Resubmissions

12/01/2023, 20:01

230112-yrh6hsae5210

07/01/2023, 04:41

230107-fa3jqagb8t10

07/01/2023, 04:21

230107-eynj2acf8710

Analysis

  • max time kernel
    60s
  • max time network
    62s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    07/01/2023, 04:41

General

  • Target
    0a0a64f3c4fa7d960be983aa0a7d0ce8.exe
  • Size 3.8MB
  • Sample230107-fa3jqagb8t
  • SHA256 6d95012691b58c36574d4b1061b07e0a8340909664908e991fad91028777fdd1
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • DcRat 10 IoCs

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

  • Modifies WinLogon for persistence 2 TTPs 3 IoCs
  • Process spawned unexpected child process 9 IoCs

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

  • UAC bypass 3 TTPs 6 IoCs
  • DCRat payload 4 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Executes dropped EXE 1 IoCs
  • Adds Run key to start application 2 TTPs 6 IoCs
  • Checks whether UAC is enabled 1 TTPs 4 IoCs
  • Looks up external IP address via web service 2 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Creates scheduled task(s) 1 TTPs 9 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 13 IoCs
  • Suspicious use of AdjustPrivilegeToken 8 IoCs
  • Suspicious use of WriteProcessMemory 21 IoCs
  • System policy modification 1 TTPs 6 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\0a0a64f3c4fa7d960be983aa0a7d0ce8.exe
    "C:\Users\Admin\AppData\Local\Temp\0a0a64f3c4fa7d960be983aa0a7d0ce8.exe"
    1⤵
    • DcRat
    • Modifies WinLogon for persistence
    • UAC bypass
    • Adds Run key to start application
    • Checks whether UAC is enabled
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:1016
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\0a0a64f3c4fa7d960be983aa0a7d0ce8.exe'
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2000
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\All Users\Favorites\lsass.exe'
      2⤵
        PID:788
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Recovery\c0f67622-1a8a-11ed-ae9f-b21da26d38ed\smss.exe'
        2⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1608
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Recovery\c0f67622-1a8a-11ed-ae9f-b21da26d38ed\sppsvc.exe'
        2⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:904
      • C:\Users\All Users\Favorites\lsass.exe
        "C:\Users\All Users\Favorites\lsass.exe"
        2⤵
        • UAC bypass
        • Executes dropped EXE
        • Checks whether UAC is enabled
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        • System policy modification
        PID:1452
        • C:\Windows\System32\WScript.exe
          "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\8779be4c-4877-451e-a356-2867dba7e75a.vbs"
          3⤵
            PID:1700
          • C:\Windows\System32\WScript.exe
            "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\4771eca1-baeb-4f85-bc5a-bfcaadb7b9e2.vbs"
            3⤵
              PID:1104
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 8 /tr "'C:\Users\All Users\Favorites\lsass.exe'" /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:620
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Users\All Users\Favorites\lsass.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:440
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 7 /tr "'C:\Users\All Users\Favorites\lsass.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1536
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "smsss" /sc MINUTE /mo 13 /tr "'C:\Recovery\c0f67622-1a8a-11ed-ae9f-b21da26d38ed\smss.exe'" /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1816
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Recovery\c0f67622-1a8a-11ed-ae9f-b21da26d38ed\smss.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:540
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "smsss" /sc MINUTE /mo 9 /tr "'C:\Recovery\c0f67622-1a8a-11ed-ae9f-b21da26d38ed\smss.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1372
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 6 /tr "'C:\Recovery\c0f67622-1a8a-11ed-ae9f-b21da26d38ed\sppsvc.exe'" /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:968
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Recovery\c0f67622-1a8a-11ed-ae9f-b21da26d38ed\sppsvc.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1284
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 11 /tr "'C:\Recovery\c0f67622-1a8a-11ed-ae9f-b21da26d38ed\sppsvc.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1732
        • C:\Windows\system32\vssvc.exe
          C:\Windows\system32\vssvc.exe
          1⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:1036

        Network

              MITRE ATT&CK Enterprise v6

              Replay Monitor

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              Downloads

              4771eca1-baeb-4f85-bc5a-bfcaadb7b9e2.vbs

              • Path C:\Users\Admin\AppData\Local\Temp\4771eca1-baeb-4f85-bc5a-bfcaadb7b9e2.vbs
              • Size 490B
              • SHA256 cf3f1b69bbdc009a07d8cc8ee67c1d39dcd290e3c94f0374bef06136144ce9ae
              • MD5 SHA1 SHA512

              8779be4c-4877-451e-a356-2867dba7e75a.vbs

              • Path C:\Users\Admin\AppData\Local\Temp\8779be4c-4877-451e-a356-2867dba7e75a.vbs
              • Size 714B
              • SHA256 6c17f5b0396264945baf0e12102c04081635ff0ec7afa84991ece7a2e96120a2
              • MD5 SHA1 SHA512

