Analysis
- max time kernel
65s - max time network
68s - platform
windows7_x64 - resource
win7-20220812-en - resource tags
- submitted
01/01/2023, 11:29
General
- Target file.exe
- Size 2.1MB
- Sample230101-nllpcabe82
- SHA256 1a49e3fd9cea77ca6e625214e9d0f0e66b41fc26fac316336fc969fc8cf511a5
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-RQBVR.tmp\is-IA66M.tmp"C:\Users\Admin\AppData\Local\Temp\is-RQBVR.tmp\is-IA66M.tmp" /SL4 $6012A "C:\Users\Admin\AppData\Local\Temp\file.exe" 1915691 2094082⤵
- 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\SplitFiles127.exe"C:\Program Files (x86)\Split Files\SplitFiles127.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}\LmiX5.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles127.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles127.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "SplitFiles127.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
SplitFiles127.exe
SplitFiles127.exe
is-IA66M.tmp
is-IA66M.tmp
LmiX5.exe
LmiX5.exe
SplitFiles127.exe
SplitFiles127.exe
SplitFiles127.exe
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
is-IA66M.tmp
LmiX5.exe
LmiX5.exe
LmiX5.exe
memory/1360-65-0x0000000000400000-0x0000000000439000-memory.dmp
memory/1360-54-0x00000000756A1000-0x00000000756A3000-memory.dmp
memory/1360-98-0x0000000000400000-0x0000000000439000-memory.dmp
memory/1360-55-0x0000000000400000-0x0000000000439000-memory.dmp
memory/1704-88-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1704-92-0x0000000000400000-0x0000000001581000-memory.dmp
memory/1704-76-0x0000000001C10000-0x0000000002D91000-memory.dmp
memory/1704-78-0x0000000000400000-0x0000000001581000-memory.dmp
memory/1704-97-0x0000000000400000-0x0000000001581000-memory.dmp
memory/1704-77-0x0000000000400000-0x0000000001581000-memory.dmp
memory/1704-74-0x0000000000400000-0x0000000001581000-memory.dmp
memory/1704-87-0x0000000000400000-0x0000000001581000-memory.dmp
memory/1704-75-0x0000000001C10000-0x0000000002D91000-memory.dmp
memory/2008-86-0x0000000003970000-0x0000000004AF1000-memory.dmp
memory/2008-73-0x0000000003970000-0x0000000004AF1000-memory.dmp