Analysis
- max time kernel
150s - max time network
151s - platform
windows10-2004_x64 - resource
win10v2004-20260513-en - resource tags
- submitted
01/09/2026, 04:27
General
- Target 税務調査.exe
- Size 34KB
- Sample260901-e3b2sswtbz
- SHA256 b84ff202378442d620ee9908b24427ed07779c06bcd08b7ad1b8cb1e893619e2
Malware Config
Extracted
-
valleyrat_s2
-
1.0
-
204.194.50.231:449
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204.194.50.231:443
Signatures
- Family: ValleyRat
ValleyRat stage2 is a backdoor written in C++.
- Detects ValleyRAT payload 6 IoCs
- Adds Run key to start application 2 TTPs 1 IoCs
- Enumerates connected drives 3 TTPs 44 IoCs
Attempts to read the root path of hard drives other than the default C: drive.
- Looks up external IP address via web service 1 TTPs 2 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- UPX packed file 11 IoCs
Detects executables packed with UPX/modified UPX open source packer.
- Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- Executes dropped EXE 5 IoCs
- Loads dropped DLL 18 IoCs
- Executes a command shell one-liner 1 TTPs 2 IoCs
Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.
- Modifies registry class 7 IoCs
- Suspicious behavior: EnumeratesProcesses 8 IoCs
- Suspicious behavior: LoadsDriver 1 IoCs
- Suspicious use of WriteProcessMemory 6 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\税務調査.exe"C:\Users\Admin\AppData\Local\Temp\税務調査.exe"1⤵
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Windows\explorer.exeexplorer.exe shell:::{4C7A411E-8AFD-49C4-96B0-6C1139A79EDA}2⤵
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C:\Users\Admin\AppData\Local\Temp\~tmp_77395.tmpC:\Users\Admin\AppData\Local\Temp\~tmp_77395.tmp1⤵
- Executes dropped EXE
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C:\Windows\explorer.exeC:\Windows\explorer.exe /factory,{75dff2b7-6936-4c06-a8bb-676a7b00b24b} -Embedding1⤵
- Modifies registry class
- Suspicious use of WriteProcessMemory
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C:\ProgramData\OpenraVPN\Loader.exe"C:\ProgramData\OpenraVPN\Loader.exe" -onlyctrl2⤵
- Executes dropped EXE
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\cmd.execmd.exe /c "C:\ProgramData\OpenraVPN\Loader.exe -reonlyctrl"3⤵
- Executes a command shell one-liner
- Suspicious use of WriteProcessMemory
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C:\ProgramData\OpenraVPN\Loader.exeC:\ProgramData\OpenraVPN\Loader.exe -reonlyctrl4⤵
- Adds Run key to start application
- Enumerates connected drives
- Executes dropped EXE
- Loads dropped DLL
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C:\ProgramData\OpenraVPN\Loader.exe"C:\ProgramData\OpenraVPN\Loader.exe" -onlyctrl1⤵
- Executes dropped EXE
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
-
C:\Windows\system32\cmd.execmd.exe /c "C:\ProgramData\OpenraVPN\Loader.exe -reonlyctrl"2⤵
- Executes a command shell one-liner
- Suspicious use of WriteProcessMemory
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C:\ProgramData\OpenraVPN\Loader.exeC:\ProgramData\OpenraVPN\Loader.exe -reonlyctrl3⤵
- Enumerates connected drives
- Executes dropped EXE
- Loads dropped DLL
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Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
Loader.exe
MSVCP140.dll
VCRUNTIME140.dll
heif.dll
vcruntime140_1.dll
~tmp_77395.tmp
memory/2176-51-0x0000000140000000-0x000000014002A000-memory.dmp
memory/2176-52-0x0000000140000000-0x000000014002A000-memory.dmp
memory/2176-55-0x000001CAF9C60000-0x000001CAF9CB0000-memory.dmp
memory/2176-56-0x000001CAF9C60000-0x000001CAF9CB0000-memory.dmp
memory/2176-53-0x0000000140000000-0x000000014002A000-memory.dmp
memory/2176-34-0x0000000140000000-0x000000014002A000-memory.dmp
memory/2176-54-0x000001CAF9C60000-0x000001CAF9CB0000-memory.dmp
memory/2176-67-0x00007FFB1F250000-0x00007FFB1F54C000-memory.dmp
memory/2176-64-0x0000000140000000-0x000000014002A000-memory.dmp
memory/2176-63-0x0000000140000000-0x000000014002A000-memory.dmp
memory/3952-0-0x00007FFB1FA40000-0x00007FFB1FD3C000-memory.dmp
memory/3952-23-0x00007FFB1FA40000-0x00007FFB1FD3C000-memory.dmp
memory/3952-1-0x00007FFB1FA40000-0x00007FFB1FD3C000-memory.dmp
memory/5344-22-0x00007FFB1F250000-0x00007FFB1F54C000-memory.dmp
memory/5344-35-0x00007FFB1F250000-0x00007FFB1F54C000-memory.dmp
memory/5344-24-0x00007FFB1F250000-0x00007FFB1F54C000-memory.dmp
memory/5436-60-0x000001C955DA0000-0x000001C955DF0000-memory.dmp
memory/5436-58-0x0000000140000000-0x000000014002A000-memory.dmp
memory/5436-59-0x0000000140000000-0x000000014002A000-memory.dmp
memory/5436-57-0x0000000140000000-0x000000014002A000-memory.dmp
memory/5436-62-0x000001C955DA0000-0x000001C955DF0000-memory.dmp
memory/5436-61-0x000001C955DA0000-0x000001C955DF0000-memory.dmp
memory/5436-49-0x0000000140000000-0x000000014002A000-memory.dmp
memory/5436-65-0x0000000140000000-0x000000014002A000-memory.dmp
memory/5436-66-0x0000000140000000-0x000000014002A000-memory.dmp
memory/5436-69-0x00007FFB1F250000-0x00007FFB1F54C000-memory.dmp
memory/5492-50-0x00007FFB1F250000-0x00007FFB1F54C000-memory.dmp
memory/5492-42-0x00007FFB1F250000-0x00007FFB1F54C000-memory.dmp