Analysis
- max time kernel
61s - max time network
63s - platform
windows7_x64 - resource
win7-20220812-en - resource tags
- submitted
06/01/2023, 02:32
General
- Target file.exe
- Size 1.9MB
- Sample230106-c1apvaea68
- SHA256 c81f81937e159270e5bc23b1e2493be6c7ebaa76edf14dc611d942c8abdc1e15
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-5DCBR.tmp\is-0ARV3.tmp"C:\Users\Admin\AppData\Local\Temp\is-5DCBR.tmp\is-0ARV3.tmp" /SL4 $60122 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1666431 1704962⤵
- 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\SplitFiles131.exe"C:\Program Files (x86)\Split Files\SplitFiles131.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}\cEk7dc.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles131.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles131.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "SplitFiles131.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
SplitFiles131.exe
SplitFiles131.exe
is-0ARV3.tmp
is-0ARV3.tmp
cEk7dc.exe
cEk7dc.exe
SplitFiles131.exe
SplitFiles131.exe
SplitFiles131.exe
is-0ARV3.tmp
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
cEk7dc.exe
cEk7dc.exe
cEk7dc.exe
memory/1004-73-0x0000000003980000-0x0000000004AA6000-memory.dmp
memory/1792-97-0x0000000000400000-0x0000000000430000-memory.dmp
memory/1792-72-0x0000000000400000-0x0000000000430000-memory.dmp
memory/1792-55-0x0000000000400000-0x0000000000430000-memory.dmp
memory/1792-54-0x0000000076321000-0x0000000076323000-memory.dmp
memory/1992-74-0x0000000000400000-0x0000000001526000-memory.dmp
memory/1992-78-0x0000000000400000-0x0000000001526000-memory.dmp
memory/1992-77-0x0000000000400000-0x0000000001526000-memory.dmp
memory/1992-86-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1992-90-0x0000000000400000-0x0000000001526000-memory.dmp
memory/1992-91-0x0000000001C10000-0x0000000002D36000-memory.dmp
memory/1992-76-0x0000000001C10000-0x0000000002D36000-memory.dmp
memory/1992-75-0x0000000001C10000-0x0000000002D36000-memory.dmp
memory/1992-96-0x0000000000400000-0x0000000001526000-memory.dmp