Analysis

  • max time kernel
    119s
  • max time network
    159s
  • platform
    windows7_x64
  • resource
    win7-en-20211208
  • submitted
    30-01-2022 22:11

General

  • Target

    900eb9fef2464a9f9d8f8e6583bcb8a1.exe

  • Size

    1.4MB

  • MD5

    900eb9fef2464a9f9d8f8e6583bcb8a1

  • SHA1

    5941e80798f6aa3ea56bc4891494a27f55bb2c10

  • SHA256

    40fb662761491390c1e86e0e2d7cfc671b2239a5c3109ee0c76c963cf1f1fd62

  • SHA512

    2f3a72d450c35a96ed9ac40bd889cb558d42d15581d1df91857551dee7f7429ebaa4e6d67cfa8b1f56b590f924306d0ac35bbe880c33ff14933e28291aa2416e

Malware Config

Signatures

  • DcRat 8 IoCs

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

  • Modifies WinLogon for persistence 2 TTPs 6 IoCs
  • Process spawned unexpected child process 6 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)

  • Executes dropped EXE 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
  • Adds Run key to start application 2 TTPs 12 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.

  • Drops file in System32 directory 7 IoCs
  • Drops file in Windows directory 2 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 6 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 19 IoCs
  • Suspicious use of AdjustPrivilegeToken 8 IoCs
  • Suspicious use of WriteProcessMemory 33 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\900eb9fef2464a9f9d8f8e6583bcb8a1.exe
    "C:\Users\Admin\AppData\Local\Temp\900eb9fef2464a9f9d8f8e6583bcb8a1.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1592
    • C:\Users\Public\Videos\123.exe
      "C:\Users\Public\Videos\123.exe"
      2⤵
      • DcRat
      • Modifies WinLogon for persistence
      • Executes dropped EXE
      • Adds Run key to start application
      • Drops file in System32 directory
      • Drops file in Windows directory
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:520
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\Public\Videos\123.exe'
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1704
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Windows\System32\wbadmin\csrss.exe'
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1780
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Windows\System32\shadow\sppsvc.exe'
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:724
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Documents and Settings\lsm.exe'
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1380
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\MSOCache\All Users\{90140000-0011-0000-0000-0000000FF1CE}-C\System.exe'
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1020
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Windows\System32\mfc120cht\lsass.exe'
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1920
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Windows\notepad\explorer.exe'
        3⤵
          PID:1196
        • C:\Windows\System32\cmd.exe
          "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\OkmwXmalQi.bat"
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:2016
          • C:\Windows\system32\w32tm.exe
            w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
            4⤵
              PID:1284
            • C:\Windows\System32\mfc120cht\lsass.exe
              "C:\Windows\System32\mfc120cht\lsass.exe"
              4⤵
              • Executes dropped EXE
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of AdjustPrivilegeToken
              PID:328
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\System32\wbadmin\csrss.exe'" /rl HIGHEST /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:736
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Windows\notepad\explorer.exe'" /rl HIGHEST /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1504
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Windows\System32\shadow\sppsvc.exe'" /rl HIGHEST /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1804
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\System32\mfc120cht\lsass.exe'" /rl HIGHEST /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:2040
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Documents and Settings\lsm.exe'" /rl HIGHEST /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:952
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0011-0000-0000-0000000FF1CE}-C\System.exe'" /rl HIGHEST /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:2028

      Network

      MITRE ATT&CK Enterprise v6

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Local\Temp\OkmwXmalQi.bat

        MD5

        9b8996796ada3fa4774e49e34d724e90

        SHA1

        14a42b0b78e8f37ab117a12ef93d75e017254989

        SHA256

        a23872d65fd4005240dfa74953835aad07e004ffbb96ea01d8962750e1b7fb2e

        SHA512

        b40a2372a2eaaf90284d25dfb13c02be11913bbe257eff6a25dd62482b57e5cdfce6b947c346ea799a2e5d22488c728c6e90df7100577ed20f2867f3538acf5e

