0000000000413000-memory.dmp