Analysis
- max time kernel
56s - max time network
57s - platform
windows7_x64 - resource
win7-20221111-en - resource tags
- submitted
20/12/2022, 16:17
General
- Target file.exe
- Size 1.6MB
- Sample221220-trclhsdd5t
- SHA256 0d7abf44b5f524e031d19ede70cd8cb3cd15e65621c42f5667300a8a5a3d7b87
Malware Config
Extracted
-
nymaim
-
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-I0VFE.tmp\is-TLA4J.tmp"C:\Users\Admin\AppData\Local\Temp\is-I0VFE.tmp\is-TLA4J.tmp" /SL4 $70122 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1489502 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)\Split Files\SplitFiles.exe"C:\Program Files (x86)\Split Files\SplitFiles.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}\XAXP7dJfoN7e5P.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "SplitFiles.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
SplitFiles.exe
SplitFiles.exe
is-TLA4J.tmp
is-TLA4J.tmp
XAXP7dJfoN7e5P.exe
XAXP7dJfoN7e5P.exe
SplitFiles.exe
SplitFiles.exe
SplitFiles.exe
is-TLA4J.tmp
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
XAXP7dJfoN7e5P.exe
XAXP7dJfoN7e5P.exe
XAXP7dJfoN7e5P.exe
memory/1132-86-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1132-92-0x0000000000400000-0x000000000150C000-memory.dmp
memory/1132-77-0x0000000000400000-0x000000000150C000-memory.dmp
memory/1132-78-0x0000000000400000-0x000000000150C000-memory.dmp
memory/1132-75-0x0000000001BB0000-0x0000000002CBC000-memory.dmp
memory/1132-74-0x0000000000400000-0x000000000150C000-memory.dmp
memory/1132-96-0x0000000000400000-0x000000000150C000-memory.dmp
memory/1132-76-0x0000000001BB0000-0x0000000002CBC000-memory.dmp
memory/1132-91-0x0000000000400000-0x000000000150C000-memory.dmp
memory/1720-55-0x0000000000400000-0x0000000000413000-memory.dmp
memory/1720-71-0x0000000000400000-0x0000000000413000-memory.dmp
memory/1720-54-0x0000000075FF1000-0x0000000075FF3000-memory.dmp
memory/1720-98-0x0000000000400000-0x0000000000413000-memory.dmp
memory/2032-90-0x00000000038E0000-0x00000000049EC000-memory.dmp
memory/2032-73-0x00000000038E0000-0x00000000049EC000-memory.dmp