      • C:\Users\Public\Videos\123.exe

        MD5

        59201b09f6fc392bdb47394618c44123

        SHA1

        cab97b0ebf4d41f9e6105db3a3ebaf47998977e6

        SHA256

        bb5e6247f19aab28d71dc53718c43d397e2424ea57325c4c213988ea22474da0

        SHA512

        bdf482b3c6880b2de7c763dd8f5fa6d45b83a332b377d1f68fa540d21d5e1e00dd819b153d47781008b65dd6e96e8aa58ab89bbc7cdb3887d8356662021ed362

      • C:\Users\Public\Videos\123.exe

        MD5

        59201b09f6fc392bdb47394618c44123

        SHA1

        cab97b0ebf4d41f9e6105db3a3ebaf47998977e6

        SHA256

        bb5e6247f19aab28d71dc53718c43d397e2424ea57325c4c213988ea22474da0

        SHA512

        bdf482b3c6880b2de7c763dd8f5fa6d45b83a332b377d1f68fa540d21d5e1e00dd819b153d47781008b65dd6e96e8aa58ab89bbc7cdb3887d8356662021ed362

      • C:\Windows\System32\mfc120cht\lsass.exe

        MD5

        59201b09f6fc392bdb47394618c44123

        SHA1

        cab97b0ebf4d41f9e6105db3a3ebaf47998977e6

        SHA256

        bb5e6247f19aab28d71dc53718c43d397e2424ea57325c4c213988ea22474da0

        SHA512

        bdf482b3c6880b2de7c763dd8f5fa6d45b83a332b377d1f68fa540d21d5e1e00dd819b153d47781008b65dd6e96e8aa58ab89bbc7cdb3887d8356662021ed362

      • C:\Windows\System32\mfc120cht\lsass.exe

        MD5

        59201b09f6fc392bdb47394618c44123

        SHA1

        cab97b0ebf4d41f9e6105db3a3ebaf47998977e6

        SHA256

        bb5e6247f19aab28d71dc53718c43d397e2424ea57325c4c213988ea22474da0

        SHA512

        bdf482b3c6880b2de7c763dd8f5fa6d45b83a332b377d1f68fa540d21d5e1e00dd819b153d47781008b65dd6e96e8aa58ab89bbc7cdb3887d8356662021ed362

