Analysis

  • max time kernel
    141s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    27/10/2022, 09:26

General

  • Target
    6D4AC58DA19A639E21EBA4F4AEBF1C4B61C1DE2877EB3.exe
  • Size 1.4MB
  • Sample221027-ld69zabff7
  • SHA256 6d4ac58da19a639e21eba4f4aebf1c4b61c1de2877eb3c5e8044fed7cd79a068
  • 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 36 IoCs

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

  • DCRat payload 3 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Executes dropped EXE 2 IoCs
  • Checks computer location settings 2 TTPs 1 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.

  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Suspicious use of SetThreadContext 2 IoCs
  • Drops file in Program Files directory 8 IoCs
  • Drops file in Windows directory 4 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 36 IoCs

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

  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 24 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\6D4AC58DA19A639E21EBA4F4AEBF1C4B61C1DE2877EB3.exe
    "C:\Users\Admin\AppData\Local\Temp\6D4AC58DA19A639E21EBA4F4AEBF1C4B61C1DE2877EB3.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:2576
    • C:\Users\Admin\AppData\Local\Temp\6D4AC58DA19A639E21EBA4F4AEBF1C4B61C1DE2877EB3.exe
      C:\Users\Admin\AppData\Local\Temp\6D4AC58DA19A639E21EBA4F4AEBF1C4B61C1DE2877EB3.exe
      2⤵
        PID:4840
      • C:\Users\Admin\AppData\Local\Temp\6D4AC58DA19A639E21EBA4F4AEBF1C4B61C1DE2877EB3.exe
        C:\Users\Admin\AppData\Local\Temp\6D4AC58DA19A639E21EBA4F4AEBF1C4B61C1DE2877EB3.exe
        2⤵
        • Checks computer location settings
        • Drops file in Program Files directory
        • Drops file in Windows directory
        • Modifies registry class
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2776
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\Ckg6GRmN5r.bat"
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:1068
          • C:\Windows\SysWOW64\w32tm.exe
            w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
            4⤵
            • Suspicious use of WriteProcessMemory
            PID:1928
            • C:\Windows\system32\w32tm.exe
              w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
              5⤵
                PID:2448
            • C:\Windows\Offline Web Pages\backgroundTaskHost.exe
              "C:\Windows\Offline Web Pages\backgroundTaskHost.exe"
              4⤵
              • Executes dropped EXE
              • Suspicious use of SetThreadContext
              • Suspicious use of WriteProcessMemory
              PID:4212
              • C:\Windows\Offline Web Pages\backgroundTaskHost.exe
                "C:\Windows\Offline Web Pages\backgroundTaskHost.exe"
                5⤵
                • Executes dropped EXE
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious behavior: GetForegroundWindowSpam
                • Suspicious use of AdjustPrivilegeToken
                PID:1260
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 11 /tr "'C:\odt\dllhost.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:2204
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\odt\dllhost.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1856
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 5 /tr "'C:\odt\dllhost.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 "RuntimeBrokerR" /sc MINUTE /mo 9 /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\RuntimeBroker.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:4648
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\RuntimeBroker.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:3920
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\RuntimeBroker.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:3944
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Windows NT\TableTextService\en-US\winlogon.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:3956
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows NT\TableTextService\en-US\winlogon.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:3676
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Windows NT\TableTextService\en-US\winlogon.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:3748
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "servicess" /sc MINUTE /mo 13 /tr "'C:\Program Files\Windows Portable Devices\services.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:2600
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Program Files\Windows Portable Devices\services.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:2480
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "servicess" /sc MINUTE /mo 6 /tr "'C:\Program Files\Windows Portable Devices\services.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:4348
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 8 /tr "'C:\Windows\Offline Web Pages\backgroundTaskHost.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:3900
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Windows\Offline Web Pages\backgroundTaskHost.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:4460
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 9 /tr "'C:\Windows\Offline Web Pages\backgroundTaskHost.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1244
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 7 /tr "'C:\Program Files (x86)\Windows Multimedia Platform\Registry.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:3836
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "Registry" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Multimedia Platform\Registry.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:4664
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Windows Multimedia Platform\Registry.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:3052
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "6D4AC58DA19A639E21EBA4F4AEBF1C4B61C1DE2877EB36" /sc MINUTE /mo 13 /tr "'C:\Users\Public\6D4AC58DA19A639E21EBA4F4AEBF1C4B61C1DE2877EB3.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:3560
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "6D4AC58DA19A639E21EBA4F4AEBF1C4B61C1DE2877EB3" /sc ONLOGON /tr "'C:\Users\Public\6D4AC58DA19A639E21EBA4F4AEBF1C4B61C1DE2877EB3.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1136
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "6D4AC58DA19A639E21EBA4F4AEBF1C4B61C1DE2877EB36" /sc MINUTE /mo 12 /tr "'C:\Users\Public\6D4AC58DA19A639E21EBA4F4AEBF1C4B61C1DE2877EB3.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 "conhostc" /sc MINUTE /mo 10 /tr "'C:\Users\Admin\AppData\Local\Application Data\conhost.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1248
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "conhost" /sc ONLOGON /tr "'C:\Users\Admin\AppData\Local\Application Data\conhost.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:844
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 9 /tr "'C:\Users\Admin\AppData\Local\Application Data\conhost.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:660
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 10 /tr "'C:\Recovery\WindowsRE\Idle.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1640
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\Idle.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:2992
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 5 /tr "'C:\Recovery\WindowsRE\Idle.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:4472
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 9 /tr "'C:\Windows\Media\Garden\RuntimeBroker.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:2184
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\Media\Garden\RuntimeBroker.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:2492
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 10 /tr "'C:\Windows\Media\Garden\RuntimeBroker.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:4676
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "explorere" /sc MINUTE /mo 7 /tr "'C:\odt\explorer.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:2244
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\odt\explorer.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1600
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "explorere" /sc MINUTE /mo 10 /tr "'C:\odt\explorer.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:2968
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "upfcu" /sc MINUTE /mo 12 /tr "'C:\Users\Admin\Application Data\upfc.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1060
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "upfc" /sc ONLOGON /tr "'C:\Users\Admin\Application Data\upfc.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1892
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "upfcu" /sc MINUTE /mo 8 /tr "'C:\Users\Admin\Application Data\upfc.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:3132

