Analysis
- max time kernel
58s - max time network
61s - platform
windows7_x64 - resource
win7-20221111-en - resource tags
- submitted
01/01/2023, 02:37
General
- Target file.exe
- Size 1.9MB
- Sample230101-c35yrsbb28
- SHA256 6df55ea7458443d0e96a5c8b7f28bfa758e26bbf5f7af5286162c303a271a708
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-4O29L.tmp\is-M5UE9.tmp"C:\Users\Admin\AppData\Local\Temp\is-4O29L.tmp\is-M5UE9.tmp" /SL4 $90124 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1708286 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\SplitFiles126.exe"C:\Program Files (x86)\Split Files\SplitFiles126.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}\qrvAFxm3uI5CX.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles126.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles126.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "SplitFiles126.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
SplitFiles126.exe
SplitFiles126.exe
is-M5UE9.tmp
is-M5UE9.tmp
qrvAFxm3uI5CX.exe
qrvAFxm3uI5CX.exe
SplitFiles126.exe
SplitFiles126.exe
SplitFiles126.exe
is-M5UE9.tmp
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
qrvAFxm3uI5CX.exe
qrvAFxm3uI5CX.exe
qrvAFxm3uI5CX.exe
memory/588-87-0x0000000010000000-0x000000001001B000-memory.dmp
memory/588-86-0x0000000000400000-0x000000000154F000-memory.dmp
memory/588-75-0x0000000001BC0000-0x0000000002D0F000-memory.dmp
memory/588-76-0x0000000000400000-0x000000000154F000-memory.dmp
memory/588-77-0x0000000000400000-0x000000000154F000-memory.dmp
memory/588-74-0x0000000000400000-0x000000000154F000-memory.dmp
memory/588-96-0x0000000000400000-0x000000000154F000-memory.dmp
memory/588-91-0x0000000000400000-0x000000000154F000-memory.dmp
memory/1728-54-0x0000000075881000-0x0000000075883000-memory.dmp
memory/1728-67-0x0000000000400000-0x0000000000439000-memory.dmp
memory/1728-55-0x0000000000400000-0x0000000000439000-memory.dmp
memory/1728-97-0x0000000000400000-0x0000000000439000-memory.dmp
memory/2024-85-0x0000000003860000-0x00000000049AF000-memory.dmp
memory/2024-70-0x0000000003860000-0x00000000049AF000-memory.dmp