Analysis

  • max time kernel
    12s
  • max time network
    157s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    31/03/2023, 09:56

General

  • Target
    a0a6e25c9983c73293aa7c9aabb893d5.exe
  • Size 3.3MB
  • Sample230331-lycabshc29
  • SHA256 5250a7d14874c55bebe18f783f9534fae7a79174fdd93efa5a96e079dcaefe83
  • MD5 SHA1 SHA512 SSDEEP

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 30 IoCs

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

  • UAC bypass 3 TTPs 3 IoCs
  • DCRat payload 4 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Checks whether UAC is enabled 1 TTPs 2 IoCs
  • Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs
  • Drops file in Program Files directory 4 IoCs
  • Drops file in Windows directory 2 IoCs
  • Creates scheduled task(s) 1 TTPs 30 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 13 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • System policy modification 1 TTPs 3 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Users\Admin\AppData\Local\Temp\a0a6e25c9983c73293aa7c9aabb893d5.exe
    "C:\Users\Admin\AppData\Local\Temp\a0a6e25c9983c73293aa7c9aabb893d5.exe"
    1⤵
    • UAC bypass
    • Checks whether UAC is enabled
    • Suspicious use of NtSetInformationThreadHideFromDebugger
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of SetWindowsHookEx
    • System policy modification
    PID:4480
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\PcwjyylHJ0.bat"
      2⤵
        PID:3356
        • C:\Windows\SysWOW64\w32tm.exe
          w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
          3⤵
            PID:3376
            • C:\Windows\system32\w32tm.exe
              w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
              4⤵
                PID:2868
            • C:\Program Files\Windows Multimedia Platform\explorer.exe
              "C:\Program Files\Windows Multimedia Platform\explorer.exe"
              3⤵
                PID:4476
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 10 /tr "'C:\odt\System.exe'" /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:1052
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\odt\System.exe'" /rl HIGHEST /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:1372
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 7 /tr "'C:\odt\System.exe'" /rl HIGHEST /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:1424
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 8 /tr "'C:\odt\OfficeClickToRun.exe'" /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:2328
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\odt\OfficeClickToRun.exe'" /rl HIGHEST /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:3360
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 6 /tr "'C:\odt\OfficeClickToRun.exe'" /rl HIGHEST /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:4712
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "explorere" /sc MINUTE /mo 5 /tr "'C:\Recovery\WindowsRE\explorer.exe'" /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:4032
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\explorer.exe'" /rl HIGHEST /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:5052
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "explorere" /sc MINUTE /mo 7 /tr "'C:\Recovery\WindowsRE\explorer.exe'" /rl HIGHEST /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:2244
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 7 /tr "'C:\Users\Default User\csrss.exe'" /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:3700
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Users\Default User\csrss.exe'" /rl HIGHEST /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:4772
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 7 /tr "'C:\Users\Default User\csrss.exe'" /rl HIGHEST /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:396
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 6 /tr "'C:\Program Files\Microsoft Office 15\ClientX64\RuntimeBroker.exe'" /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:2480
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files\Microsoft Office 15\ClientX64\RuntimeBroker.exe'" /rl HIGHEST /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:664
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 11 /tr "'C:\Program Files\Microsoft Office 15\ClientX64\RuntimeBroker.exe'" /rl HIGHEST /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:1664
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "explorere" /sc MINUTE /mo 8 /tr "'C:\Program Files\Windows Multimedia Platform\explorer.exe'" /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:3076
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Program Files\Windows Multimedia Platform\explorer.exe'" /rl HIGHEST /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:2712
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "explorere" /sc MINUTE /mo 8 /tr "'C:\Program Files\Windows Multimedia Platform\explorer.exe'" /rl HIGHEST /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:976
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\WmiPrvSE.exe'" /rl HIGHEST /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:3492
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\WmiPrvSE.exe'" /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:2324
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 8 /tr "'C:\Recovery\WindowsRE\WmiPrvSE.exe'" /rl HIGHEST /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:3956
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "StartMenuExperienceHostS" /sc MINUTE /mo 5 /tr "'C:\Windows\Cursors\StartMenuExperienceHost.exe'" /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:4488
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "StartMenuExperienceHost" /sc ONLOGON /tr "'C:\Windows\Cursors\StartMenuExperienceHost.exe'" /rl HIGHEST /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:5080
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "StartMenuExperienceHostS" /sc MINUTE /mo 13 /tr "'C:\Windows\Cursors\StartMenuExperienceHost.exe'" /rl HIGHEST /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:1432
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 10 /tr "'C:\odt\backgroundTaskHost.exe'" /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:4976
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\odt\backgroundTaskHost.exe'" /rl HIGHEST /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:792
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 9 /tr "'C:\odt\backgroundTaskHost.exe'" /rl HIGHEST /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:5100
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 14 /tr "'C:\Users\All Users\Package Cache\{33d1fd90-4274-48a1-9bc1-97e33d9c2d6f}\RuntimeBroker.exe'" /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:4728
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Users\All Users\Package Cache\{33d1fd90-4274-48a1-9bc1-97e33d9c2d6f}\RuntimeBroker.exe'" /rl HIGHEST /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:2484
          • C:\Windows\system32\schtasks.exe
            schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 5 /tr "'C:\Users\All Users\Package Cache\{33d1fd90-4274-48a1-9bc1-97e33d9c2d6f}\RuntimeBroker.exe'" /rl HIGHEST /f
            1⤵
            • Process spawned unexpected child process
            • Creates scheduled task(s)
            PID:2748

