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Analysis

  • max time kernel
    142s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    01/02/2025, 03:52

General

  • Target

    f9fc23fe47d3c918c7bc24cbe14e56d9b0024e31660f2a280f3991291b3e5882.exe

  • Size

    3.2MB

  • MD5

    f31a91bff6bb5805f4f7b95c0a27cb2a

  • SHA1

    8eeef2262c4288c035d7be99f27ce478dae008ce

  • SHA256

    f9fc23fe47d3c918c7bc24cbe14e56d9b0024e31660f2a280f3991291b3e5882

  • SHA512

    07f750faf48ef505de12a07acf64136468702ba07d7b5ec9ecbc3d2f6e5c04c3c7ce0ff4b178c5f2f3a1df2b9b0ea8f54687f90137fa58603ddd0896733eaacb

  • SSDEEP

    98304:p1AhvWM65Mf9cZR4FklYJr41ADevpgaSoJxqGT4q:WvWM6iGKkCJ0GevCaXsi4q

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

svhost32

C2

185.147.125.77:4782

Mutex

9500f2e5-aa22-4d12-a2ea-09ddc5050666

Attributes
  • encryption_key

    BD29CA798222621C677ECD67804E6D9D0A95CFCB

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar family
  • Quasar payload 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 8 IoCs
  • Checks installed software on the system 1 TTPs

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

  • Command and Scripting Interpreter: PowerShell 1 TTPs 5 IoCs

    Run Powershell to execute payload.

  • 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.

  • Suspicious behavior: EnumeratesProcesses 22 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 22 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\f9fc23fe47d3c918c7bc24cbe14e56d9b0024e31660f2a280f3991291b3e5882.exe
    "C:\Users\Admin\AppData\Local\Temp\f9fc23fe47d3c918c7bc24cbe14e56d9b0024e31660f2a280f3991291b3e5882.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1916
    • C:\Users\Admin\AppData\Local\Temp\is-RM034.tmp\f9fc23fe47d3c918c7bc24cbe14e56d9b0024e31660f2a280f3991291b3e5882.tmp
      "C:\Users\Admin\AppData\Local\Temp\is-RM034.tmp\f9fc23fe47d3c918c7bc24cbe14e56d9b0024e31660f2a280f3991291b3e5882.tmp" /SL5="$100062,2958433,245248,C:\Users\Admin\AppData\Local\Temp\f9fc23fe47d3c918c7bc24cbe14e56d9b0024e31660f2a280f3991291b3e5882.exe"
      2⤵
      • Checks computer location settings
      • Executes dropped EXE
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:4264
      • C:\Users\Admin\AppData\Local\Temp\f9fc23fe47d3c918c7bc24cbe14e56d9b0024e31660f2a280f3991291b3e5882.exe
        "C:\Users\Admin\AppData\Local\Temp\f9fc23fe47d3c918c7bc24cbe14e56d9b0024e31660f2a280f3991291b3e5882.exe" /VERYSILENT
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:2724
        • C:\Users\Admin\AppData\Local\Temp\is-G3HVK.tmp\f9fc23fe47d3c918c7bc24cbe14e56d9b0024e31660f2a280f3991291b3e5882.tmp
          "C:\Users\Admin\AppData\Local\Temp\is-G3HVK.tmp\f9fc23fe47d3c918c7bc24cbe14e56d9b0024e31660f2a280f3991291b3e5882.tmp" /SL5="$5020C,2958433,245248,C:\Users\Admin\AppData\Local\Temp\f9fc23fe47d3c918c7bc24cbe14e56d9b0024e31660f2a280f3991291b3e5882.exe" /VERYSILENT
          4⤵
          • Executes dropped EXE
          • Loads dropped DLL
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of FindShellTrayWindow
          • Suspicious use of WriteProcessMemory
          PID:3020
          • C:\Windows\SysWOW64\regsvr32.exe
            "regsvr32.exe" /s /i:SYNC "C:\Users\Admin\AppData\Roaming\\7ntdll.drv"
            5⤵
            • Loads dropped DLL
            • System Location Discovery: System Language Discovery
            • Suspicious use of WriteProcessMemory
            PID:4760
            • C:\Windows\system32\regsvr32.exe
              /s /i:SYNC "C:\Users\Admin\AppData\Roaming\\7ntdll.drv"
              6⤵
              • Loads dropped DLL
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of SetWindowsHookEx
              • Suspicious use of WriteProcessMemory
              PID:4448
              • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                "powershell" -Command "if (Get-ScheduledTask | Where-Object { $_.Actions.Execute -eq 'regsvr32' -and $_.Actions.Arguments -eq '/S /i:SYNC C:\Users\Admin\AppData\Roaming\7ntdll.drv' }) { exit 0 } else { exit 1 }"
                7⤵
                • Command and Scripting Interpreter: PowerShell
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:4288
              • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                "powershell" "Register-ScheduledTask -Action (New-ScheduledTaskAction -Execute \"regsvr32\" -Argument \"/S /i:SYNC C:\Users\Admin\AppData\Roaming\7ntdll.drv\") -Trigger (New-ScheduledTaskTrigger -Once -At (Get-Date).AddMinutes(1) -RepetitionInterval (New-TimeSpan -Minutes 1)) -TaskName 'MicrosoftEdgeUpdateTaskMachineUA{25166E3C-D0CA-4F9A-F816-94A18FCDCEC0}' -Description 'MicrosoftEdgeUpdateTaskMachineUA' -Settings (New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -DontStopIfGoingOnBatteries -ExecutionTimeLimit 0) -RunLevel Highest"
                7⤵
                • Command and Scripting Interpreter: PowerShell
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:2740
  • C:\Windows\system32\regsvr32.EXE
    C:\Windows\system32\regsvr32.EXE /S /i:SYNC C:\Users\Admin\AppData\Roaming\7ntdll.drv
    1⤵
    • Loads dropped DLL
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:3268
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell" -Command "if (Get-ScheduledTask | Where-Object { $_.Actions.Execute -eq 'regsvr32' -and $_.Actions.Arguments -eq '/S /i:SYNC C:\Users\Admin\AppData\Roaming\7ntdll.drv' }) { exit 0 } else { exit 1 }"
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      PID:4676
  • C:\Windows\system32\regsvr32.EXE
    C:\Windows\system32\regsvr32.EXE /S /i:SYNC C:\Users\Admin\AppData\Roaming\7ntdll.drv
    1⤵
    • Loads dropped DLL
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:3320
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell" -Command "if (Get-ScheduledTask | Where-Object { $_.Actions.Execute -eq 'regsvr32' -and $_.Actions.Arguments -eq '/S /i:SYNC C:\Users\Admin\AppData\Roaming\7ntdll.drv' }) { exit 0 } else { exit 1 }"
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      PID:3704

