Analysis

  • max time kernel
    125s
  • max time network
    125s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    03-12-2020 07:47

General

  • Target

    313f90db50cc3d4164b90d648b83cd75.exe

  • Size

    671KB

  • MD5

    313f90db50cc3d4164b90d648b83cd75

  • SHA1

    f861f285705a4eb7ef51de27baef8dae05c36e15

  • SHA256

    69057a29d94d0ae3e51c435df396178b093d057db5addcdb273dcd5aedc6e1ef

  • SHA512

    cb0acb7106a328a83848812e85d7f998e5c0ef0780b4f0c20ab33cf046053202c265c40d7f68ee156d2ad4f80c114529ef8d8e793302d45991337a5cf37d1546

Malware Config

Signatures

  • CryptBot

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

  • Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs
  • Blocklisted process makes network request 4 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 8 IoCs
  • Checks BIOS information in registry 2 TTPs 10 IoCs

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

  • Drops startup file 1 IoCs
  • Identifies Wine through registry keys 2 TTPs 5 IoCs

    Wine is a compatibility layer capable of running Windows applications, which can be used as sandboxing environment.

  • Loads dropped DLL 3 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 NtSetInformationThreadHideFromDebugger 5 IoCs
  • autoit_exe 2 IoCs

    AutoIT scripts compiled to PE executables.

  • Drops file in Program Files directory 8 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.

  • Creates scheduled task(s) 1 TTPs 1 IoCs

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

  • Delays execution with timeout.exe 3 IoCs
  • Modifies registry class 1 IoCs
  • Modifies system certificate store 2 TTPs 2 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 10 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of FindShellTrayWindow 5 IoCs
  • Suspicious use of SendNotifyMessage 3 IoCs
  • Suspicious use of WriteProcessMemory 60 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\313f90db50cc3d4164b90d648b83cd75.exe
    "C:\Users\Admin\AppData\Local\Temp\313f90db50cc3d4164b90d648b83cd75.exe"
    1⤵
    • Checks processor information in registry
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of WriteProcessMemory
    PID:4048
    • C:\Users\Admin\AppData\Local\Temp\File2.exe
      "C:\Users\Admin\AppData\Local\Temp\File2.exe"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Drops file in Program Files directory
      • Suspicious use of WriteProcessMemory
      PID:2724
      • C:\Program Files (x86)\solfer\boleroh\lvfuk.exe
        "C:\Program Files (x86)\solfer\boleroh\lvfuk.exe"
        3⤵
        • Executes dropped EXE
        • Checks BIOS information in registry
        • Identifies Wine through registry keys
        • Suspicious use of NtSetInformationThreadHideFromDebugger
        • Checks processor information in registry
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:4012
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\system32\cmd.exe" /c start "" "C:\Users\Admin\AppData\Local\Temp\egctmpmrbo.exe"
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:3132
          • C:\Users\Admin\AppData\Local\Temp\egctmpmrbo.exe
            "C:\Users\Admin\AppData\Local\Temp\egctmpmrbo.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of WriteProcessMemory
            PID:3580
            • C:\Windows\SysWOW64\rundll32.exe
              C:\Windows\system32\rundll32.exe C:\Users\Admin\AppData\Local\Temp\EGCTMP~1.DLL,Z C:\Users\Admin\AppData\Local\Temp\EGCTMP~1.EXE
              6⤵
              • Loads dropped DLL
              PID:3516
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\system32\cmd.exe" /c start "" "C:\Users\Admin\AppData\Local\Temp\nviwklwlbmhl.vbs"
          4⤵
          • Modifies registry class
          • Suspicious use of WriteProcessMemory
          PID:1364
          • C:\Windows\SysWOW64\WScript.exe
            "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\nviwklwlbmhl.vbs"
            5⤵
            • Blocklisted process makes network request
            • Modifies system certificate store
            PID:3668
      • C:\Program Files (x86)\solfer\6las.exe
        "C:\Program Files (x86)\solfer\6las.exe"
        3⤵
        • Executes dropped EXE
        • Checks BIOS information in registry
        • Identifies Wine through registry keys
        • Suspicious use of NtSetInformationThreadHideFromDebugger
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:3012
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\system32\cmd.exe" /c rd /s /q C:\ProgramData\owjhardlnins & timeout 2 & del /f /q "C:\Program Files (x86)\solfer\6las.exe"
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:2204
          • C:\Windows\SysWOW64\timeout.exe
            timeout 2
            5⤵
            • Delays execution with timeout.exe
            PID:3344
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\system32\cmd.exe" /c rd /s /q C:\ProgramData\owjhardlnins & timeout 2 & del /f /q "C:\Program Files (x86)\solfer\6las.exe"
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:2312
          • C:\Windows\SysWOW64\timeout.exe
            timeout 2
            5⤵
            • Delays execution with timeout.exe
            PID:4004
      • C:\Program Files (x86)\solfer\4ger.exe
        "C:\Program Files (x86)\solfer\4ger.exe"
        3⤵
        • Executes dropped EXE
        • Checks BIOS information in registry
        • Drops startup file
        • Identifies Wine through registry keys
        • Suspicious use of NtSetInformationThreadHideFromDebugger
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:3824
        • C:\Users\Admin\AppData\Roaming\Smart Clock\SmartClock.exe
          "C:\Users\Admin\AppData\Roaming\Smart Clock\SmartClock.exe"
          4⤵
          • Executes dropped EXE
          • Checks BIOS information in registry
          • Identifies Wine through registry keys
          • Suspicious use of NtSetInformationThreadHideFromDebugger
          • Suspicious behavior: AddClipboardFormatListener
          • Suspicious behavior: EnumeratesProcesses
          PID:3972
      • C:\Program Files (x86)\solfer\startveu.exe
        "C:\Program Files (x86)\solfer\startveu.exe"
        3⤵
        • Executes dropped EXE
        • Checks BIOS information in registry
        • Identifies Wine through registry keys
        • Suspicious use of NtSetInformationThreadHideFromDebugger
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of FindShellTrayWindow
        • Suspicious use of SendNotifyMessage
        • Suspicious use of WriteProcessMemory
        PID:1292
        • C:\Users\Admin\AppData\Local\Temp\CL_Debug_Log.txt
          C:\Users\Admin\AppData\Local\Temp\CL_Debug_Log.txt e -p"JDQJndnqwdnqw2139dn21n3b312idDQDB" "C:\Users\Admin\AppData\Local\Temp\CR_Debug_Log.txt" -o"C:\Users\Admin\AppData\Local\Temp\"
          4⤵
          • Executes dropped EXE
          • Suspicious use of AdjustPrivilegeToken
          PID:3736
        • C:\Windows\SysWOW64\cmd.exe
          C:\Windows\system32\cmd.exe /c schtasks.exe /Create /XML "C:\Users\Admin\AppData\Local\Temp\SystemCheck.xml" /TN "System\SystemCheck"
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:2088
          • C:\Windows\SysWOW64\schtasks.exe
            schtasks.exe /Create /XML "C:\Users\Admin\AppData\Local\Temp\SystemCheck.xml" /TN "System\SystemCheck"
            5⤵
            • Creates scheduled task(s)
            PID:648
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\system32\cmd.exe" /c rd /s /q C:\Users\Admin\AppData\Local\Temp\GWSltiL & timeout 2 & del /f /q "C:\Users\Admin\AppData\Local\Temp\313f90db50cc3d4164b90d648b83cd75.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3724
      • C:\Windows\SysWOW64\timeout.exe
        timeout 2
        3⤵
        • Delays execution with timeout.exe
        PID:4076

