Analysis

  • max time kernel
    133s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    05/05/2022, 10:47

General

  • Target
    a958bca004dcc7edf8310150ef02512b.exe
  • Size 2.1MB
  • Sample220505-mvhtdaaefm
  • SHA256 a3f1615bd60b684da869e6b08295b273bd7698f63aa24ffb86d2ce24e03496bf
  • MD5 SHA1 SHA512

Malware Config

Signatures

  • DcRat

    DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.

  • Process spawned unexpected child process 21 IoCs

    This typically indicates the parent process was compromised via an exploit or macro.

  • suricata: ET MALWARE DCRAT Activity (GET)

    suricata: ET MALWARE DCRAT Activity (GET)

  • Disables Task Manager via registry modification
  • Executes dropped EXE 3 IoCs
  • Checks computer location settings 2 TTPs 4 IoCs

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

  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Drops file in Program Files directory 3 IoCs
  • Drops file in Windows directory 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 21 IoCs

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

  • Modifies registry class 2 IoCs
  • Modifies registry key 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 18 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 19 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a958bca004dcc7edf8310150ef02512b.exe
    "C:\Users\Admin\AppData\Local\Temp\a958bca004dcc7edf8310150ef02512b.exe"
    1⤵
    • Checks computer location settings
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:1176
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\SessionruntimebrokerCommon\zhIp2XW1emn5KJ.vbe"
      2⤵
      • Checks computer location settings
      • Suspicious use of WriteProcessMemory
      PID:2136
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\SessionruntimebrokerCommon\cEwrYP.bat" "
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1992
        • C:\SessionruntimebrokerCommon\msportBrowser.exe
          "C:\SessionruntimebrokerCommon\msportBrowser.exe"
          4⤵
          • Executes dropped EXE
          • Checks computer location settings
          • Drops file in Program Files directory
          • Drops file in Windows directory
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:4456
          • C:\SessionruntimebrokerCommon\msportBrowser.exe
            "C:\SessionruntimebrokerCommon\msportBrowser.exe"
            5⤵
            • Executes dropped EXE
            • Checks computer location settings
            • Drops file in Windows directory
            • Modifies registry class
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of WriteProcessMemory
            PID:2020
            • C:\Windows\System32\cmd.exe
              "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\AM1acbGJr2.bat"
              6⤵
              • Suspicious use of WriteProcessMemory
              PID:3908
              • C:\Windows\system32\w32tm.exe
                w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
                7⤵
                  PID:1020
                • C:\SessionruntimebrokerCommon\WmiPrvSE.exe
                  "C:\SessionruntimebrokerCommon\WmiPrvSE.exe"
                  7⤵
                  • Executes dropped EXE
                  • Suspicious behavior: EnumeratesProcesses
                  • Suspicious behavior: GetForegroundWindowSpam
                  • Suspicious use of AdjustPrivilegeToken
                  PID:2200
          • C:\Windows\SysWOW64\reg.exe
            reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f
            4⤵
            • Modifies registry key
            PID:4292
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 14 /tr "'C:\Program Files\Windows Portable Devices\RuntimeBroker.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4924
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files\Windows Portable Devices\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1196
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 7 /tr "'C:\Program Files\Windows Portable Devices\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4120
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "servicess" /sc MINUTE /mo 12 /tr "'C:\odt\services.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4928
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\odt\services.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2792
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "servicess" /sc MINUTE /mo 8 /tr "'C:\odt\services.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4908
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 9 /tr "'C:\odt\sihost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1664
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\odt\sihost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4948
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 13 /tr "'C:\odt\sihost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2376
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 8 /tr "'C:\Windows\tracing\sppsvc.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3964
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Windows\tracing\sppsvc.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4016
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 7 /tr "'C:\Windows\tracing\sppsvc.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:956
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\Registry.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4048
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "Registry" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\Registry.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3620
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\Registry.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2900
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 5 /tr "'C:\SessionruntimebrokerCommon\WmiPrvSE.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2280
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\SessionruntimebrokerCommon\WmiPrvSE.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4288
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 11 /tr "'C:\SessionruntimebrokerCommon\WmiPrvSE.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2496
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 6 /tr "'C:\SessionruntimebrokerCommon\OfficeClickToRun.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4984
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\SessionruntimebrokerCommon\OfficeClickToRun.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:5084
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 11 /tr "'C:\SessionruntimebrokerCommon\OfficeClickToRun.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1556

    Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          WmiPrvSE.exe

          • Path C:\SessionruntimebrokerCommon\WmiPrvSE.exe
          • Size 1.7MB
          • SHA256 9da1c8ead1bf1e76bc8ea2267eae81f44c3ce33e6d1e2b8201fbf1af187a17cc
          • MD5 SHA1 SHA512 SSDEEP

          WmiPrvSE.exe

          • Path C:\SessionruntimebrokerCommon\WmiPrvSE.exe
          • Size 1.7MB
          • SHA256 9da1c8ead1bf1e76bc8ea2267eae81f44c3ce33e6d1e2b8201fbf1af187a17cc
          • MD5 SHA1 SHA512 SSDEEP

          cEwrYP.bat

          • Path C:\SessionruntimebrokerCommon\cEwrYP.bat
          • Size 161B
          • SHA256 6c081456763b96a26b21443ea6987ea1b143bb47b17f3a2b6bec9ca27f3931a6
          • MD5 SHA1 SHA512

          msportBrowser.exe

          • Path C:\SessionruntimebrokerCommon\msportBrowser.exe
          • Size 1.7MB
          • SHA256 9da1c8ead1bf1e76bc8ea2267eae81f44c3ce33e6d1e2b8201fbf1af187a17cc
          • MD5 SHA1 SHA512 SSDEEP

          msportBrowser.exe

          • Path C:\SessionruntimebrokerCommon\msportBrowser.exe
          • Size 1.7MB
          • SHA256 9da1c8ead1bf1e76bc8ea2267eae81f44c3ce33e6d1e2b8201fbf1af187a17cc
          • MD5 SHA1 SHA512 SSDEEP

          msportBrowser.exe

          • Path C:\SessionruntimebrokerCommon\msportBrowser.exe
          • Size 1.7MB
          • SHA256 9da1c8ead1bf1e76bc8ea2267eae81f44c3ce33e6d1e2b8201fbf1af187a17cc
          • MD5 SHA1 SHA512 SSDEEP

          zhIp2XW1emn5KJ.vbe

          • Path C:\SessionruntimebrokerCommon\zhIp2XW1emn5KJ.vbe
          • Size 206B
          • SHA256 7c02f23c879d3b2073f68ea42946d7a604ffeabd4cf71b7d7f66c8b71aa99663
          • MD5 SHA1 SHA512

          msportBrowser.exe.log

          • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\msportBrowser.exe.log
          • Size 1KB
          • SHA256 eb70c64ae99d14ac2588b7a84854fbf3c420532d7fe4dfd49c7b5a70c869943a
          • MD5 SHA1 SHA512

          AM1acbGJr2.bat

          • Path C:\Users\Admin\AppData\Local\Temp\AM1acbGJr2.bat
          • Size 207B
          • SHA256 11b58be1d2e5b4ec8c51a1d5a0a353ed0df2098052f0154764a7ac006e7b2eb0
          • MD5 SHA1 SHA512

          memory/2020-145-0x00007FF8643B0000-0x00007FF864E71000-memory.dmp

          memory/2200-152-0x00007FF864290000-0x00007FF864D51000-memory.dmp

          memory/4456-140-0x000000001DD00000-0x000000001E228000-memory.dmp

          memory/4456-139-0x00000000012C0000-0x0000000001310000-memory.dmp

          memory/4456-138-0x00007FF8643B0000-0x00007FF864E71000-memory.dmp

          memory/4456-137-0x0000000000880000-0x0000000000A42000-memory.dmp