Analysis

  • max time kernel
    149s
  • max time network
    180s
  • platform
    windows7_x64
  • resource
    win7v20210410
  • submitted
    07/06/2021, 06:00

General

  • Target
    5b5e545fba44f05f1f1d97310e757cbb.exe
  • Size 780KB
  • Sample210607-2f5akj4e9n
  • SHA256 e1e8a656af27befe77fda35ce1a061cafbf6f5f0bff188d1e599db94a17ca3a2
  • MD5 SHA1 SHA512

Malware Config

Extracted

Path
  • C:\_readme.txt

Ransom Note
  • ATTENTION! Don't worry, you can return all your files! All your files like pictures, databases, documents and other important are encrypted with strongest encryption and unique key. The only method of recovering files is to purchase decrypt tool and unique key for you. This software will decrypt all your encrypted files. What guarantees you have? You can send one of your encrypted file from your PC and we decrypt it for free. But we can decrypt only 1 file for free. File must not contain valuable information. You can get and look video overview decrypt tool: https://we.tl/t-TFI08DijHt Price of private key and decrypt software is $980. Discount 50% available if you contact us first 72 hours, that's price for you is $490. Please note that you'll never restore your data without payment. Check your e-mail "Spam" or "Junk" folder if you don't get answer more than 6 hours. To get this software you need write on our e-mail: [email protected] Reserve e-mail address to contact us: [email protected] Your personal ID: 0301ewgfDdMVRPbSnFtySupDwbPHDki6lHhdaU8yRerXrXB00l
URLs
  • https://we.tl/t-TFI08DijHt

Extracted

Family
  • vidar

Version
  • 39.2

Botnet
  • 517

C2
  • https://dimashub.tumblr.com

Attributes
  • profile_id

    517

Signatures

  • Deletes Windows Defender Definitions 2 TTPs 1 IoCs

    Uses mpcmdrun utility to delete all AV definitions.

  • Djvu Ransomware

    Ransomware which is a variant of the STOP family.

  • Vidar

    Vidar is an infostealer based on Arkei stealer.

  • Vidar Stealer 4 IoCs
  • Disables Task Manager via registry modification
  • Downloads MZ/PE file
  • Drops file in Drivers directory 1 IoCs
  • Executes dropped EXE 7 IoCs
  • Modifies extensions of user files 1 IoCs

    Ransomware generally changes the extension on encrypted files.

  • Loads dropped DLL 16 IoCs
  • Modifies file permissions 1 TTPs 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Accesses 2FA software files, possible credential harvesting 2 TTPs
  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Checks installed software on the system 1 TTPs

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

  • Looks up external IP address via web service 5 IoCs

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

  • Suspicious use of SetThreadContext 4 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 2 IoCs

