Analysis

  • max time kernel
    84s
  • max time network
    171s
  • platform
    windows7_x64
  • resource
    win7-20220414-en
  • submitted
    17/05/2022, 15:40

General

  • Target
    05172022.scr.exe
  • Size 1.8MB
  • Sample220517-s3715aebc2
  • SHA256 bf135724716fdb8f935249e97e33949db73caa02b89e7044fc273f4ae630b2d4
  • 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)

  • Downloads MZ/PE file
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 2 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Drops file in Program Files directory 8 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.

  • Suspicious behavior: EnumeratesProcesses 14 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 25 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\05172022.scr.exe
    "C:\Users\Admin\AppData\Local\Temp\05172022.scr.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1648
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\componentWebfont\xLuqGiroaa7BzMlNIfHTLkz.vbe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2000
      • C:\Windows\SysWOW64\cmd.exe
        cmd /c ""C:\componentWebfont\IqjWTYaG8BaLm8.bat" "
        3⤵
        • Loads dropped DLL
        • Suspicious use of WriteProcessMemory
        PID:1616
        • C:\componentWebfont\Fontreviewnet.exe
          "C:\componentWebfont\Fontreviewnet.exe"
          4⤵
          • Executes dropped EXE
          • Drops file in Program Files directory
          • Drops file in Windows directory
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:1240
          • C:\Windows\System32\cmd.exe
            "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\lQ8ANZYlqW.bat"
            5⤵
            • Suspicious use of WriteProcessMemory
            PID:988
            • C:\Windows\system32\w32tm.exe
              w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
              6⤵
                PID:1668
              • C:\Windows\IME\smss.exe
                "C:\Windows\IME\smss.exe"
                6⤵
                • Executes dropped EXE
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:1748
      • C:\Windows\SysWOW64\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\componentWebfont\file.vbs"
        2⤵
          PID:2008
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 6 /tr "'C:\Recovery\4e1be222-bc70-11ec-afb1-f2122c6314cc\conhost.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1924
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "conhost" /sc ONLOGON /tr "'C:\Recovery\4e1be222-bc70-11ec-afb1-f2122c6314cc\conhost.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1384
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 14 /tr "'C:\Recovery\4e1be222-bc70-11ec-afb1-f2122c6314cc\conhost.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1716
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 9 /tr "'C:\Program Files\Windows Portable Devices\System.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:564
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Program Files\Windows Portable Devices\System.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1560
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 13 /tr "'C:\Program Files\Windows Portable Devices\System.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1784
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 13 /tr "'C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\csrss.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:600
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\csrss.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:984
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 14 /tr "'C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\csrss.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1100
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 7 /tr "'C:\Program Files\Windows Media Player\sppsvc.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1108
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Program Files\Windows Media Player\sppsvc.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1008
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 6 /tr "'C:\Program Files\Windows Media Player\sppsvc.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:2012
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 10 /tr "'C:\Recovery\4e1be222-bc70-11ec-afb1-f2122c6314cc\sppsvc.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1152
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Recovery\4e1be222-bc70-11ec-afb1-f2122c6314cc\sppsvc.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1632
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 10 /tr "'C:\Recovery\4e1be222-bc70-11ec-afb1-f2122c6314cc\sppsvc.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1640
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "smsss" /sc MINUTE /mo 14 /tr "'C:\Windows\IME\smss.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1120
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Windows\IME\smss.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1976
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "smsss" /sc MINUTE /mo 10 /tr "'C:\Windows\IME\smss.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:584
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\Windows NT\lsass.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:908
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows NT\lsass.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1572
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Windows NT\lsass.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1340