              590aee7bdd69b59b.customDestinations-ms

              • Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms
              • Size 7KB
              • SHA256 c44e58bf9c3af6f9d761a89a91356caecd0d1f2ff892d7006445bd30802e02c2
              • MD5 SHA1 SHA512 SSDEEP

              590aee7bdd69b59b.customDestinations-ms

              • Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms
              • Size 7KB
              • SHA256 c44e58bf9c3af6f9d761a89a91356caecd0d1f2ff892d7006445bd30802e02c2
              • MD5 SHA1 SHA512 SSDEEP

              lsass.exe

              • Path C:\Users\All Users\Favorites\lsass.exe
              • Size 3.8MB
              • SHA256 ed9806b6ca433fa7207636e5eb27bfacf475514765712ce37b41dff6890187e9
              • MD5 SHA1 SHA512 SSDEEP

              lsass.exe

              • Path C:\Users\Public\Favorites\lsass.exe
              • Size 3.8MB
              • SHA256 ed9806b6ca433fa7207636e5eb27bfacf475514765712ce37b41dff6890187e9
              • MD5 SHA1 SHA512 SSDEEP

              memory/904-98-0x000007FEEDDA0000-0x000007FEEE8FD000-memory.dmp

              memory/904-106-0x000000000289B000-0x00000000028BA000-memory.dmp

              memory/904-104-0x0000000002894000-0x0000000002897000-memory.dmp

              memory/904-102-0x000000001B770000-0x000000001BA6F000-memory.dmp

              memory/904-97-0x0000000002894000-0x0000000002897000-memory.dmp

              memory/904-86-0x000007FEEB840000-0x000007FEEC263000-memory.dmp

              memory/1016-57-0x0000000000870000-0x0000000000880000-memory.dmp

              memory/1016-59-0x00000000009B0000-0x00000000009BA000-memory.dmp

              memory/1016-70-0x0000000002440000-0x000000000244E000-memory.dmp

              memory/1016-71-0x0000000002450000-0x0000000002458000-memory.dmp

              memory/1016-72-0x0000000002460000-0x000000000246C000-memory.dmp

              memory/1016-73-0x0000000002480000-0x000000000248A000-memory.dmp

              memory/1016-74-0x0000000002490000-0x000000000249C000-memory.dmp

              memory/1016-55-0x0000000000840000-0x000000000085C000-memory.dmp

              memory/1016-61-0x0000000000A10000-0x0000000000A1C000-memory.dmp

              memory/1016-56-0x0000000000860000-0x0000000000868000-memory.dmp

              memory/1016-68-0x0000000002250000-0x000000000225E000-memory.dmp

              memory/1016-69-0x0000000002430000-0x0000000002438000-memory.dmp

              memory/1016-60-0x00000000009C0000-0x0000000000A16000-memory.dmp

              memory/1016-54-0x0000000000050000-0x000000000041A000-memory.dmp

              memory/1016-66-0x0000000002230000-0x0000000002238000-memory.dmp

              memory/1016-58-0x0000000000990000-0x00000000009A6000-memory.dmp

              memory/1016-62-0x0000000000C30000-0x0000000000C42000-memory.dmp

              memory/1016-65-0x0000000002220000-0x0000000002228000-memory.dmp

              memory/1016-67-0x0000000002240000-0x000000000224A000-memory.dmp

              memory/1016-63-0x0000000000C60000-0x0000000000C68000-memory.dmp

              memory/1016-64-0x0000000000C70000-0x0000000000C7C000-memory.dmp

              memory/1452-95-0x00000000005F0000-0x0000000000646000-memory.dmp

              memory/1452-90-0x0000000000E20000-0x00000000011EA000-memory.dmp

              memory/1608-107-0x000000000235B000-0x000000000237A000-memory.dmp

              memory/1608-91-0x000007FEEB840000-0x000007FEEC263000-memory.dmp

              memory/1608-93-0x000007FEEDDA0000-0x000007FEEE8FD000-memory.dmp

              memory/1608-103-0x0000000002354000-0x0000000002357000-memory.dmp

              memory/1608-99-0x000000001B700000-0x000000001B9FF000-memory.dmp

              memory/1608-105-0x0000000002354000-0x0000000002357000-memory.dmp

              memory/1608-92-0x0000000002354000-0x0000000002357000-memory.dmp

              memory/2000-101-0x000000000249B000-0x00000000024BA000-memory.dmp

              memory/2000-84-0x000007FEEB840000-0x000007FEEC263000-memory.dmp

              memory/2000-96-0x0000000002494000-0x0000000002497000-memory.dmp

              memory/2000-100-0x0000000002494000-0x0000000002497000-memory.dmp

              memory/2000-94-0x000007FEEDDA0000-0x000007FEEE8FD000-memory.dmp

              memory/2000-79-0x000007FEFC2C1000-0x000007FEFC2C3000-memory.dmp