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

  • Delays execution with timeout.exe 1 IoCs
  • Kills process with taskkill 1 IoCs
  • Modifies system certificate store 2 TTPs 5 IoCs
  • Suspicious behavior: EnumeratesProcesses 17 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\5b5e545fba44f05f1f1d97310e757cbb.exe
    "C:\Users\Admin\AppData\Local\Temp\5b5e545fba44f05f1f1d97310e757cbb.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:740
    • C:\Users\Admin\AppData\Local\Temp\5b5e545fba44f05f1f1d97310e757cbb.exe
      "C:\Users\Admin\AppData\Local\Temp\5b5e545fba44f05f1f1d97310e757cbb.exe"
      2⤵
      • Adds Run key to start application
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:1088
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\3400f1a4-6e2c-4c9a-a892-697ca5ad1b81" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:808
      • C:\Users\Admin\AppData\Local\Temp\5b5e545fba44f05f1f1d97310e757cbb.exe
        "C:\Users\Admin\AppData\Local\Temp\5b5e545fba44f05f1f1d97310e757cbb.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1720
        • C:\Users\Admin\AppData\Local\Temp\5b5e545fba44f05f1f1d97310e757cbb.exe
          "C:\Users\Admin\AppData\Local\Temp\5b5e545fba44f05f1f1d97310e757cbb.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Modifies extensions of user files
          • Loads dropped DLL
          • Modifies system certificate store
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:1160
          • C:\Users\Admin\AppData\Local\6476e118-8a47-48c8-8507-659ba4f4e05a\updatewin1.exe
            "C:\Users\Admin\AppData\Local\6476e118-8a47-48c8-8507-659ba4f4e05a\updatewin1.exe"
            5⤵
            • Executes dropped EXE
            • Loads dropped DLL
            • Suspicious use of WriteProcessMemory
            PID:1504
            • C:\Users\Admin\AppData\Local\6476e118-8a47-48c8-8507-659ba4f4e05a\updatewin1.exe
              "C:\Users\Admin\AppData\Local\6476e118-8a47-48c8-8507-659ba4f4e05a\updatewin1.exe" --Admin
              6⤵
              • Executes dropped EXE
              • Loads dropped DLL
              • Suspicious use of WriteProcessMemory
              PID:1312
              • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
                powershell -Command Set-ExecutionPolicy -Scope CurrentUser RemoteSigned
                7⤵
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:1624
              • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
                powershell -NoProfile -ExecutionPolicy Bypass -Command "& {Start-Process PowerShell -ArgumentList '-NoProfile -ExecutionPolicy Bypass -File ""C:\Users\Admin\AppData\Local\script.ps1""' -Verb RunAs}"
                7⤵
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:860
                • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
                  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -NoProfile -ExecutionPolicy Bypass -File "C:\Users\Admin\AppData\Local\script.ps1
                  8⤵
                  • Suspicious behavior: EnumeratesProcesses
                  • Suspicious use of AdjustPrivilegeToken
                  PID:936
              • C:\Program Files\Windows Defender\mpcmdrun.exe
                "C:\Program Files\Windows Defender\mpcmdrun.exe" -removedefinitions -all
                7⤵
                • Deletes Windows Defender Definitions
                PID:1240
              • C:\Windows\SysWOW64\cmd.exe
                cmd /c ""C:\Users\Admin\AppData\Local\Temp\delself.bat""
                7⤵
                  PID:1572
            • C:\Users\Admin\AppData\Local\6476e118-8a47-48c8-8507-659ba4f4e05a\updatewin2.exe
              "C:\Users\Admin\AppData\Local\6476e118-8a47-48c8-8507-659ba4f4e05a\updatewin2.exe"
              5⤵
              • Drops file in Drivers directory
              • Executes dropped EXE
              PID:1280
            • C:\Users\Admin\AppData\Local\6476e118-8a47-48c8-8507-659ba4f4e05a\5.exe
              "C:\Users\Admin\AppData\Local\6476e118-8a47-48c8-8507-659ba4f4e05a\5.exe"
              5⤵
              • Executes dropped EXE
              • Suspicious use of SetThreadContext
              PID:1632
              • C:\Users\Admin\AppData\Local\6476e118-8a47-48c8-8507-659ba4f4e05a\5.exe
                "C:\Users\Admin\AppData\Local\6476e118-8a47-48c8-8507-659ba4f4e05a\5.exe"
                6⤵
                • Executes dropped EXE
                • Loads dropped DLL
                • Checks processor information in registry
                • Suspicious behavior: EnumeratesProcesses
                PID:940
                • C:\Windows\SysWOW64\cmd.exe
                  "C:\Windows\System32\cmd.exe" /c taskkill /im 5.exe /f & timeout /t 6 & del /f /q "C:\Users\Admin\AppData\Local\6476e118-8a47-48c8-8507-659ba4f4e05a\5.exe" & del C:\ProgramData\*.dll & exit
                  7⤵
                    PID:1860
                    • C:\Windows\SysWOW64\taskkill.exe
                      taskkill /im 5.exe /f
                      8⤵
                      • Kills process with taskkill
                      • Suspicious use of AdjustPrivilegeToken
                      PID:2004
                    • C:\Windows\SysWOW64\timeout.exe
                      timeout /t 6
                      8⤵
                      • Delays execution with timeout.exe
                      PID:1392
      • C:\Windows\system32\taskeng.exe
        taskeng.exe {FD2B7C0E-C3F4-451E-8DB0-2DF742AFC179} S-1-5-21-2513283230-931923277-594887482-1000:MRBKYMNO\Admin:Interactive:[1]
        1⤵
          PID:1728
          • C:\Users\Admin\AppData\Local\3400f1a4-6e2c-4c9a-a892-697ca5ad1b81\5b5e545fba44f05f1f1d97310e757cbb.exe
            C:\Users\Admin\AppData\Local\3400f1a4-6e2c-4c9a-a892-697ca5ad1b81\5b5e545fba44f05f1f1d97310e757cbb.exe --Task
            2⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            PID:1632
            • C:\Users\Admin\AppData\Local\3400f1a4-6e2c-4c9a-a892-697ca5ad1b81\5b5e545fba44f05f1f1d97310e757cbb.exe
              C:\Users\Admin\AppData\Local\3400f1a4-6e2c-4c9a-a892-697ca5ad1b81\5b5e545fba44f05f1f1d97310e757cbb.exe --Task
              3⤵
              • Executes dropped EXE
              • Suspicious behavior: EnumeratesProcesses
              PID:1004

