Analysis
- max time kernel
63s - max time network
65s - platform
windows7_x64 - resource
win7-20220812-en - resource tags
- submitted
25/12/2022, 04:16
General
- Target file.exe
- Size 1.7MB
- Sample221225-evs1caec2v
- SHA256 2bd00450772f6dc1200756a7d6a1bfbfaba8ccd6360f35e9c7b80c5fccd6cbde
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 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
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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-1OELJ.tmp\is-R4KP3.tmp"C:\Users\Admin\AppData\Local\Temp\is-1OELJ.tmp\is-R4KP3.tmp" /SL4 $90120 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1568049 962562⤵
- 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)\Split Files\SplitFiles119.exe"C:\Program Files (x86)\Split Files\SplitFiles119.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}\MVgItA2.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles119.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles119.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "SplitFiles119.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
SplitFiles119.exe
SplitFiles119.exe
is-R4KP3.tmp
is-R4KP3.tmp
MVgItA2.exe
MVgItA2.exe
SplitFiles119.exe
SplitFiles119.exe
SplitFiles119.exe
is-R4KP3.tmp
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
MVgItA2.exe
MVgItA2.exe
MVgItA2.exe
memory/560-68-0x0000000000400000-0x000000000041E000-memory.dmp
memory/560-97-0x0000000000400000-0x000000000041E000-memory.dmp
memory/560-54-0x0000000076041000-0x0000000076043000-memory.dmp
memory/560-55-0x0000000000400000-0x000000000041E000-memory.dmp
memory/1232-85-0x00000000039E0000-0x0000000004AF2000-memory.dmp
memory/1232-70-0x00000000039E0000-0x0000000004AF2000-memory.dmp
memory/1380-75-0x0000000001A80000-0x0000000002B92000-memory.dmp
memory/1380-71-0x0000000000400000-0x0000000001512000-memory.dmp
memory/1380-86-0x0000000000400000-0x0000000001512000-memory.dmp
memory/1380-87-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1380-91-0x0000000000400000-0x0000000001512000-memory.dmp
memory/1380-76-0x0000000000400000-0x0000000001512000-memory.dmp
memory/1380-77-0x0000000000400000-0x0000000001512000-memory.dmp
memory/1380-96-0x0000000000400000-0x0000000001512000-memory.dmp