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            lQ8ANZYlqW.bat

            • Path C:\Users\Admin\AppData\Local\Temp\lQ8ANZYlqW.bat
            • Size 188B
            • SHA256 8abd1072b136bf172009dea76dfe5c92b1ff110bd10165eb0272e4d5c8fc4545
            • MD5 SHA1 SHA512

            smss.exe

            • Path C:\Windows\IME\smss.exe
            • Size 1.5MB
            • SHA256 1f9b28083379d3ccc094f431b4d866717f29ca6be3d400c42ab359033db4e9c0
            • MD5 SHA1 SHA512 SSDEEP

            smss.exe

            • Path C:\Windows\IME\smss.exe
            • Size 1.5MB
            • SHA256 1f9b28083379d3ccc094f431b4d866717f29ca6be3d400c42ab359033db4e9c0
            • MD5 SHA1 SHA512 SSDEEP

            Fontreviewnet.exe

            • Path C:\componentWebfont\Fontreviewnet.exe
            • Size 1.5MB
            • SHA256 1f9b28083379d3ccc094f431b4d866717f29ca6be3d400c42ab359033db4e9c0
            • MD5 SHA1 SHA512 SSDEEP

            Fontreviewnet.exe

            • Path C:\componentWebfont\Fontreviewnet.exe
            • Size 1.5MB
            • SHA256 1f9b28083379d3ccc094f431b4d866717f29ca6be3d400c42ab359033db4e9c0
            • MD5 SHA1 SHA512 SSDEEP

            IqjWTYaG8BaLm8.bat

            • Path C:\componentWebfont\IqjWTYaG8BaLm8.bat
            • Size 39B
            • SHA256 20339cff524d4ac8c86c5f6e74a6a9b67e273160f5007641ce03b723be40c908
            • MD5 SHA1 SHA512

            file.vbs

            • Path C:\componentWebfont\file.vbs
            • Size 34B
            • SHA256 f1cccb5ae4aa51d293bd3c7d2a1a04cb7847d22c5db8e05ac64e9a6d7455aa0b
            • MD5 SHA1 SHA512

            xLuqGiroaa7BzMlNIfHTLkz.vbe

            • Path C:\componentWebfont\xLuqGiroaa7BzMlNIfHTLkz.vbe
            • Size 207B
            • SHA256 066bf7d19d36c6ff895c799f606c37b38bd42ba68483c83c4fac57708d06d3a2
            • MD5 SHA1 SHA512

            Fontreviewnet.exe

            • Path \componentWebfont\Fontreviewnet.exe
            • Size 1.5MB
            • SHA256 1f9b28083379d3ccc094f431b4d866717f29ca6be3d400c42ab359033db4e9c0
            • MD5 SHA1 SHA512 SSDEEP

            Fontreviewnet.exe

            • Path \componentWebfont\Fontreviewnet.exe
            • Size 1.5MB
            • SHA256 1f9b28083379d3ccc094f431b4d866717f29ca6be3d400c42ab359033db4e9c0
            • MD5 SHA1 SHA512 SSDEEP

            memory/1240-75-0x0000000000F70000-0x0000000000F7E000-memory.dmp

            memory/1240-69-0x0000000000C90000-0x0000000000CAC000-memory.dmp

            memory/1240-76-0x0000000000F80000-0x0000000000F88000-memory.dmp

            memory/1240-71-0x0000000000C00000-0x0000000000C12000-memory.dmp

            memory/1240-72-0x0000000000E40000-0x0000000000E50000-memory.dmp

            memory/1240-73-0x0000000000E20000-0x0000000000E2C000-memory.dmp

            memory/1240-74-0x0000000000E30000-0x0000000000E42000-memory.dmp

            memory/1240-68-0x0000000001020000-0x000000000119E000-memory.dmp

            memory/1240-70-0x00000000006E0000-0x00000000006F0000-memory.dmp

            memory/1648-54-0x0000000075F61000-0x0000000075F63000-memory.dmp

            memory/1748-83-0x0000000001180000-0x00000000012FE000-memory.dmp

            memory/1748-84-0x0000000000660000-0x0000000000672000-memory.dmp

            memory/1748-85-0x0000000000680000-0x0000000000692000-memory.dmp