        Network

              MITRE ATT&CK Enterprise v6

              Replay Monitor

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              Downloads

              memory/740-63-0x0000000001E10000-0x0000000001F2B000-memory.dmp

              memory/860-132-0x0000000004AB0000-0x0000000004AB1000-memory.dmp

              memory/860-143-0x0000000005850000-0x0000000005851000-memory.dmp

              memory/860-135-0x0000000005420000-0x0000000005421000-memory.dmp

              memory/860-134-0x0000000004AB2000-0x0000000004AB3000-memory.dmp

              memory/860-133-0x0000000004A60000-0x0000000004A61000-memory.dmp

              memory/860-131-0x0000000004AF0000-0x0000000004AF1000-memory.dmp

              memory/860-130-0x0000000002370000-0x0000000002371000-memory.dmp

              memory/936-166-0x00000000059F0000-0x00000000059F1000-memory.dmp

              memory/936-148-0x00000000025A0000-0x00000000025A1000-memory.dmp

              memory/936-180-0x00000000064F0000-0x00000000064F1000-memory.dmp

              memory/936-152-0x0000000004820000-0x0000000004821000-memory.dmp

              memory/936-179-0x00000000064A0000-0x00000000064A1000-memory.dmp

              memory/936-154-0x0000000005420000-0x0000000005421000-memory.dmp

              memory/936-156-0x0000000004892000-0x0000000004893000-memory.dmp

              memory/936-155-0x0000000004890000-0x0000000004891000-memory.dmp

              memory/936-163-0x0000000005860000-0x0000000005861000-memory.dmp

              memory/940-187-0x0000000000400000-0x000000000049A000-memory.dmp

              memory/940-182-0x0000000000400000-0x000000000049A000-memory.dmp

              memory/1004-208-0x0000000000400000-0x0000000000537000-memory.dmp

              memory/1088-64-0x0000000000400000-0x0000000000537000-memory.dmp

              memory/1088-60-0x0000000000400000-0x0000000000537000-memory.dmp

              memory/1088-62-0x00000000757E1000-0x00000000757E3000-memory.dmp

              memory/1160-78-0x0000000000400000-0x0000000000537000-memory.dmp

              memory/1280-109-0x0000000000400000-0x000000000044D000-memory.dmp

              memory/1312-98-0x0000000000400000-0x000000000044D000-memory.dmp

              memory/1504-97-0x0000000000400000-0x000000000044D000-memory.dmp

              memory/1624-102-0x00000000025F0000-0x00000000025F1000-memory.dmp

              memory/1624-103-0x0000000004962000-0x0000000004963000-memory.dmp

              memory/1624-119-0x0000000006330000-0x0000000006331000-memory.dmp

              memory/1624-100-0x0000000000640000-0x0000000000641000-memory.dmp

              memory/1624-126-0x00000000062D0000-0x00000000062D1000-memory.dmp

              memory/1624-118-0x0000000006170000-0x0000000006171000-memory.dmp

              memory/1624-99-0x0000000004960000-0x0000000004961000-memory.dmp

              memory/1624-101-0x00000000049A0000-0x00000000049A1000-memory.dmp

              memory/1624-108-0x0000000005360000-0x0000000005361000-memory.dmp

              memory/1624-112-0x0000000006130000-0x0000000006131000-memory.dmp

              memory/1624-114-0x000000007EF30000-0x000000007EF31000-memory.dmp

              memory/1632-186-0x00000000002A0000-0x0000000000337000-memory.dmp