Analysis

  • max time kernel
    150s
  • max time network
    124s
  • platform
    windows10_x64
  • resource
    win10v20210410
  • submitted
    17/06/2021, 11:09

General

  • Target
    445442bd90e6ed6ee86968e02828e7e9.exe
  • Size 750KB
  • Sample210617-kwckax67f2
  • SHA256 c234cdf19dcd42a7c6acac0c7086c59b41d2adbf58bb6f03f3f4e18ed30c17eb
  • MD5 SHA1 SHA512

Malware Config

Extracted

Family
  • cryptbot

C2
  • kiykhd42.top

  • morzui04.top

Attributes
  • payload_url

    http://peoqba05.top/download.php?file=lv.exe

Signatures

  • CryptBot

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

  • CryptBot Payload 2 IoCs
  • Blocklisted process makes network request 7 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 5 IoCs
  • Drops startup file 1 IoCs
  • Loads dropped DLL 5 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
  • 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.

  • Suspicious use of SetThreadContext 1 IoCs
  • Drops file in Program Files directory 5 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 25 IoCs

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

  • Delays execution with timeout.exe 1 IoCs
  • Modifies registry class 1 IoCs
  • Modifies system certificate store 2 TTPs 4 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 16 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of FindShellTrayWindow 3 IoCs
  • Suspicious use of WriteProcessMemory 54 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\445442bd90e6ed6ee86968e02828e7e9.exe
    "C:\Users\Admin\AppData\Local\Temp\445442bd90e6ed6ee86968e02828e7e9.exe"
    1⤵
    • Checks processor information in registry
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of WriteProcessMemory
    PID:1852
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\system32\cmd.exe" /c start "" "C:\Users\Admin\AppData\Local\Temp\mSdpiQ.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1272
      • C:\Users\Admin\AppData\Local\Temp\mSdpiQ.exe
        "C:\Users\Admin\AppData\Local\Temp\mSdpiQ.exe"
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • Drops file in Program Files directory
        • Suspicious use of WriteProcessMemory
        PID:740
        • C:\Users\Admin\AppData\Local\Temp\New Feature\4.exe
          "C:\Users\Admin\AppData\Local\Temp\New Feature\4.exe"
          4⤵
          • Executes dropped EXE
          • Drops startup file
          • Suspicious use of WriteProcessMemory
          PID:1580
          • C:\Users\Admin\AppData\Roaming\Smart Clock\SmartClock.exe
            "C:\Users\Admin\AppData\Roaming\Smart Clock\SmartClock.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious behavior: AddClipboardFormatListener
            PID:2580
        • C:\Users\Admin\AppData\Local\Temp\New Feature\vpn.exe
          "C:\Users\Admin\AppData\Local\Temp\New Feature\vpn.exe"
          4⤵
          • Executes dropped EXE
          • Checks processor information in registry
          • Modifies registry class
          • Suspicious use of WriteProcessMemory
          PID:1812
          • C:\Users\Admin\AppData\Local\Temp\opetnnfitqll.exe
            "C:\Users\Admin\AppData\Local\Temp\opetnnfitqll.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of WriteProcessMemory
            PID:3416
            • C:\Windows\SysWOW64\rundll32.exe
              C:\Windows\system32\rundll32.exe C:\Users\Admin\AppData\Local\Temp\OPETNN~1.TMP,S C:\Users\Admin\AppData\Local\Temp\OPETNN~1.EXE
              6⤵
              • Blocklisted process makes network request
              • Loads dropped DLL
              • Drops file in Program Files directory
              • Suspicious use of WriteProcessMemory
              PID:2164
              • C:\Windows\SysWOW64\rundll32.exe
                C:\Windows\system32\rundll32.exe C:\PROGRA~3\LAUVHF~1\JHAKLD~1.TMP,WDsdbDR4UQ== C:\Users\Admin\AppData\Local\Temp\OPETNN~1.TMP
                7⤵
                • Blocklisted process makes network request
                • Loads dropped DLL
                • Suspicious use of SetThreadContext
                • Checks processor information in registry
                • Modifies system certificate store
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                • Suspicious use of FindShellTrayWindow
                • Suspicious use of WriteProcessMemory
                PID:2504
                • C:\Windows\system32\rundll32.exe
                  C:\Windows\system32\rundll32.exe C:\Windows\system32\shell32.dll,#61 31801
                  8⤵
                    PID:2420
                  • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
                    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -Executionpolicy bypass -File "C:\Users\Admin\AppData\Local\Temp\tmp5BFC.tmp.ps1"
                    8⤵
                    • Suspicious behavior: EnumeratesProcesses
                    • Suspicious use of AdjustPrivilegeToken
                    PID:496
                  • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
                    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -Executionpolicy bypass -File "C:\Users\Admin\AppData\Local\Temp\tmp6E1E.tmp.ps1"
                    8⤵
                    • Suspicious behavior: EnumeratesProcesses
                    • Suspicious use of AdjustPrivilegeToken
                    • Suspicious use of WriteProcessMemory
                    PID:2104
                    • C:\Windows\SysWOW64\nslookup.exe
                      "C:\Windows\system32\nslookup.exe" -type=any localhost
                      9⤵
                        PID:808
                    • C:\Windows\SysWOW64\schtasks.exe
                      schtasks /End /tn \Microsoft\Windows\Wininet\CacheTask
                      8⤵
                        PID:1396
                      • C:\Windows\SysWOW64\schtasks.exe
                        schtasks /Run /tn \Microsoft\Windows\Wininet\CacheTask
                        8⤵
                          PID:3600
                  • C:\Windows\SysWOW64\WScript.exe
                    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\hqwsardm.vbs"
                    5⤵
                      PID:3756
                    • C:\Windows\SysWOW64\WScript.exe
                      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\fkrlsiinca.vbs"
                      5⤵
                      • Blocklisted process makes network request
                      • Modifies system certificate store
                      PID:1316
              • C:\Windows\SysWOW64\cmd.exe
                "C:\Windows\system32\cmd.exe" /c rd /s /q C:\Users\Admin\AppData\Local\Temp\iIeXmbiBnFqCG & timeout 3 & del /f /q "C:\Users\Admin\AppData\Local\Temp\445442bd90e6ed6ee86968e02828e7e9.exe"
                2⤵
                • Suspicious use of WriteProcessMemory
                PID:3876
                • C:\Windows\SysWOW64\timeout.exe
                  timeout 3
                  3⤵
                  • Delays execution with timeout.exe
                  PID:3568

