Analysis

  • max time kernel
    148s
  • max time network
    152s
  • platform
    windows10_x64
  • resource
    win10-en-20210920
  • submitted
    19/10/2021, 02:49

General

  • Target

    66e8a14e6da21c74e44afd4ec991f7545c8d256490e3abc9fa4a982ba3ed3c4c.exe

  • Size

    832KB

  • MD5

    55ecab29639d0374ead2ddfdb6c0ee74

  • SHA1

    04d18d6e21ee46a3d25fc0d8c99af7719de106c5

  • SHA256

    66e8a14e6da21c74e44afd4ec991f7545c8d256490e3abc9fa4a982ba3ed3c4c

  • SHA512

    639addccae1ca291625368581c16dfba6918ca1e8922ba59bb1721eef1cb0b29e06fb36e25e10ef2c58d372d30c3620a5eb9da56760d9a35831a0074f9416ff1

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

Office04

C2

grace.adds-only.xyz:1609

Mutex

VNM_MUTEX_c2q7y2ayYutZ2XaYe7

Attributes
  • encryption_key

    wHq4o3k6UfKZv19jkcxs

  • install_name

    winrara.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Venom Client Startup

  • subdirectory

    SubDir

Signatures

  • Contains code to disable Windows Defender 6 IoCs

    A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

  • Modifies Windows Defender Real-time Protection settings 3 TTPs
  • Quasar Payload 6 IoCs
  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • VenomRAT

    VenomRAT is a modified version of QuasarRAT with some added features, such as rootkit and stealer capabilites.

  • Executes dropped EXE 3 IoCs
  • Windows security modification 2 TTPs 2 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Suspicious use of SetThreadContext 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 3 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 28 IoCs
  • Suspicious use of AdjustPrivilegeToken 11 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\66e8a14e6da21c74e44afd4ec991f7545c8d256490e3abc9fa4a982ba3ed3c4c.exe
    "C:\Users\Admin\AppData\Local\Temp\66e8a14e6da21c74e44afd4ec991f7545c8d256490e3abc9fa4a982ba3ed3c4c.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2116
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\66e8a14e6da21c74e44afd4ec991f7545c8d256490e3abc9fa4a982ba3ed3c4c.exe"
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:3548
    • C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\uCRAxO" /XML "C:\Users\Admin\AppData\Local\Temp\tmp34F6.tmp"
      2⤵
      • Creates scheduled task(s)
      PID:612
    • C:\Users\Admin\AppData\Local\Temp\66e8a14e6da21c74e44afd4ec991f7545c8d256490e3abc9fa4a982ba3ed3c4c.exe
      "C:\Users\Admin\AppData\Local\Temp\66e8a14e6da21c74e44afd4ec991f7545c8d256490e3abc9fa4a982ba3ed3c4c.exe"
      2⤵
      • Windows security modification
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:436
      • C:\Users\Admin\AppData\Roaming\SubDir\winrara.exe
        "C:\Users\Admin\AppData\Roaming\SubDir\winrara.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3360
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\SubDir\winrara.exe"
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:3532
        • C:\Windows\SysWOW64\schtasks.exe
          "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\uCRAxO" /XML "C:\Users\Admin\AppData\Local\Temp\tmpBC66.tmp"
          4⤵
          • Creates scheduled task(s)
          PID:1092
        • C:\Users\Admin\AppData\Roaming\SubDir\winrara.exe
          "C:\Users\Admin\AppData\Roaming\SubDir\winrara.exe"
          4⤵
          • Executes dropped EXE
          PID:2496
        • C:\Users\Admin\AppData\Roaming\SubDir\winrara.exe
          "C:\Users\Admin\AppData\Roaming\SubDir\winrara.exe"
          4⤵
          • Executes dropped EXE
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of SetWindowsHookEx
          PID:1820
      • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        "powershell" Get-MpPreference -verbose
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:2292
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /k start /b del /q/f/s %TEMP%\* & exit
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1784
        • C:\Windows\SysWOW64\cmd.exe
          C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
          4⤵
            PID:1908
        • C:\Windows\SysWOW64\cmd.exe
          C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\55iL8unUfPt1.bat" "
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:1460
          • C:\Windows\SysWOW64\chcp.com
            chcp 65001
            4⤵
              PID:904
            • C:\Windows\SysWOW64\PING.EXE
              ping -n 10 localhost
              4⤵
              • Runs ping.exe
              PID:3052
            • C:\Users\Admin\AppData\Local\Temp\66e8a14e6da21c74e44afd4ec991f7545c8d256490e3abc9fa4a982ba3ed3c4c.exe
              "C:\Users\Admin\AppData\Local\Temp\66e8a14e6da21c74e44afd4ec991f7545c8d256490e3abc9fa4a982ba3ed3c4c.exe"
              4⤵
              • Suspicious use of SetThreadContext
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of AdjustPrivilegeToken
              • Suspicious use of WriteProcessMemory
              PID:3916
              • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
                "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\66e8a14e6da21c74e44afd4ec991f7545c8d256490e3abc9fa4a982ba3ed3c4c.exe"
                5⤵
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:3572
              • C:\Windows\SysWOW64\schtasks.exe
                "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\uCRAxO" /XML "C:\Users\Admin\AppData\Local\Temp\tmp9EF6.tmp"
                5⤵
                • Creates scheduled task(s)
                PID:756
              • C:\Users\Admin\AppData\Local\Temp\66e8a14e6da21c74e44afd4ec991f7545c8d256490e3abc9fa4a982ba3ed3c4c.exe
                "C:\Users\Admin\AppData\Local\Temp\66e8a14e6da21c74e44afd4ec991f7545c8d256490e3abc9fa4a982ba3ed3c4c.exe"
                5⤵
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:2044

