Analysis
- max time kernel
61s - max time network
64s - platform
windows7_x64 - resource
win7-20220812-en - resource tags
- submitted
24/12/2022, 23:46
General
- Target file.exe
- Size 1.7MB
- Sample221224-3sab8aag97
- SHA256 0154bd600057a64c8d1b44a554fe5f085ec9041bbd76a306babc540c28da8ea3
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-Q17S5.tmp\is-JKIVH.tmp"C:\Users\Admin\AppData\Local\Temp\is-Q17S5.tmp\is-JKIVH.tmp" /SL4 $60126 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1559244 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}\8iwiqxV.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-JKIVH.tmp
is-JKIVH.tmp
8iwiqxV.exe
8iwiqxV.exe
SplitFiles119.exe
SplitFiles119.exe
SplitFiles119.exe
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
is-JKIVH.tmp
8iwiqxV.exe
8iwiqxV.exe
8iwiqxV.exe
memory/688-73-0x0000000003760000-0x0000000004872000-memory.dmp
memory/688-86-0x0000000003760000-0x0000000004872000-memory.dmp
memory/1488-98-0x0000000000400000-0x000000000041E000-memory.dmp
memory/1488-68-0x0000000000400000-0x000000000041E000-memory.dmp
memory/1488-54-0x0000000076DC1000-0x0000000076DC3000-memory.dmp
memory/1488-55-0x0000000000400000-0x000000000041E000-memory.dmp
memory/2028-77-0x0000000000400000-0x0000000001512000-memory.dmp
memory/2028-78-0x0000000000400000-0x0000000001512000-memory.dmp
memory/2028-87-0x0000000000400000-0x0000000001512000-memory.dmp
memory/2028-88-0x0000000010000000-0x000000001001B000-memory.dmp
memory/2028-92-0x0000000000400000-0x0000000001512000-memory.dmp
memory/2028-76-0x0000000001BA0000-0x0000000002CB2000-memory.dmp
memory/2028-75-0x0000000001BA0000-0x0000000002CB2000-memory.dmp
memory/2028-97-0x0000000000400000-0x0000000001512000-memory.dmp
memory/2028-74-0x0000000000400000-0x0000000001512000-memory.dmp