Analysis

  • max time kernel
    149s
  • max time network
    141s
  • platform
    windows11-21h2_x64
  • resource
    win11-20250313-en
  • resource tags

    arch:x64arch:x86image:win11-20250313-enlocale:en-usos:windows11-21h2-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 14 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:3548
  • 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:3844
    • C:\Windows\syswow64\MsiExec.exe
      C:\Windows\syswow64\MsiExec.exe -Embedding 2B1B2E2D2D0B928B9F9741973A100E6D C
      2⤵
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      PID:5004
    • C:\Windows\system32\srtasks.exe
      C:\Windows\system32\srtasks.exe ExecuteScopeRestorePoint /WaitForRestorePoint:2
      2⤵
        PID:2628
      • C:\Windows\syswow64\MsiExec.exe
        C:\Windows\syswow64\MsiExec.exe -Embedding C62114AECA13F49AB431DEABDCD634CA
        2⤵
        • Loads dropped DLL
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:3672
        • 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:3052
    • C:\Windows\system32\vssvc.exe
      C:\Windows\system32\vssvc.exe
      1⤵
      • Checks SCSI registry key(s)
      PID:1104

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\Config.Msi\e5926f8.rbs

      Filesize

      20KB

      MD5

      cc304074db7d45852df2a8229eeca857

      SHA1

      ce74a4a94922862e2f9f5a841d79257e9fc043a8

      SHA256

      67ade901be284b0fe750f97f9fa4d80ac5d7a8a9d1ab98e69b5250d77f3ab28e

      SHA512

      6fff03e5254699ac3de0490d0dd869c9b2abef2103672055c9f1f73f00b608332704c88a047aaaae7fa3110ef5920943487a8ff0e56d66ded061592bd178f530

    • C:\ProgramData\11UCore3.cpy

      Filesize

      229KB

      MD5

      003a41d52177c23eb8e3a7ced50324ae

      SHA1

      29b04e9c7f4262e5fdd7f487d3abc71a69b2de95

      SHA256

      0d27409ef8c71e81534006253109ce1072ad55cbf8a10a72b694426a45f6562b

      SHA512

      7b72294dba4d47ff4a41b3ff4ceefb7dbf2961928c1175ccc87b07852c1595d91892c2b29a5d294a0332ff9bb28ac32c4f963c40c58a7f8d9fb2829037cd4772

    • C:\Users\Admin\AppData\Local\Temp\MSI7FBF.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

      24.6MB

      MD5

      6c0e0c5f529845a10448ba6292bfd44a

      SHA1

      f876546a173062d775ab3ff574765801a2007e7a

      SHA256

      8fd162b6897cbcb6e43ae3453af4e500577d8449fb6d2ece1ab9e6830c1fbd4d

      SHA512

      1139df404c4fe626dec526145b9a3fea87475d6e399815c601c1c7ea21a569df088c86bacdbe2713778d251e205bbb88be2ea2fe8902a4b8cb2eec19735712f8

    • \??\Volume{3463923c-0000-0000-0000-d01200000000}\System Volume Information\SPP\OnlineMetadataCache\{b1c3a84d-868d-41ed-bdb4-8fa1cdbb975e}_OnDiskSnapshotProp

      Filesize

      6KB

      MD5

      51a4aab6a09d17394855811053ffe6a0

      SHA1

      2587f278c27469e50ad0df6a375245b770cfae99

      SHA256

      fbca3b94082e0c3a895142a201b210606c62ca4b981a38cdc140b0cab8f96219

      SHA512

      59dc97521502b9ed214ac90a6ca7866c463d07949f98e39cf25690977d7bf9f7f1ccc33cdb1015c6d1088d3662da4c97f669900531fee07da62ec3db9f62c20b

    • memory/3052-124-0x0000000002F20000-0x0000000003020000-memory.dmp

      Filesize

      1024KB

    • memory/3052-127-0x0000000003750000-0x00000000037A8000-memory.dmp

      Filesize

      352KB

    • memory/3052-120-0x0000000002F20000-0x0000000003020000-memory.dmp

      Filesize

      1024KB

    • memory/3052-121-0x0000000002F20000-0x0000000003020000-memory.dmp

      Filesize

      1024KB

    • memory/3052-119-0x0000000002F20000-0x0000000003020000-memory.dmp

      Filesize

      1024KB

    • memory/3052-118-0x0000000002F20000-0x0000000003020000-memory.dmp

      Filesize

      1024KB

    • memory/3052-140-0x0000000003750000-0x00000000037A8000-memory.dmp

      Filesize

      352KB

    • memory/3052-125-0x0000000003750000-0x00000000037A8000-memory.dmp

      Filesize

      352KB

    • memory/3052-126-0x0000000003750000-0x00000000037A8000-memory.dmp

      Filesize

      352KB

    • memory/3052-116-0x0000000002D20000-0x0000000002E20000-memory.dmp

      Filesize

      1024KB

    • memory/3052-128-0x0000000003750000-0x00000000037A8000-memory.dmp

      Filesize

      352KB

    • memory/3052-129-0x0000000003750000-0x00000000037A8000-memory.dmp

      Filesize

      352KB

    • memory/3052-130-0x0000000074D00000-0x0000000074D7C000-memory.dmp

      Filesize

      496KB

    • memory/3052-131-0x0000000002F20000-0x0000000003020000-memory.dmp

      Filesize

      1024KB

    • memory/3052-132-0x0000000002F20000-0x0000000003020000-memory.dmp

      Filesize

      1024KB

    • memory/3052-133-0x0000000003750000-0x00000000037A8000-memory.dmp

      Filesize

      352KB

    • memory/3052-134-0x0000000010000000-0x0000000010038000-memory.dmp

      Filesize

      224KB

    • memory/3052-138-0x0000000003750000-0x00000000037A8000-memory.dmp

      Filesize

      352KB

    • memory/3052-139-0x0000000003750000-0x00000000037A8000-memory.dmp

      Filesize

      352KB

    • memory/3672-113-0x0000000074D00000-0x0000000074D7C000-memory.dmp

      Filesize

      496KB