      Network

      MITRE ATT&CK Enterprise v6

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • memory/436-126-0x0000000000400000-0x000000000048C000-memory.dmp

        Filesize

        560KB

      • memory/436-150-0x00000000061B0000-0x00000000061B1000-memory.dmp

        Filesize

        4KB

      • memory/436-149-0x0000000005C80000-0x0000000005C81000-memory.dmp

        Filesize

        4KB

      • memory/436-140-0x0000000004E80000-0x000000000537E000-memory.dmp

        Filesize

        5.0MB

      • memory/1820-665-0x00000000053C0000-0x00000000058BE000-memory.dmp

        Filesize

        5.0MB

      • memory/2044-943-0x0000000004FF0000-0x0000000004FF1000-memory.dmp

        Filesize

        4KB

      • memory/2116-122-0x000000000D620000-0x000000000D621000-memory.dmp

        Filesize

        4KB

      • memory/2116-117-0x0000000007B80000-0x0000000007B81000-memory.dmp

        Filesize

        4KB

      • memory/2116-123-0x000000000D820000-0x000000000D8C7000-memory.dmp

        Filesize

        668KB

      • memory/2116-115-0x00000000008D0000-0x00000000008D1000-memory.dmp

        Filesize

        4KB

      • memory/2116-118-0x0000000007720000-0x0000000007721000-memory.dmp

        Filesize

        4KB

      • memory/2116-121-0x0000000007AE0000-0x0000000007AE8000-memory.dmp

        Filesize

        32KB

      • memory/2116-120-0x0000000007680000-0x0000000007B7E000-memory.dmp

        Filesize

        5.0MB

      • memory/2116-119-0x00000000076C0000-0x00000000076C1000-memory.dmp

        Filesize

        4KB

      • memory/2292-157-0x0000000002D30000-0x0000000002D31000-memory.dmp

        Filesize

        4KB

      • memory/2292-296-0x000000007F110000-0x000000007F111000-memory.dmp

        Filesize

        4KB

      • memory/2292-298-0x0000000004673000-0x0000000004674000-memory.dmp

        Filesize

        4KB

      • memory/2292-187-0x0000000004670000-0x0000000004671000-memory.dmp

        Filesize

        4KB

      • memory/2292-159-0x0000000002D30000-0x0000000002D31000-memory.dmp

        Filesize

        4KB

      • memory/2292-191-0x0000000004672000-0x0000000004673000-memory.dmp

        Filesize

        4KB

      • memory/3360-192-0x0000000007D90000-0x000000000828E000-memory.dmp

        Filesize

        5.0MB

      • memory/3532-661-0x0000000006F80000-0x0000000006F81000-memory.dmp

        Filesize

        4KB

      • memory/3532-768-0x0000000006F83000-0x0000000006F84000-memory.dmp

        Filesize

        4KB

      • memory/3532-664-0x0000000006F82000-0x0000000006F83000-memory.dmp

        Filesize

        4KB

      • memory/3532-697-0x000000007EED0000-0x000000007EED1000-memory.dmp

