Overview

overview

10

Static

static

99ee7cf74c...e9.exe

windows7_x64

10

99ee7cf74c...e9.exe

windows10_x64

10

Analysis

  • max time kernel
    300s
  • max time network
    300s
  • platform
    windows7_x64
  • resource
    win7-en-20211014
  • submitted
    08/12/2021, 11:39

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General

  • Target

    99ee7cf74c8de999f2a1cc8cefacad3c866a86e78c87a56323729bfad967a4e9.exe

  • Size

    250KB

  • MD5

    41fd1099e6e46ddd0015c7c0ed9425a5

  • SHA1

    9f9ee018b7deeffa22ab15ffac3326fddc70a0a2

  • SHA256

    99ee7cf74c8de999f2a1cc8cefacad3c866a86e78c87a56323729bfad967a4e9

  • SHA512

    3c7962c1e699046f7be9005a5ba2ece6f56f6e07fdae0f5ad0cb1c83aa55159f21f506f5c6dcf1490f35e00e72fcb1c340f047459f0f339a90303801dca95a9b

Score
10/10
buranpersistenceransomware

Malware Config

Extracted

Path

C:\!!! ALL YOUR FILES ARE ENCRYPTED !!!.TXT

Family

buran

Ransom Note
!!! ALL YOUR FILES ARE ENCRYPTED !!! All your files, documents, photos, databases and other important files are encrypted. You are not able to decrypt it by yourself! The only method of recovering files is to purchase an unique private key. Only we can give you this key and only we can recover your files. To be sure we have the decryptor and it works you can send an email: [email protected] and decrypt one file for free. But this file should be of not valuable! Do you really want to restore your files? Write to email: [email protected] Reserved email: [email protected] Reserved email: [email protected] Your personal ID: E48-015-FD5 Attention! * Do not rename encrypted files. * Do not try to decrypt your data using third party software, it may cause permanent data loss. * Decryption of your files with the help of third parties may cause increased price (they add their fee to our) or you can become a victim of a scam.

Signatures

  • Buran

    Ransomware-as-a-service based on the VegaLocker family first identified in 2019.

    ransomwareburan
  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

    ransomware
  • Executes dropped EXE 3 IoCs
  • Modifies extensions of user files 1 IoCs

    Ransomware generally changes the extension on encrypted files.

    ransomware
  • Loads dropped DLL 2 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
    persistence
  • Enumerates connected drives 3 TTPs 24 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • 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 System32 directory 1 IoCs
  • Drops file in Program Files directory 64 IoCs
  • Drops file in Windows directory 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Interacts with shadow copies 2 TTPs 1 IoCs

    Shadow copies are often targeted by ransomware to inhibit system recovery.

    ransomware
  • Modifies system certificate store 2 TTPs 5 IoCs
    evasionspywaretrojan
  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\99ee7cf74c8de999f2a1cc8cefacad3c866a86e78c87a56323729bfad967a4e9.exe
    "C:\Users\Admin\AppData\Local\Temp\99ee7cf74c8de999f2a1cc8cefacad3c866a86e78c87a56323729bfad967a4e9.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1520
    • C:\Users\Public\Videos\hgfdfds.exe
      "C:\Users\Public\Videos\hgfdfds.exe"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Adds Run key to start application
      • Modifies system certificate store
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:792
      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\services.exe
        "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\services.exe" -start
        3⤵
        • Executes dropped EXE
        • Enumerates connected drives
        • Modifies system certificate store
        • Suspicious use of WriteProcessMemory
        PID:1112
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\system32\cmd.exe" /C wmic shadowcopy delete
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:108
          • C:\Windows\SysWOW64\Wbem\WMIC.exe
            wmic shadowcopy delete
            5⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:1932
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\system32\cmd.exe" /C bcdedit /set {default} recoveryenabled no
          4⤵
            PID:1928
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\system32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures
            4⤵
              PID:1148
            • C:\Windows\SysWOW64\cmd.exe
              "C:\Windows\system32\cmd.exe" /C wbadmin delete catalog -quiet
              4⤵
                PID:1724
              • C:\Windows\SysWOW64\cmd.exe
                "C:\Windows\system32\cmd.exe" /C vssadmin delete shadows /all /quiet
                4⤵
                • Suspicious use of WriteProcessMemory
                PID:1596
                • C:\Windows\SysWOW64\vssadmin.exe
                  vssadmin delete shadows /all /quiet
                  5⤵
                  • Interacts with shadow copies
                  PID:1680
              • C:\Windows\SysWOW64\cmd.exe
                "C:\Windows\system32\cmd.exe" /C C:\Users\Admin\AppData\Local\Temp\~temp001.bat
                4⤵
                • Suspicious use of WriteProcessMemory
                PID:1336
                • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
                  powershell.exe -ExecutionPolicy ByPass -Command "Get-WmiObject Win32_Shadowcopy | ForEach-Object {$_.Delete();}"
                  5⤵
                  • Drops file in System32 directory
                  • Suspicious behavior: EnumeratesProcesses
                  • Suspicious use of AdjustPrivilegeToken
                  PID:1900
                • C:\Windows\SysWOW64\Wbem\WMIC.exe
                  WMIC.exe shadowcopy delete /nointeractive
                  5⤵
                  • Suspicious use of AdjustPrivilegeToken
                  PID:1016
              • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\services.exe
                "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\services.exe" -agent 0
                4⤵
                • Executes dropped EXE
                • Modifies extensions of user files
                • Drops file in Program Files directory
                • Drops file in Windows directory
                PID:944
              • C:\Windows\SysWOW64\notepad.exe
                notepad.exe
                4⤵
                  PID:1076
              • C:\Windows\SysWOW64\notepad.exe
                notepad.exe
                3⤵
                  PID:1552
            • C:\Windows\system32\vssvc.exe
              C:\Windows\system32\vssvc.exe
              1⤵
              • Suspicious use of AdjustPrivilegeToken
              PID:528

            Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            • memory/792-58-0x0000000075BA1000-0x0000000075BA3000-memory.dmp

              Filesize

              8KB

              Download

            • memory/1076-127-0x00000000000A0000-0x00000000000A1000-memory.dmp

              Filesize

              4KB

              Download

            • memory/1520-55-0x000007FEFC371000-0x000007FEFC373000-memory.dmp

              Filesize

              8KB

              Download

            • memory/1552-65-0x0000000000080000-0x0000000000081000-memory.dmp

              Filesize

              4KB

              Download

            • memory/1552-72-0x00000000000D0000-0x00000000000D1000-memory.dmp

              Filesize

              4KB

              Download

            • memory/1900-97-0x00000000025C0000-0x000000000320A000-memory.dmp

              Filesize

              12.3MB

              Download

            • memory/1900-98-0x00000000025C0000-0x000000000320A000-memory.dmp

              Filesize

              12.3MB

              Download

            • memory/1900-96-0x00000000025C0000-0x000000000320A000-memory.dmp

              Filesize

              12.3MB

              Download