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • memory/1292-32-0x000000000A9B0000-0x000000000A9B1000-memory.dmp

    Filesize

    4KB

  • memory/1292-34-0x000000000B1B0000-0x000000000B1B1000-memory.dmp

    Filesize

    4KB

  • memory/3012-30-0x0000000005800000-0x0000000005801000-memory.dmp

    Filesize

    4KB

  • memory/3012-27-0x0000000005000000-0x0000000005001000-memory.dmp

    Filesize

    4KB

  • memory/3580-63-0x0000000002D00000-0x0000000002D01000-memory.dmp

    Filesize

    4KB

  • memory/3824-29-0x0000000004810000-0x0000000004811000-memory.dmp

    Filesize

    4KB

  • memory/3824-35-0x0000000004810000-0x0000000004811000-memory.dmp

    Filesize

    4KB

  • memory/3824-33-0x0000000005010000-0x0000000005011000-memory.dmp

    Filesize

    4KB

  • memory/3972-40-0x0000000005180000-0x0000000005181000-memory.dmp

    Filesize

    4KB

  • memory/3972-39-0x0000000004980000-0x0000000004981000-memory.dmp

    Filesize

    4KB

  • memory/4012-31-0x00000000052F0000-0x00000000052F1000-memory.dmp

    Filesize

    4KB

  • memory/4012-28-0x0000000004AF0000-0x0000000004AF1000-memory.dmp

    Filesize

    4KB

  • memory/4048-2-0x00000000029F0000-0x00000000029F1000-memory.dmp

    Filesize

    4KB