      • memory/328-97-0x0000000001380000-0x00000000014D8000-memory.dmp

        Filesize

        1.3MB

      • memory/328-99-0x000000001AF80000-0x000000001AF82000-memory.dmp

        Filesize

        8KB

      • memory/328-101-0x0000000000410000-0x0000000000422000-memory.dmp

        Filesize

        72KB

      • memory/520-66-0x00000000005F0000-0x00000000005FA000-memory.dmp

        Filesize

        40KB

      • memory/520-60-0x00000000003D0000-0x00000000003E0000-memory.dmp

        Filesize

        64KB

      • memory/520-64-0x00000000005D0000-0x00000000005DC000-memory.dmp

        Filesize

        48KB

      • memory/520-65-0x00000000005E0000-0x00000000005EC000-memory.dmp

        Filesize

        48KB

      • memory/520-62-0x0000000000500000-0x0000000000508000-memory.dmp

        Filesize

        32KB

      • memory/520-61-0x00000000003E0000-0x00000000003EC000-memory.dmp

        Filesize

        48KB

      • memory/520-57-0x0000000000ED0000-0x0000000001028000-memory.dmp

        Filesize

        1.3MB

      • memory/520-63-0x0000000000510000-0x0000000000522000-memory.dmp

        Filesize

        72KB

      • memory/520-58-0x000000001B060000-0x000000001B062000-memory.dmp

        Filesize

        8KB

      • memory/520-59-0x00000000003C0000-0x00000000003D0000-memory.dmp

        Filesize

        64KB

      • memory/724-107-0x000000001B820000-0x000000001BB1F000-memory.dmp

        Filesize

        3.0MB

      • memory/724-82-0x0000000002A04000-0x0000000002A07000-memory.dmp

        Filesize

        12KB

      • memory/724-81-0x0000000002A02000-0x0000000002A04000-memory.dmp

        Filesize

        8KB

      • memory/724-80-0x0000000002A00000-0x0000000002A02000-memory.dmp

        Filesize

        8KB

      • memory/724-98-0x000007FEF3450000-0x000007FEF3FAD000-memory.dmp

        Filesize

        11.4MB

      • memory/724-114-0x0000000002A0B000-0x0000000002A2A000-memory.dmp

        Filesize

        124KB

      • memory/1020-89-0x00000000023E2000-0x00000000023E4000-memory.dmp

        Filesize

        8KB

      • memory/1020-112-0x00000000023EB000-0x000000000240A000-memory.dmp

        Filesize

        124KB

      • memory/1020-108-0x000000001B810000-0x000000001BB0F000-memory.dmp

        Filesize

        3.0MB

      • memory/1020-90-0x00000000023E4000-0x00000000023E7000-memory.dmp

        Filesize

        12KB

      • memory/1020-88-0x00000000023E0000-0x00000000023E2000-memory.dmp

        Filesize

        8KB

      • memory/1020-100-0x000007FEF3450000-0x000007FEF3FAD000-memory.dmp

        Filesize

        11.4MB

      • memory/1380-109-0x000000001B790000-0x000000001BA8F000-memory.dmp

        Filesize

        3.0MB

      • memory/1380-94-0x0000000002934000-0x0000000002937000-memory.dmp

        Filesize

        12KB

      • memory/1380-93-0x0000000002932000-0x0000000002934000-memory.dmp

        Filesize

        8KB

      • memory/1380-110-0x000000000293B000-0x000000000295A000-memory.dmp

        Filesize

        124KB

      • memory/1380-92-0x0000000002930000-0x0000000002932000-memory.dmp

        Filesize

        8KB

      • memory/1592-54-0x000007FEFC521000-0x000007FEFC523000-memory.dmp

        Filesize

        8KB

      • memory/1704-87-0x0000000002472000-0x0000000002474000-memory.dmp

        Filesize

        8KB

      • memory/1704-86-0x0000000002370000-0x0000000002472000-memory.dmp

        Filesize

        1.0MB

      • memory/1704-115-0x000000000247B000-0x000000000249A000-memory.dmp

        Filesize

        124KB

      • memory/1704-103-0x000007FEF3450000-0x000007FEF3FAD000-memory.dmp

        Filesize

        11.4MB

      • memory/1704-91-0x0000000002474000-0x0000000002477000-memory.dmp

        Filesize

        12KB

      • memory/1780-75-0x000007FEF3450000-0x000007FEF3FAD000-memory.dmp

        Filesize

        11.4MB

      • memory/1780-79-0x0000000002924000-0x0000000002927000-memory.dmp

        Filesize

        12KB

      • memory/1780-106-0x000000001B7E0000-0x000000001BADF000-memory.dmp

        Filesize

        3.0MB

      • memory/1780-78-0x0000000002922000-0x0000000002924000-memory.dmp

        Filesize

        8KB

      • memory/1780-77-0x0000000002920000-0x0000000002922000-memory.dmp

        Filesize

        8KB

      • memory/1780-113-0x000000000292B000-0x000000000294A000-memory.dmp

        Filesize

        124KB

      • memory/1920-104-0x000000001B9E0000-0x000000001BCDF000-memory.dmp

        Filesize

        3.0MB

      • memory/1920-76-0x000007FEF3450000-0x000007FEF3FAD000-memory.dmp

        Filesize

        11.4MB

      • memory/1920-111-0x0000000002A1B000-0x0000000002A3A000-memory.dmp

        Filesize

        124KB

      • memory/1920-83-0x0000000002A10000-0x0000000002A12000-memory.dmp

        Filesize

        8KB

      • memory/1920-84-0x0000000002A12000-0x0000000002A14000-memory.dmp

        Filesize

        8KB

      • memory/1920-85-0x0000000002A14000-0x0000000002A17000-memory.dmp

        Filesize

        12KB