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            6D4AC58DA19A639E21EBA4F4AEBF1C4B61C1DE2877EB3.exe.log

            • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\6D4AC58DA19A639E21EBA4F4AEBF1C4B61C1DE2877EB3.exe.log
            • Size 789B
            • SHA256 745ab70552d9a0463b791fd8dc1942838ac3e34fb1a68f09ed3766c7e3b05631
            • MD5 SHA1 SHA512

            backgroundTaskHost.exe.log

            • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\backgroundTaskHost.exe.log
            • Size 789B
            • SHA256 745ab70552d9a0463b791fd8dc1942838ac3e34fb1a68f09ed3766c7e3b05631
            • MD5 SHA1 SHA512

            Ckg6GRmN5r.bat

            • Path C:\Users\Admin\AppData\Local\Temp\Ckg6GRmN5r.bat
            • Size 216B
            • SHA256 1e2fdd690a2b4fc6e34bf7a1403269bfb0828d3fcab757a5fc37cdd460fb25f0
            • MD5 SHA1 SHA512

            backgroundTaskHost.exe

            • Path C:\Windows\Offline Web Pages\backgroundTaskHost.exe
            • Size 1.4MB
            • SHA256 6d4ac58da19a639e21eba4f4aebf1c4b61c1de2877eb3c5e8044fed7cd79a068
            • MD5 SHA1 SHA512 SSDEEP

            backgroundTaskHost.exe

            • Path C:\Windows\Offline Web Pages\backgroundTaskHost.exe
            • Size 1.4MB
            • SHA256 6d4ac58da19a639e21eba4f4aebf1c4b61c1de2877eb3c5e8044fed7cd79a068
            • MD5 SHA1 SHA512 SSDEEP

            backgroundTaskHost.exe

            • Path C:\Windows\Offline Web Pages\backgroundTaskHost.exe
            • Size 1.4MB
            • SHA256 6d4ac58da19a639e21eba4f4aebf1c4b61c1de2877eb3c5e8044fed7cd79a068
            • MD5 SHA1 SHA512 SSDEEP

            memory/2576-132-0x00000000004C0000-0x000000000062A000-memory.dmp

            memory/2576-136-0x00000000077D0000-0x00000000077EE000-memory.dmp

            memory/2576-135-0x0000000007AB0000-0x0000000007B26000-memory.dmp

            memory/2576-134-0x0000000007810000-0x00000000078A2000-memory.dmp

            memory/2576-133-0x0000000007D20000-0x00000000082C4000-memory.dmp

            memory/2776-138-0x0000000000400000-0x00000000004F8000-memory.dmp

            memory/2776-139-0x0000000005A70000-0x0000000005AC0000-memory.dmp

            memory/2776-141-0x0000000007580000-0x00000000075E6000-memory.dmp

            memory/2776-140-0x00000000079B0000-0x0000000007EDC000-memory.dmp