        Filesize

        4KB

      • memory/3548-139-0x00000000040E2000-0x00000000040E3000-memory.dmp

        Filesize

        4KB

      • memory/3548-141-0x0000000006CB0000-0x0000000006CB1000-memory.dmp

        Filesize

        4KB

      • memory/3548-193-0x0000000008E80000-0x0000000008E81000-memory.dmp

        Filesize

        4KB

      • memory/3548-189-0x00000000040E3000-0x00000000040E4000-memory.dmp

        Filesize

        4KB

      • memory/3548-186-0x0000000008CA0000-0x0000000008CA1000-memory.dmp

        Filesize

        4KB

      • memory/3548-180-0x0000000008940000-0x0000000008941000-memory.dmp

        Filesize

        4KB

      • memory/3548-169-0x0000000008960000-0x0000000008993000-memory.dmp

        Filesize

        204KB

      • memory/3548-147-0x0000000002680000-0x0000000002681000-memory.dmp

        Filesize

        4KB

      • memory/3548-145-0x0000000007BB0000-0x0000000007BB1000-memory.dmp

        Filesize

        4KB

      • memory/3548-144-0x0000000007DD0000-0x0000000007DD1000-memory.dmp

        Filesize

        4KB

      • memory/3548-143-0x0000000006DE0000-0x0000000006DE1000-memory.dmp

        Filesize

        4KB

      • memory/3548-142-0x0000000007540000-0x0000000007541000-memory.dmp

        Filesize

        4KB

      • memory/3548-137-0x00000000040E0000-0x00000000040E1000-memory.dmp

        Filesize

        4KB

      • memory/3548-194-0x000000007F230000-0x000000007F231000-memory.dmp

        Filesize

        4KB

      • memory/3548-138-0x0000000006B90000-0x0000000006B91000-memory.dmp

        Filesize

        4KB

      • memory/3548-136-0x0000000006AF0000-0x0000000006AF1000-memory.dmp

        Filesize

        4KB

      • memory/3548-132-0x0000000006E10000-0x0000000006E11000-memory.dmp

        Filesize

        4KB

      • memory/3548-127-0x0000000002680000-0x0000000002681000-memory.dmp

        Filesize

        4KB

      • memory/3548-128-0x0000000002680000-0x0000000002681000-memory.dmp

        Filesize

        4KB

      • memory/3548-130-0x0000000004070000-0x0000000004071000-memory.dmp

        Filesize

        4KB

      • memory/3572-942-0x0000000006F90000-0x0000000006F91000-memory.dmp

        Filesize

        4KB

      • memory/3572-945-0x0000000006F92000-0x0000000006F93000-memory.dmp

        Filesize

        4KB

      • memory/3572-973-0x000000007EF70000-0x000000007EF71000-memory.dmp

        Filesize

        4KB

      • memory/3572-975-0x0000000006F93000-0x0000000006F94000-memory.dmp

        Filesize

        4KB

      • memory/3916-925-0x0000000007A80000-0x0000000007F7E000-memory.dmp

        Filesize

        5.0MB