Analysis
- max time kernel
65s - max time network
67s - platform
windows7_x64 - resource
win7-20220812-en - resource tags
- submitted
06/01/2023, 00:18
General
- Target file.exe
- Size 1.9MB
- Sample230106-allsfsdg39
- SHA256 a6c50af3e7a6a877e939de6dc89af72c6b2cfd2db4b3a303c4b0bf8b6a64df4c
Malware Config
Extracted
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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-33T21.tmp\is-Q3OST.tmp"C:\Users\Admin\AppData\Local\Temp\is-33T21.tmp\is-Q3OST.tmp" /SL4 $60122 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1673510 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}\PufuoXl7uhhs.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-Q3OST.tmp
is-Q3OST.tmp
PufuoXl7uhhs.exe
PufuoXl7uhhs.exe
SplitFiles131.exe
SplitFiles131.exe
SplitFiles131.exe
is-Q3OST.tmp
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
PufuoXl7uhhs.exe
PufuoXl7uhhs.exe
PufuoXl7uhhs.exe
memory/1128-86-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1128-76-0x0000000000400000-0x0000000001526000-memory.dmp
memory/1128-77-0x0000000000400000-0x0000000001526000-memory.dmp
memory/1128-94-0x0000000000400000-0x0000000001526000-memory.dmp
memory/1128-85-0x0000000000400000-0x0000000001526000-memory.dmp
memory/1128-74-0x0000000000400000-0x0000000001526000-memory.dmp
memory/1128-90-0x0000000000400000-0x0000000001526000-memory.dmp
memory/1128-75-0x0000000001BD0000-0x0000000002CF6000-memory.dmp
memory/1720-65-0x0000000000400000-0x0000000000430000-memory.dmp
memory/1720-55-0x0000000000400000-0x0000000000430000-memory.dmp
memory/1720-54-0x0000000074BB1000-0x0000000074BB3000-memory.dmp
memory/1720-96-0x0000000000400000-0x0000000000430000-memory.dmp
memory/1948-73-0x0000000003980000-0x0000000004AA6000-memory.dmp