Analysis

  • max time kernel
    149s
  • max time network
    147s
  • platform
    windows10-ltsc_2021_x64
  • resource
    win10ltsc2021-20250314-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20250314-enlocale:en-usos:windows10-ltsc_2021-x64system
  • submitted
    03/04/2025, 17:38

General

  • Target

    Google AI Browser v1.3.3.msi

  • Size

    68.9MB

  • MD5

    fab734d9abaa41a7c47795c828419bbc

  • SHA1

    f6c4d2800b8658f4d21c6c6438109829fbb722c0

  • SHA256

    2974e4eb86ceb963caf3b6dbca86995bd31955df16b00e5735178a4a98b85e00

  • SHA512

    0ea366f757e84253a7583b77bdffa16ce74e92a20cd4dde4e0a3fcede0a6a258e9ff3cfb5def49a7fde3d1ee1309fe54683b41986e3ac4ec136757d666714678

  • SSDEEP

    1572864:n0uJbTTPj3Rbu7Fh0Cv7OuQ5kVxc6sj/kcAXpUmUewr5/Rf3C/mAmhen3Z/:FvT9u7Ak7OuQ16sEZUm6r5JV

Malware Config

Extracted

Family

valleyrat_s2

Version

1.0

C2

23.133.4.6:6666

23.133.4.6:7777

127.0.0.1:80

Attributes
  • campaign_date

    2025. 3. 2

Signatures

  • ValleyRat

    ValleyRat stage2 is a backdoor written in C++.

  • Valleyrat_s2 family
  • Enumerates connected drives 3 TTPs 64 IoCs

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

  • Drops file in Windows directory 10 IoCs
  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 9 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

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

  • Checks SCSI registry key(s) 3 TTPs 5 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Modifies data under HKEY_USERS 3 IoCs
  • Modifies registry class 23 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 11 IoCs
  • Uses Volume Shadow Copy service COM API

    The Volume Shadow Copy service is used to manage backups/snapshots.

Processes

  • C:\Windows\system32\msiexec.exe
    msiexec.exe /I "C:\Users\Admin\AppData\Local\Temp\Google AI Browser v1.3.3.msi"
    1⤵
    • Enumerates connected drives
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of FindShellTrayWindow
    PID:4552
  • C:\Windows\system32\msiexec.exe
    C:\Windows\system32\msiexec.exe /V
    1⤵
    • Enumerates connected drives
    • Drops file in Windows directory
    • Modifies data under HKEY_USERS
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:852
    • C:\Windows\syswow64\MsiExec.exe
      C:\Windows\syswow64\MsiExec.exe -Embedding F9FE30B5166D64E20FE751038EA7C1C9 C
      2⤵
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      PID:4288
    • C:\Windows\system32\srtasks.exe
      C:\Windows\system32\srtasks.exe ExecuteScopeRestorePoint /WaitForRestorePoint:2
      2⤵
        PID:5984
      • C:\Windows\syswow64\MsiExec.exe
        C:\Windows\syswow64\MsiExec.exe -Embedding E6A3013A549ACF246705D542D989DD2B
        2⤵
        • Loads dropped DLL
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:4080
        • C:\Users\Admin\AppData\Roaming\Mancyag\Google AI Browser v1.3.3\uc.exe
          "C:\Users\Admin\AppData\Roaming\Mancyag\Google AI Browser v1.3.3\uc.exe"
          3⤵
          • Enumerates connected drives
          • Executes dropped EXE
          • Loads dropped DLL
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: AddClipboardFormatListener
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of SetWindowsHookEx
          PID:5576
    • C:\Windows\system32\vssvc.exe
      C:\Windows\system32\vssvc.exe
      1⤵
      • Checks SCSI registry key(s)
      PID:60

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\Config.Msi\e59233f.rbs

      Filesize

      20KB

      MD5

      df299a2a7721361459b33a765631c49e

      SHA1

      85c80c0fe2f171b95b1c00b45af0fa0cc63184b4

      SHA256

      343dd80c174c6e16300a51ebe1f80cbb22f82f7875d0ac75c4195730e5b99e47

      SHA512

      d22a26737f608691875891db6f6938dd5d11a76c2766f94af718ace1d3ef9fa21c8b6526a84effa7f9ee06d22341dbfed2ac6eaaaa4163efb86ae436b1f246f8

    • C:\ProgramData\11UCore3.cpy

      Filesize

      229KB

      MD5

      003a41d52177c23eb8e3a7ced50324ae

      SHA1

      29b04e9c7f4262e5fdd7f487d3abc71a69b2de95

      SHA256

      0d27409ef8c71e81534006253109ce1072ad55cbf8a10a72b694426a45f6562b

      SHA512

      7b72294dba4d47ff4a41b3ff4ceefb7dbf2961928c1175ccc87b07852c1595d91892c2b29a5d294a0332ff9bb28ac32c4f963c40c58a7f8d9fb2829037cd4772

    • C:\Users\Admin\AppData\Local\Temp\MSI9829.tmp

      Filesize

      436KB

      MD5

      475d20c0ea477a35660e3f67ecf0a1df

      SHA1

      67340739f51e1134ae8f0ffc5ae9dd710e8e3a08

      SHA256

      426e6cf199a8268e8a7763ec3a4dd7add982b28c51d89ebea90ca792cbae14dd

      SHA512

      99525aaab2ab608134b5d66b5313e7fc3c2e2877395c5c171897d7a6c66efb26b606de1a4cb01118c2738ea4b6542e4eb4983e631231b3f340bf85e509a9589e

