Analysis

  • max time kernel
    150s
  • max time network
    141s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260709-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    22/08/2026, 01:46

General

  • Target
    FCFA826B899EE297DF49F4EF756857D2.exe
  • Size 45.8MB
  • Sample260822-b65azaea45
  • SHA256 2779033e8c0bd3d1c2332d1a4c498b09d2eb090fff10a5aad7adbfb3a5231d72
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Extracted

Family
  • valleyrat_s2

Version
  • 1.0

C2
  • 156.247.41.9:668

  • 127.0.0.1:80

Attributes
  • campaign_date

    2026. 8.18

Signatures

  • Family: ValleyRat

    ValleyRat stage2 is a backdoor written in C++.

  • Sets service image path in registry 3 TTPs 1 IoCs

    This determines the executable launched when a service starts. It can be used to establish persistence.

  • Executes dropped EXE 4 IoCs
  • Loads dropped DLL 11 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Enumerates connected drives 3 TTPs 22 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • UPX packed file 3 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Drops file in Program Files directory 64 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Modifies registry class 4 IoCs
  • Suspicious behavior: EnumeratesProcesses 8 IoCs
  • Suspicious behavior: LoadsDriver 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\FCFA826B899EE297DF49F4EF756857D2.exe
    "C:\Users\Admin\AppData\Local\Temp\FCFA826B899EE297DF49F4EF756857D2.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3816
    • C:\Users\Admin\AppData\Local\Temp\_ir_sf_temp_0\irsetup.exe
      "C:\Users\Admin\AppData\Local\Temp\_ir_sf_temp_0\irsetup.exe" __IRAOFF:1782018 "__IRAFN:C:\Users\Admin\AppData\Local\Temp\FCFA826B899EE297DF49F4EF756857D2.exe" "__IRCT:1" "__IRTSS:0" "__IRSID:S-1-5-21-3611646547-550105268-947503007-1000"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Drops file in Program Files directory
      • System Location Discovery: System Language Discovery
      • Modifies registry class
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:4940
      • C:\Program Files (x86)\dingtalkwHBuilder\HBuilderX.exe
        "C:\Program Files (x86)\dingtalkwHBuilder\HBuilderX.exe"
        3⤵
        • Sets service image path in registry
        • Executes dropped EXE
        • Loads dropped DLL
        • Adds Run key to start application
        • Enumerates connected drives
        • System Location Discovery: System Language Discovery
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious behavior: LoadsDriver
        • Suspicious use of AdjustPrivilegeToken
        PID:948
  • C:\Program Files (x86)\dingtalkwHBuilder\HBuilderX.exe
    "C:\\Program Files (x86)\\dingtalkwHBuilder\\HBuilderX.exe"
    1⤵
    • Executes dropped EXE
    • Loads dropped DLL
    • System Location Discovery: System Language Discovery
    PID:1488
  • C:\Program Files (x86)\dingtalkwHBuilder\HBuilderX.exe
    "C:\Program Files (x86)\dingtalkwHBuilder\HBuilderX.exe"
    1⤵
    • Executes dropped EXE
    • Loads dropped DLL
    • System Location Discovery: System Language Discovery
    PID:616

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        151.0.7922.76.manifest

        • Path C:\Program Files (x86)\dingtalkwHBuilder\151.0.7922.76.manifest
        • Size 32B
        • SHA256 4f43318e08bbfc36d8d3afc6b73e75d7ea0301fa7a210e2f0f5bd630822215c3
        • MD5 SHA1 SHA512

        HBuilderX.dll

        • Path C:\Program Files (x86)\dingtalkwHBuilder\HBuilderX.dll
        • Size 19.1MB
        • SHA256 e3734595004d49836dcc6b1d6906359b7040f9f85b3272645b28984b7d149b9e
        • MD5 SHA1 SHA512 SSDEEP TLSH

        HBuilderX.exe

        • Path C:\Program Files (x86)\dingtalkwHBuilder\HBuilderX.exe
        • Size 3.2MB
        • SHA256 03529bbc6730ea6c73ffe3fa9b35f530aaf84a409f1880c8706228d1cc9cc82d
        • MD5 SHA1 SHA512 SSDEEP TLSH

