Analysis

  • max time kernel
    148s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    27-06-2024 22:06

General

  • Target

    index.exe

  • Size

    36.2MB

  • MD5

    aa55396d7df072973d0ea88ec505579d

  • SHA1

    8a9b057a859cee6ca3053dc0ef05089bbf2ac4ab

  • SHA256

    375f99f85beb8bc69029429b3c5317543957ffa7ba559da6fd4b930ce48bfc7c

  • SHA512

    969b634ed5aa5075b9b48ebabcf0e9093c530578ec292e67582db16f84437f4a2823130e354b0054f909ec361b145dc4236b57a9991d4974738924f44e06a2ff

  • SSDEEP

    393216:f1Du8BtuBw2FEL3Z3aLUoQvo6LP/SgbSpYvKEh1EdKwlGQKPJuGsiTfREsrgCYfG:fMguj8Q4VfvvqFTrYmi

Malware Config

Extracted

Family

quasar

Version

3.1.5

Botnet

SeroXen

C2

147.185.221.20:47638

Mutex

$Sxr-GV6wZsGZZMeZ3qfenc

Attributes
  • encryption_key

    pCYwpdVg3UP8ZY0FIEl9

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Defender Anti-Malware Disable Startup

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 10 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\index.exe
    "C:\Users\Admin\AppData\Local\Temp\index.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2836
    • C:\Windows\system32\cmd.exe
      cmd.exe /C call powershell -E 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
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3576
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        powershell -E 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
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4104
        • C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe
          "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\zztiz1ya\zztiz1ya.cmdline"
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:3864
          • C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe
            C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RES6DDD.tmp" "c:\Users\Admin\AppData\Local\Temp\zztiz1ya\CSCE67F815A423A43EB8D3D5E4C98FA1432.TMP"
            5⤵
              PID:4472
      • C:\Windows\system32\cmd.exe
        cmd.exe /C call C:\Users\Admin\AppData\Local\Temp\89435a09aea852638faa0bf902e7b347.bat
        2⤵
          PID:2868
      • C:\Windows\system32\AUDIODG.EXE
        C:\Windows\system32\AUDIODG.EXE 0x244 0x4a8
        1⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:4544

      Network

      MITRE ATT&CK Matrix

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Local\Temp\89435a09aea852638faa0bf902e7b347.bat

        Filesize

        409KB

        MD5

        ef652484dc356b0bc87741f24f2ade24

        SHA1

        f988ef8700c1ed15fa42f9a5756471d6bc18c9c8

        SHA256

        e5e973ff9fe9b009638fc6f8e3b10ca9acad76d2c6cf887f82b018e5a39aa225

        SHA512

        fae5a830fc64a0599686368ca0d3826e4ada1ec383f6faae19054d61bee285442b7471c8f18faf4d378ea025128cab974c50a0cd8f8daf892c6107d812662fec

      • C:\Users\Admin\AppData\Local\Temp\RES6DDD.tmp

        Filesize

        1KB

        MD5

        e29a9561260bc2acb2d39b5ebd4fbbfb

        SHA1

        1b49a89d1096db2b958700252b92aa875a6ed34b

        SHA256

        50cee6143d9426165b063da75e03003d8fb9daa422ecac1afc580be66eef742a

        SHA512

        be2a1573a28d1e197d4d4af8a7d4443877c40fb95b403a2474c4fac0574b06d312da1874047d15e9abe52e83a08fb7b1b31bf38d7122dc63ea40a008cf282bd2

      • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_em0nffgb.zhe.ps1

        Filesize

        60B

        MD5

        d17fe0a3f47be24a6453e9ef58c94641

        SHA1

        6ab83620379fc69f80c0242105ddffd7d98d5d9d

        SHA256

        96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

        SHA512

        5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

      • C:\Users\Admin\AppData\Local\Temp\zztiz1ya\zztiz1ya.dll

        Filesize

        3KB

        MD5

        343ba1527e7369deadfd30c706f080d8

        SHA1

        5ba15adfe09cc99cfe255970aa7fd536e8b57a3c

        SHA256

        e14ec6ea431dfe871cc5de307e9735a176a5778c8297dba648e065e36cfd24b2

        SHA512

        6f822ad735357bcf480e5d01295adde5450a0a1a18ea0178c46c8a4b3351d4b61a83d1f9ee0e8730dc907fa5db1fe8ec46c0c0a7e198a9b1357d6b4ebd104dba

      • \??\c:\Users\Admin\AppData\Local\Temp\zztiz1ya\CSCE67F815A423A43EB8D3D5E4C98FA1432.TMP

        Filesize

        652B

        MD5

        8eb172d02ceca693d2a57842e6eb90a8

        SHA1

        ec7c1c73f8e82fb8d041f64769e0208165eddc16

        SHA256

        3aaad5a68403c9df8099a7bd96a6155c8dff6987f7d5763f73444101ed40207f

        SHA512

        d25edbe53725d62956dc03c1da7a74ecba4bc2f25e0f4ad4555625168a47a033f0d74b49eb90ef4d1ecb1dd8262c14e5153ebee0273469134048779c263ddbca

      • \??\c:\Users\Admin\AppData\Local\Temp\zztiz1ya\zztiz1ya.0.cs

        Filesize

        737B

        MD5

        3d57f8f44297464baafa6aeecd3bf4bc

        SHA1

        f370b4b9f8dba01fbcad979bd663d341f358a509

        SHA256

        415199eec01052503978381a4f88f4cd970b441fedce519905990ed8b629b0f1

        SHA512

        4052dd65ca0a505a36c7c344671afcadb8f82cc24b0d1d8362f61565f9d37782e00332908444f6a95286dd1785d074762b27c20be1f361eec67807fad052d798

      • \??\c:\Users\Admin\AppData\Local\Temp\zztiz1ya\zztiz1ya.cmdline

        Filesize

        369B

        MD5

        6fb9d8678d3a39cb4ca19d51bbbfbe99

        SHA1

        257d26f7403d0e123e4e1e10f304c665a63ba7ce

        SHA256

        1dd38e11b6821bfe7aa3bb54c4bcf0b940d0fbc1f1366ef9d6fa29062154adcf

        SHA512

        38c0ed12233ae13a719b1db452ba9cd8385b616dd7ce2bc343866a65d36f1dadcb4e1cee7f6daeaf8b0457adbbc73bdb8d8d7fa92a519ce380487b9e3297a686

      • memory/4104-15-0x00007FFEE9030000-0x00007FFEE9AF1000-memory.dmp

        Filesize

        10.8MB

      • memory/4104-14-0x00007FFEE9030000-0x00007FFEE9AF1000-memory.dmp

        Filesize

        10.8MB

      • memory/4104-9-0x000001D6EFE60000-0x000001D6EFE82000-memory.dmp

        Filesize

        136KB

      • memory/4104-28-0x000001D6EFFB0000-0x000001D6EFFB8000-memory.dmp

        Filesize

        32KB

      • memory/4104-3-0x00007FFEE9033000-0x00007FFEE9035000-memory.dmp

        Filesize

        8KB

      • memory/4104-32-0x00007FFEE9030000-0x00007FFEE9AF1000-memory.dmp

        Filesize

        10.8MB