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

                Loading Replay Monitor...

                Downloads

                RuntimeBroker.exe

                • Path C:\Program Files\Microsoft Office 15\ClientX64\RuntimeBroker.exe
                • Size 3.3MB
                • SHA256 5250a7d14874c55bebe18f783f9534fae7a79174fdd93efa5a96e079dcaefe83
                • MD5 SHA1 SHA512 SSDEEP

                explorer.exe

                • Path C:\Program Files\Windows Multimedia Platform\explorer.exe
                • Size 3.3MB
                • SHA256 5250a7d14874c55bebe18f783f9534fae7a79174fdd93efa5a96e079dcaefe83
                • MD5 SHA1 SHA512 SSDEEP

                explorer.exe

                • Path C:\Program Files\Windows Multimedia Platform\explorer.exe
                • Size 3.3MB
                • SHA256 5250a7d14874c55bebe18f783f9534fae7a79174fdd93efa5a96e079dcaefe83
                • MD5 SHA1 SHA512 SSDEEP

                PcwjyylHJ0.bat

                • Path C:\Users\Admin\AppData\Local\Temp\PcwjyylHJ0.bat
                • Size 222B
                • SHA256 785ae15420233020d96a4ac314507150597a7cba59d9e85395493e597231d1b9
                • MD5 SHA1 SHA512

                memory/4476-174-0x00000000008D0000-0x0000000000EB6000-memory.dmp

                memory/4476-175-0x00000000008D0000-0x0000000000EB6000-memory.dmp

                memory/4476-179-0x00000000038A0000-0x00000000038B0000-memory.dmp

                memory/4476-178-0x00000000008D0000-0x0000000000EB6000-memory.dmp

                memory/4476-176-0x00000000038A0000-0x00000000038B0000-memory.dmp

                memory/4480-169-0x0000000000270000-0x0000000000856000-memory.dmp

                memory/4480-137-0x00000000063A0000-0x00000000063F0000-memory.dmp

                memory/4480-138-0x0000000006BD0000-0x0000000006C62000-memory.dmp

                memory/4480-133-0x0000000000270000-0x0000000000856000-memory.dmp

                memory/4480-136-0x0000000003610000-0x0000000003620000-memory.dmp

                memory/4480-165-0x0000000000270000-0x0000000000856000-memory.dmp

                memory/4480-135-0x0000000006540000-0x0000000006AE4000-memory.dmp

                memory/4480-134-0x0000000000270000-0x0000000000856000-memory.dmp

                memory/4480-142-0x0000000007FE0000-0x0000000008046000-memory.dmp

                memory/4480-139-0x00000000084A0000-0x00000000089CC000-memory.dmp