Analysis
- max time kernel
150s - max time network
152s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260709-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
-
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 12 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 16 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 8 IoCs
- Suspicious behavior: EnumeratesProcesses 8 IoCs
- Suspicious behavior: LoadsDriver 1 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 6 IoCs
Processes
-
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
-
C:\Windows\explorer.exeexplorer.exe shell:::{30A43AD1-0223-4AE1-A3F5-DA53B2E1A8F8}2⤵
-
-
C:\Users\Admin\AppData\Local\Temp\~tmp_90888.tmpC:\Users\Admin\AppData\Local\Temp\~tmp_90888.tmp1⤵
- Executes dropped EXE
-
C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k GPSvcGroup1⤵
-
C:\Windows\explorer.exeC:\Windows\explorer.exe /factory,{75dff2b7-6936-4c06-a8bb-676a7b00b24b} -Embedding1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
-
C:\ProgramData\OpenraVPN\Loader.exe"C:\ProgramData\OpenraVPN\Loader.exe" -onlyctrl2⤵
- 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"3⤵
- Executes a command shell one-liner
- Suspicious use of WriteProcessMemory
-
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
-
-
-
-
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
-
C:\ProgramData\OpenraVPN\Loader.exeC:\ProgramData\OpenraVPN\Loader.exe -reonlyctrl3⤵
- Enumerates connected drives
- Executes dropped EXE
- Loads dropped DLL
-
-
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
Loading Replay Monitor...
Downloads
Loader.exe
heif.dll
msvcp140.dll
vcruntime140.dll
vcruntime140_1.dll
~tmp_90888.tmp
memory/2640-18-0x00007FFA44510000-0x00007FFA4480C000-memory.dmp
memory/2640-8-0x00007FFA44510000-0x00007FFA4480C000-memory.dmp
memory/2704-53-0x0000000140000000-0x000000014002A000-memory.dmp
memory/2704-47-0x00007FFA44510000-0x00007FFA4480C000-memory.dmp
memory/2704-44-0x00007FFA44510000-0x00007FFA4480C000-memory.dmp
memory/2704-51-0x0000000140000000-0x000000014002A000-memory.dmp
memory/2704-52-0x0000000140000000-0x000000014002A000-memory.dmp
memory/2704-59-0x0000000140000000-0x000000014002A000-memory.dmp
memory/2704-56-0x00000145636B0000-0x0000014563700000-memory.dmp
memory/2704-57-0x00000145636B0000-0x0000014563700000-memory.dmp
memory/2704-55-0x00000145636B0000-0x0000014563700000-memory.dmp
memory/2704-54-0x0000000140000000-0x000000014002A000-memory.dmp
memory/2704-60-0x0000000140000000-0x000000014002A000-memory.dmp
memory/4608-25-0x00007FFA44510000-0x00007FFA4480C000-memory.dmp
memory/4608-36-0x00007FFA44510000-0x00007FFA4480C000-memory.dmp
memory/4608-45-0x00007FFA44510000-0x00007FFA4480C000-memory.dmp
memory/4752-19-0x00007FFA44810000-0x00007FFA44B0C000-memory.dmp
memory/4752-0-0x00007FFA44810000-0x00007FFA44B0C000-memory.dmp
memory/5824-14-0x00007FFA44510000-0x00007FFA4480C000-memory.dmp
memory/5824-34-0x00007FFA44510000-0x00007FFA4480C000-memory.dmp
memory/5824-33-0x0000000140000000-0x000000014002A000-memory.dmp
memory/5824-30-0x0000019329430000-0x0000019329480000-memory.dmp
memory/5824-31-0x0000019329430000-0x0000019329480000-memory.dmp
memory/5824-28-0x0000000140000000-0x000000014002A000-memory.dmp
memory/5824-29-0x0000019329430000-0x0000019329480000-memory.dmp
memory/5824-27-0x0000000140000000-0x000000014002A000-memory.dmp
memory/5824-26-0x0000000140000000-0x000000014002A000-memory.dmp
memory/5824-16-0x0000000140000000-0x000000014002A000-memory.dmp