Analysis
- max time kernel
57s - max time network
59s - platform
windows7_x64 - resource
win7-20221111-en - resource tags
- submitted
04/01/2023, 06:52
General
- Target file.exe
- Size 2.0MB
- Sample230104-hm3flahe4x
- SHA256 963bbccc9273c59bac7176591f3f761c433f9f41692528a0f77b38aee0175a94
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-AOTNB.tmp\is-CCAFN.tmp"C:\Users\Admin\AppData\Local\Temp\is-AOTNB.tmp\is-CCAFN.tmp" /SL4 $70122 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1826817 3174402⤵
- 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\SplitFiles130.exe"C:\Program Files (x86)\Split Files\SplitFiles130.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}\3ecwYkn118.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles130.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles130.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "SplitFiles130.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
SplitFiles130.exe
SplitFiles130.exe
is-CCAFN.tmp
is-CCAFN.tmp
3ecwYkn118.exe
3ecwYkn118.exe
SplitFiles130.exe
SplitFiles130.exe
SplitFiles130.exe
is-CCAFN.tmp
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
3ecwYkn118.exe
3ecwYkn118.exe
3ecwYkn118.exe
memory/668-88-0x00000000019E0000-0x0000000002B2A000-memory.dmp
memory/668-75-0x00000000019E0000-0x0000000002B2A000-memory.dmp
memory/668-76-0x00000000019E0000-0x0000000002B2A000-memory.dmp
memory/668-77-0x0000000000400000-0x000000000154A000-memory.dmp
memory/668-78-0x0000000000400000-0x000000000154A000-memory.dmp
memory/668-99-0x0000000000400000-0x000000000154A000-memory.dmp
memory/668-94-0x0000000000400000-0x000000000154A000-memory.dmp
memory/668-93-0x00000000019E0000-0x0000000002B2A000-memory.dmp
memory/668-89-0x0000000010000000-0x000000001001B000-memory.dmp
memory/668-74-0x0000000000400000-0x000000000154A000-memory.dmp
memory/668-86-0x0000000000400000-0x000000000154A000-memory.dmp
memory/1204-55-0x0000000000400000-0x0000000000454000-memory.dmp
memory/1204-54-0x00000000753F1000-0x00000000753F3000-memory.dmp
memory/1204-68-0x0000000000400000-0x0000000000454000-memory.dmp
memory/1204-100-0x0000000000400000-0x0000000000454000-memory.dmp
memory/2036-87-0x00000000038A0000-0x00000000049EA000-memory.dmp
memory/2036-70-0x00000000038A0000-0x00000000049EA000-memory.dmp