    • C:\Users\Admin\AppData\Roaming\Mancyag\Google AI Browser v1.3.3\11UCore.dll

      Filesize

      725KB

      MD5

      f445081a2d57529ecf5404b4ee58bfe0

      SHA1

      7f52c1e26ecd229e1d0624d8e5b32bc9087c23b0

      SHA256

      632feb47233ed59b5c90f1d80d502e700b3a365238b6f82fc14f5d72da7f670c

      SHA512

      6bded997b5f1bafffc5b91eb940868d71a4a1420ccfc1ad4b449fc85151af4cebb9410df2be48bb4eac6b095c3414829db32c84aedbb9b0028443dd022d93ed0

    • C:\Users\Admin\AppData\Roaming\Mancyag\Google AI Browser v1.3.3\uc.exe

      Filesize

      1.3MB

      MD5

      0318aa67eaebc33d51ad2f675536bac1

      SHA1

      2355fc33db6eef7b6d6abd93fb148109db4c3e5f

      SHA256

      9f8d81705e17df1fb0ac6288455d7d52ce64abdc8fc4ea6ec917f18baeae8ee0

      SHA512

      e0a39951c4a25aa17c16e0636218ed490212d6fcf9f8602ff64af497f103604857d735b6f391a83df314157adfc05b2c31cca5589e76b96dbdbfbf5177799647

    • C:\Users\Admin\AppData\Roaming\Mancyag\Google AI Browser v1.3.3\update.cab

      Filesize

      137KB

      MD5

      b7ccf4e5b87bcd55479c86024ef8bde5

      SHA1

      a3a36e99e2425d696cea65a18fccd25fa2be81a7

      SHA256

      c57fd5f1a50186b87c6a50ad71524992aafb33bcac5b54b0538aa66382efe6bd

      SHA512

      79767eeda8a30edc27c18382c7e98cf0298977d3f7c16a874ecb2263e93bd90ecae592cbf53e57c1f458ca4994835e2f925b922272e8ec4331da645dd959cd72

    • \??\GLOBALROOT\Device\HarddiskVolumeShadowCopy2\System Volume Information\SPP\metadata-2

      Filesize

      24.0MB

      MD5

      64becbcdddb5bd555d3264191377e1b8

      SHA1

      8c852cda8409e2e71e41effd30706db2abffb31a

      SHA256

      86ea00a2bcca32c53414549e8fa9404b75dff8a3cbc6ae84854cd7fa36b55b72

      SHA512

      639532ee14d6621b80d45221d5ec487f739d75019c13853c0b88801f5d403ed9d425f083631c4af7779d5a712c55a466a2ff17fbb3b40f3254025a47ca47e1b3

    • \??\Volume{894291df-0000-0000-0000-d08302000000}\System Volume Information\SPP\OnlineMetadataCache\{ea0f8ccb-2d78-4a00-9bd9-44ee12c788f5}_OnDiskSnapshotProp

      Filesize

      6KB

      MD5

      1d5a08f288f73d7702233e611e56bd4e

      SHA1

      63530428dbaaf65244dd876028598d63af225a56

      SHA256

      6f7e73af13300145105c8d5aab0c75df78f16542fb863a9f2c527095b5eab559

      SHA512

      e256e6a7031a8e450b09ac70d5e458ab53864322f5fcd522d032555cc32cc062602bfdc690fe32c04d388722bfa8130aba83ae9bfb7a87cafb6e4e11431c4d3e

    • memory/4080-113-0x0000000074DE0000-0x0000000074E5C000-memory.dmp

      Filesize

      496KB

    • memory/5576-127-0x0000000003E40000-0x0000000003E98000-memory.dmp

      Filesize

      352KB

    • memory/5576-128-0x00000000035A0000-0x00000000036A0000-memory.dmp

      Filesize

      1024KB

    • memory/5576-121-0x00000000035A0000-0x00000000036A0000-memory.dmp

      Filesize

      1024KB

    • memory/5576-122-0x00000000035A0000-0x00000000036A0000-memory.dmp

      Filesize

      1024KB

    • memory/5576-123-0x0000000003E40000-0x0000000003E98000-memory.dmp

      Filesize

      352KB

    • memory/5576-124-0x0000000003E40000-0x0000000003E98000-memory.dmp

      Filesize

      352KB

    • memory/5576-125-0x0000000003E40000-0x0000000003E98000-memory.dmp

      Filesize

      352KB

    • memory/5576-126-0x0000000003E40000-0x0000000003E98000-memory.dmp

      Filesize

      352KB

    • memory/5576-119-0x00000000035A0000-0x00000000036A0000-memory.dmp

      Filesize

      1024KB

    • memory/5576-120-0x00000000035A0000-0x00000000036A0000-memory.dmp

      Filesize

      1024KB

    • memory/5576-129-0x00000000035A0000-0x00000000036A0000-memory.dmp

      Filesize

      1024KB

    • memory/5576-116-0x00000000033A0000-0x00000000034A0000-memory.dmp

      Filesize

      1024KB

    • memory/5576-118-0x00000000035A0000-0x00000000036A0000-memory.dmp

      Filesize

      1024KB

    • memory/5576-132-0x0000000074DE0000-0x0000000074E5C000-memory.dmp

      Filesize

      496KB

    • memory/5576-134-0x0000000010000000-0x0000000010038000-memory.dmp

      Filesize

      224KB

    • memory/5576-133-0x0000000003E40000-0x0000000003E98000-memory.dmp

      Filesize

      352KB

    • memory/5576-138-0x0000000003E40000-0x0000000003E98000-memory.dmp

      Filesize

      352KB

    • memory/5576-141-0x0000000003E40000-0x0000000003E98000-memory.dmp

      Filesize

      352KB

    • memory/5576-140-0x0000000003E40000-0x0000000003E98000-memory.dmp

      Filesize

      352KB