Analysis

  • max time kernel
    128s
  • max time network
    179s
  • platform
    windows7_x64
  • resource
    win7v20210408
  • submitted
    23/08/2021, 13:29

General

  • Target
    eb749e44a75448c807d0af28f8b83e66.exe
  • Size 623KB
  • Sample210823-phegrv7w52
  • SHA256 56086c245c079cb9345f744d6c352931877ea6aa2286950f9451d3ec372d6e19
  • MD5 SHA1 SHA512

Malware Config

Extracted

Family
  • cryptbot

C2
  • bunopq12.top

  • morkix01.top

Attributes
  • payload_url

    http://tobdol01.top/download.php?file=lv.exe

Signatures

  • CryptBot

    A C++ stealer distributed widely in bundle with other software.

  • CryptBot Payload 2 IoCs
  • suricata: ET MALWARE Terse alphanumeric executable downloader high likelihood of being hostile

    suricata: ET MALWARE Terse alphanumeric executable downloader high likelihood of being hostile

  • Blocklisted process makes network request 5 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 7 IoCs
  • Deletes itself 1 IoCs
  • Drops startup file 1 IoCs
  • Loads dropped DLL 25 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 2 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Legitimate hosting services abused for malware hosting/C2 1 TTPs
  • Looks up external IP address via web service 1 IoCs

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

  • Drops file in Program Files directory 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Checks processor information in registry 2 TTPs 4 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Delays execution with timeout.exe 1 IoCs
  • Modifies system certificate store 2 TTPs 5 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious use of FindShellTrayWindow 8 IoCs
  • Suspicious use of SendNotifyMessage 6 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\eb749e44a75448c807d0af28f8b83e66.exe
    "C:\Users\Admin\AppData\Local\Temp\eb749e44a75448c807d0af28f8b83e66.exe"
    1⤵
    • Loads dropped DLL
    • Checks processor information in registry
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of WriteProcessMemory
    PID:628
    • C:\Users\Admin\AppData\Local\Temp\Filett.exe
      "C:\Users\Admin\AppData\Local\Temp\Filett.exe"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Drops file in Program Files directory
      • Suspicious use of WriteProcessMemory
      PID:1048
      • C:\Users\Admin\AppData\Local\Temp\yankee\vts.exe
        "C:\Users\Admin\AppData\Local\Temp\yankee\vts.exe"
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • Adds Run key to start application
        • Suspicious use of WriteProcessMemory
        PID:1080
        • C:\Windows\SysWOW64\dllhost.exe
          dllhost.exe
          4⤵
            PID:1356
          • C:\Windows\SysWOW64\cmd.exe
            cmd /c cmd < Parve.vss
            4⤵
            • Suspicious use of WriteProcessMemory
            PID:532
            • C:\Windows\SysWOW64\cmd.exe
              cmd
              5⤵
              • Loads dropped DLL
              • Suspicious use of WriteProcessMemory
              PID:924
              • C:\Windows\SysWOW64\findstr.exe
                findstr /V /R "^LMdJCxRSRoddjdlTxyoqClWafTdkkbEWYdXeiJSojeIIDRNHLutVIRNBQXzJtFGzDxaWziMKjZNmBhOnyJAyaIhuCcjpdprGvgtpm$" Puramente.vss
                6⤵
                  PID:1948
                • C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\Larghe.exe.com
                  Larghe.exe.com V
                  6⤵
                  • Executes dropped EXE
                  • Loads dropped DLL
                  • Suspicious use of FindShellTrayWindow
                  • Suspicious use of SendNotifyMessage
                  PID:948
                  • C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\Larghe.exe.com
                    C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\Larghe.exe.com V
                    7⤵
                    • Executes dropped EXE
                    • Loads dropped DLL
                    • Checks processor information in registry
                    • Modifies system certificate store
                    • Suspicious use of FindShellTrayWindow
                    • Suspicious use of SendNotifyMessage
                    PID:780
                    • C:\Users\Admin\AppData\Local\Temp\brxsfhhnn.exe
                      "C:\Users\Admin\AppData\Local\Temp\brxsfhhnn.exe"
                      8⤵
                      • Executes dropped EXE
                      • Loads dropped DLL
                      PID:972
                    • C:\Windows\SysWOW64\WScript.exe
                      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\tsmaepohqn.vbs"
                      8⤵
                        PID:1260
                      • C:\Windows\SysWOW64\WScript.exe
                        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\hvyivmdwixs.vbs"
                        8⤵
                        • Blocklisted process makes network request
                        • Modifies system certificate store
                        PID:1692
                  • C:\Windows\SysWOW64\PING.EXE
                    ping QWOCTUPM -n 30
                    6⤵
                    • Runs ping.exe
                    PID:1648
            • C:\Users\Admin\AppData\Local\Temp\yankee\fuk.exe
              "C:\Users\Admin\AppData\Local\Temp\yankee\fuk.exe"
              3⤵
              • Executes dropped EXE
              • Drops startup file
              • Loads dropped DLL
              PID:2028
              • C:\Users\Admin\AppData\Roaming\Smart Clock\SmartClock.exe
                "C:\Users\Admin\AppData\Roaming\Smart Clock\SmartClock.exe"
                4⤵
                • Executes dropped EXE
                • Loads dropped DLL
                • Suspicious behavior: AddClipboardFormatListener
                PID:1808
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\system32\cmd.exe" /c rd /s /q C:\Users\Admin\AppData\Local\Temp\UGqfYKcUtVXq & timeout 2 & del /f /q "C:\Users\Admin\AppData\Local\Temp\eb749e44a75448c807d0af28f8b83e66.exe"
            2⤵
            • Deletes itself
            • Suspicious use of WriteProcessMemory
            PID:1924
            • C:\Windows\SysWOW64\timeout.exe
              timeout 2
              3⤵
              • Delays execution with timeout.exe
              PID:376

        Network

              MITRE ATT&CK Enterprise v6

              Replay Monitor

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              Downloads

              memory/628-60-0x0000000000340000-0x00000000003E0000-memory.dmp

              memory/628-61-0x0000000000400000-0x0000000002406000-memory.dmp

              memory/628-64-0x0000000074731000-0x0000000074733000-memory.dmp

              memory/628-59-0x00000000757C1000-0x00000000757C3000-memory.dmp

              memory/628-63-0x0000000002480000-0x0000000002481000-memory.dmp

              memory/628-62-0x00000000749E1000-0x00000000749E3000-memory.dmp

              memory/972-145-0x0000000002DE0000-0x0000000004E6C000-memory.dmp

              memory/972-146-0x0000000000400000-0x000000000248C000-memory.dmp

              memory/1808-127-0x0000000000400000-0x00000000023B4000-memory.dmp

              memory/2028-116-0x0000000000270000-0x0000000000296000-memory.dmp

              memory/2028-117-0x0000000000400000-0x00000000023B4000-memory.dmp