        MSVCP140.dll

        • Path C:\Program Files (x86)\dingtalkwHBuilder\MSVCP140.dll
        • Size 604KB
        • SHA256 f0cda2a0cf1fe6fbbf579b9098462329d3aaa7513a207af2e0f33b01456e388a
        • MD5 SHA1 SHA512 SSDEEP TLSH

        VCRUNTIME140.dll

        • Path C:\Program Files (x86)\dingtalkwHBuilder\VCRUNTIME140.dll
        • Size 120KB
        • SHA256 2fa6efc053203460a23d3a25158f227d895d2dadc63acc1a372da97c3a4281c3
        • MD5 SHA1 SHA512 SSDEEP TLSH

        chrome_proxy.exe

        • Path C:\Program Files (x86)\dingtalkwHBuilder\chrome_proxy.exe
        • Size 113KB
        • SHA256 01a86fc7a336571419240dfab6d87bb50b1e0e533d7e55a330dd97bc3b40ee63
        • MD5 SHA1 SHA512 SSDEEP TLSH

        irsetup.exe

        • Path C:\Users\Admin\AppData\Local\Temp\_ir_sf_temp_0\irsetup.exe
        • Size 1.3MB
        • SHA256 b15d67b4a57184e5202df3c25e20dc0b7f853f4d527d148b337138900989824a
        • MD5 SHA1 SHA512 SSDEEP TLSH

        lua5.1.dll

        • Path C:\Users\Admin\AppData\Local\Temp\_ir_sf_temp_0\lua5.1.dll
        • Size 322KB
        • SHA256 769416fa7edf38e91a55f4f7163914ee4aad9c8c890ed641c300b73157acac45
        • MD5 SHA1 SHA512 SSDEEP TLSH

        memory/948-160-0x0000000003220000-0x0000000003285000-memory.dmp

        memory/948-157-0x0000000003220000-0x0000000003285000-memory.dmp

        memory/948-144-0x00000000027F0000-0x0000000002813000-memory.dmp

        memory/948-210-0x0000000003220000-0x0000000003285000-memory.dmp

        memory/948-147-0x00000000027F0000-0x0000000002813000-memory.dmp

        memory/948-146-0x00000000027F0000-0x0000000002813000-memory.dmp

        memory/948-149-0x0000000002E60000-0x0000000002EC0000-memory.dmp

        memory/948-148-0x00000000027F0000-0x0000000002813000-memory.dmp

        memory/948-150-0x0000000003220000-0x0000000003285000-memory.dmp

        memory/948-163-0x0000000003220000-0x0000000003285000-memory.dmp

        memory/948-162-0x0000000003220000-0x0000000003285000-memory.dmp

        memory/948-161-0x0000000003220000-0x0000000003285000-memory.dmp

        memory/948-187-0x0000000003220000-0x0000000003285000-memory.dmp

        memory/948-159-0x0000000003220000-0x0000000003285000-memory.dmp

        memory/948-158-0x0000000003220000-0x0000000003285000-memory.dmp

        memory/948-145-0x00000000027F0000-0x0000000002813000-memory.dmp

        memory/948-156-0x0000000003220000-0x0000000003285000-memory.dmp

        memory/948-155-0x0000000003220000-0x0000000003285000-memory.dmp

        memory/948-154-0x0000000003220000-0x0000000003285000-memory.dmp

        memory/948-153-0x0000000003220000-0x0000000003285000-memory.dmp

        memory/948-164-0x0000000003220000-0x0000000003285000-memory.dmp

        memory/948-152-0x0000000003220000-0x0000000003285000-memory.dmp

        memory/948-151-0x0000000003220000-0x0000000003285000-memory.dmp

        memory/948-166-0x0000000003220000-0x0000000003285000-memory.dmp

        memory/948-168-0x0000000003220000-0x0000000003285000-memory.dmp

        memory/948-170-0x00000000027F0000-0x0000000002813000-memory.dmp

        memory/948-172-0x0000000010000000-0x0000000010056000-memory.dmp

        memory/948-171-0x0000000003220000-0x0000000003285000-memory.dmp

        memory/948-185-0x0000000003220000-0x0000000003285000-memory.dmp

        memory/948-188-0x0000000010000000-0x000000001005A000-memory.dmp

        memory/4940-11-0x0000000000360000-0x0000000000747000-memory.dmp

        memory/4940-135-0x0000000000360000-0x0000000000747000-memory.dmp