            Network

                  MITRE ATT&CK Enterprise v6

                  Replay Monitor

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                  Downloads

                  memory/496-197-0x00000000084F0000-0x00000000084F1000-memory.dmp

                  memory/496-184-0x0000000007980000-0x0000000007981000-memory.dmp

                  memory/496-189-0x0000000008110000-0x0000000008111000-memory.dmp

                  memory/496-187-0x0000000007950000-0x0000000007951000-memory.dmp

                  memory/496-191-0x0000000008240000-0x0000000008241000-memory.dmp

                  memory/496-196-0x0000000009920000-0x0000000009921000-memory.dmp

                  memory/496-186-0x0000000007A60000-0x0000000007A61000-memory.dmp

                  memory/496-185-0x00000000079F0000-0x00000000079F1000-memory.dmp

                  memory/496-188-0x0000000007E90000-0x0000000007E91000-memory.dmp

                  memory/496-183-0x00000000070B0000-0x00000000070B1000-memory.dmp

                  memory/496-198-0x0000000006CB0000-0x0000000006CB1000-memory.dmp

                  memory/496-182-0x0000000006AC2000-0x0000000006AC3000-memory.dmp

                  memory/496-201-0x0000000006AC3000-0x0000000006AC4000-memory.dmp

                  memory/496-179-0x00000000069A0000-0x00000000069A1000-memory.dmp

                  memory/496-181-0x0000000006AC0000-0x0000000006AC1000-memory.dmp

                  memory/496-180-0x0000000007100000-0x0000000007101000-memory.dmp

                  memory/1580-139-0x0000000000400000-0x00000000008F2000-memory.dmp

                  memory/1580-138-0x0000000002420000-0x0000000002446000-memory.dmp

                  memory/1812-141-0x0000000000400000-0x00000000008F3000-memory.dmp

                  memory/1812-140-0x00000000009F0000-0x0000000000B3A000-memory.dmp

                  memory/1852-114-0x00000000025A0000-0x0000000002681000-memory.dmp

                  memory/1852-115-0x0000000000400000-0x0000000000959000-memory.dmp

                  memory/2104-214-0x0000000008950000-0x0000000008951000-memory.dmp

                  memory/2104-229-0x0000000004EE3000-0x0000000004EE4000-memory.dmp

                  memory/2104-218-0x0000000004EE2000-0x0000000004EE3000-memory.dmp

                  memory/2104-217-0x0000000004EE0000-0x0000000004EE1000-memory.dmp

                  memory/2104-211-0x00000000083D0000-0x00000000083D1000-memory.dmp

                  memory/2164-153-0x0000000004400000-0x0000000004541000-memory.dmp

                  memory/2420-175-0x0000016ED0760000-0x0000016ED0911000-memory.dmp

                  memory/2420-174-0x0000000000510000-0x00000000006B0000-memory.dmp

                  memory/2504-173-0x0000000005EC0000-0x0000000005EC1000-memory.dmp

                  memory/2504-162-0x0000000000C90000-0x0000000000DD1000-memory.dmp

                  memory/2580-142-0x0000000000980000-0x0000000000ACA000-memory.dmp

                  memory/2580-143-0x0000000000400000-0x00000000008F2000-memory.dmp

                  memory/3416-154-0x0000000002840000-0x000000000292D000-memory.dmp

                  memory/3416-155-0x0000000000400000-0x00000000009B6000-memory.dmp