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

    Filesize

    3KB

    MD5

    661739d384d9dfd807a089721202900b

    SHA1

    5b2c5d6a7122b4ce849dc98e79a7713038feac55

    SHA256

    70c3ecbaa6df88e88df4efc70968502955e890a2248269641c4e2d4668ef61bf

    SHA512

    81b48ae5c4064c4d9597303d913e32d3954954ba1c8123731d503d1653a0d848856812d2ee6951efe06b1db2b91a50e5d54098f60c26f36bc8390203f4c8a2d8

  • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

    Filesize

    1KB

    MD5

    5a0c98d318ed5c510c1c9be11bfdaed7

    SHA1

    6c1eaf7ee000d82a2aaa0e9133dcd93d5d47afb6

    SHA256

    57a94379695470fe1f72b5ac0a5fc46402b2bba69fd822887f4b47302d919b93

    SHA512

    88b0af250410d81b62ab73e627426681b00706b6bbed16293f160b4e206e8fad0b83f44e2ecf7923fee9f93fa22a263377dc79ff56b3e14aa9e27b927fa1020a

  • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

    Filesize

    1KB

    MD5

    fa4503496ae0b44763bf00ef408de48f

    SHA1

    f723db7d07a8801fc280e68e4dd36f9ca46a80d1

    SHA256

    ca563ca6da047d137ff579f11b4672b20370568f143427ce82281ae02adb390e

    SHA512

    43977ab781bbb2672db785927c88e4a76bbc888eefe4bdaeb9339bb622d4902320a6fc2b778081623f1ab1d3e1b54beb87d90c9ffbe3f6ea5abae9d9759a80fb

  • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

    Filesize

    1KB

    MD5

    71c4b1323b5c2b0b3dce79a418170c57

    SHA1

    f2484755165cc812bd2017c3ff93d7aef8e9f642

    SHA256

    b7151a59702581451ad3accb25d5aa7889a4d385142568331f42b0fcc2019872

    SHA512

    9048311d8ca08c33c090038fce1b5f28d22e1b9b0c1a6bb27f97619c778e2d474a3f10ab92c76bd487b94e059b5d066d1d960eec15b6a3a74355099494172e51

  • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_oc0iiewk.wln.ps1

    Filesize

    60B

    MD5

    d17fe0a3f47be24a6453e9ef58c94641

    SHA1

    6ab83620379fc69f80c0242105ddffd7d98d5d9d

    SHA256

    96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

    SHA512

    5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

  • C:\Users\Admin\AppData\Local\Temp\is-RM034.tmp\f9fc23fe47d3c918c7bc24cbe14e56d9b0024e31660f2a280f3991291b3e5882.tmp

    Filesize

    1.2MB

    MD5

    70fcedd0d46d1c97af8e3eb4868c5bf1

    SHA1

    42ae1e3080be4720fc1bb97ef63d59f2f26e1558

    SHA256

    fcae74ccb09740303d86a88dd07db209721458e8eb48697f1c7d666a67dd5a07

    SHA512

    2cc42882fbdcd3d8bc4c3caa2116b76bd65fccff35e6058cfe67a80a307251b77bcbf17ddbd51e9d566f6810ac95ea33848da2a733cab6135d399dfaaf0c1020

  • C:\Users\Admin\AppData\Local\Temp\is-S60UE.tmp\_isetup\_shfoldr.dll

    Filesize

    22KB

    MD5

    92dc6ef532fbb4a5c3201469a5b5eb63

    SHA1

    3e89ff837147c16b4e41c30d6c796374e0b8e62c

    SHA256

    9884e9d1b4f8a873ccbd81f8ad0ae257776d2348d027d811a56475e028360d87

    SHA512

    9908e573921d5dbc3454a1c0a6c969ab8a81cc2e8b5385391d46b1a738fb06a76aa3282e0e58d0d2ffa6f27c85668cd5178e1500b8a39b1bbae04366ae6a86d3

  • C:\Users\Admin\AppData\Local\Temp\is-ST74Q.tmp\_isetup\_isdecmp.dll

    Filesize

    13KB

    MD5

    a813d18268affd4763dde940246dc7e5

    SHA1

    c7366e1fd925c17cc6068001bd38eaef5b42852f

    SHA256

    e19781aabe466dd8779cb9c8fa41bbb73375447066bb34e876cf388a6ed63c64

    SHA512

    b310ed4cd2e94381c00a6a370fcb7cc867ebe425d705b69caaaaffdafbab91f72d357966916053e72e68ecf712f2af7585500c58bb53ec3e1d539179fcb45fb4

  • C:\Users\Admin\AppData\Roaming\7ntdll.drv

    Filesize

    4.2MB

    MD5

    0964f6b8db5ffcd0f8817a752ab91fc0

    SHA1

    1c625ee61cff5f030d080e8124b134542e1ceae7

    SHA256

    5f69aad1615fa97e4204b25c0bdcab15bc009f4368d8e15981dfbd3b1bb5f8f0

    SHA512

    2428f2dca314526df68ac5c3e142fc114166f2301d15aa5da5e9c2cdca2071709e806bcc94790f665fdd77d454107a0786f5314bcdedf4ce01280af729e568b6

  • memory/1916-0-0x0000000000400000-0x0000000000446000-memory.dmp

    Filesize

    280KB

  • memory/1916-2-0x0000000000401000-0x0000000000417000-memory.dmp

    Filesize

    88KB

  • memory/1916-27-0x0000000000400000-0x0000000000446000-memory.dmp

    Filesize

    280KB

  • memory/2724-53-0x0000000000400000-0x0000000000446000-memory.dmp

    Filesize

    280KB

  • memory/2724-21-0x0000000000400000-0x0000000000446000-memory.dmp

    Filesize

    280KB

  • memory/2724-23-0x0000000000400000-0x0000000000446000-memory.dmp

    Filesize

    280KB

  • memory/3020-33-0x0000000000400000-0x0000000000541000-memory.dmp

    Filesize

    1.3MB

  • memory/3020-51-0x0000000000400000-0x0000000000541000-memory.dmp

    Filesize

    1.3MB

  • memory/3268-104-0x00007FFDCC1C0000-0x00007FFDCC60C000-memory.dmp

    Filesize

    4.3MB

  • memory/3320-123-0x00007FFDCC1C0000-0x00007FFDCC60C000-memory.dmp

    Filesize

    4.3MB

  • memory/4264-25-0x0000000000400000-0x0000000000541000-memory.dmp

    Filesize

    1.3MB

  • memory/4264-7-0x0000000000400000-0x0000000000541000-memory.dmp

    Filesize

    1.3MB

  • memory/4288-62-0x000002211EE70000-0x000002211EE92000-memory.dmp

    Filesize

    136KB

  • memory/4448-85-0x000000001D130000-0x000000001D1E2000-memory.dmp

    Filesize

    712KB

  • memory/4448-86-0x00007FFDCC1C0000-0x00007FFDCC60C000-memory.dmp

    Filesize

    4.3MB

  • memory/4448-84-0x000000001D020000-0x000000001D070000-memory.dmp

    Filesize

    320KB

  • memory/4448-83-0x000000001C200000-0x000000001C524000-memory.dmp

    Filesize

    3.1MB