Resubmissions

04-06-2021 01:54

210604-q1mqz6zlf2 10

03-06-2021 12:45

210603-5fgyg6535j 10

Analysis

  • max time kernel
    67s
  • max time network
    128s
  • platform
    windows10_x64
  • resource
    win10v20210410
  • submitted
    03-06-2021 12:45

General

  • Target

    570fbe91fdd6d1eb8cfd2f03c032cdde.exe

  • Size

    872KB

  • MD5

    570fbe91fdd6d1eb8cfd2f03c032cdde

  • SHA1

    59d07617c682fed330d82b1d97f1bf32c30c6ff1

  • SHA256

    b4a1845a21726b4826eb4157114d424c9a0f1c3112f67f587cbea352dd33ac61

  • SHA512

    e0cd9f67e26140b22dbcee760b0690e5dd2bb0242091d3c759c123789c6b2bb8abbf1c2a80d6b4e1b00f9097f4f782ba2035041c92afc2280dd75a9dc21f7fb6

Malware Config

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 3 IoCs
  • Disables Task Manager via registry modification
  • Downloads MZ/PE file
  • Drops file in Drivers directory 1 IoCs
  • Executes dropped EXE 5 IoCs
  • Loads dropped DLL 2 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 3 IoCs

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

  • Suspicious use of SetThreadContext 3 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 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 22 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\570fbe91fdd6d1eb8cfd2f03c032cdde.exe
    "C:\Users\Admin\AppData\Local\Temp\570fbe91fdd6d1eb8cfd2f03c032cdde.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:3424
    • C:\Users\Admin\AppData\Local\Temp\570fbe91fdd6d1eb8cfd2f03c032cdde.exe
      "C:\Users\Admin\AppData\Local\Temp\570fbe91fdd6d1eb8cfd2f03c032cdde.exe"
      2⤵
      • Adds Run key to start application
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:208
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\0a653335-a83d-4f1b-a6e0-1cc0ba591765" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:1872
      • C:\Users\Admin\AppData\Local\Temp\570fbe91fdd6d1eb8cfd2f03c032cdde.exe
        "C:\Users\Admin\AppData\Local\Temp\570fbe91fdd6d1eb8cfd2f03c032cdde.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3632
        • C:\Users\Admin\AppData\Local\Temp\570fbe91fdd6d1eb8cfd2f03c032cdde.exe
          "C:\Users\Admin\AppData\Local\Temp\570fbe91fdd6d1eb8cfd2f03c032cdde.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:3400
          • C:\Users\Admin\AppData\Local\2cb9cc0c-ee13-490c-b5ba-09418553742a\updatewin1.exe
            "C:\Users\Admin\AppData\Local\2cb9cc0c-ee13-490c-b5ba-09418553742a\updatewin1.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of WriteProcessMemory
            PID:1556
            • C:\Users\Admin\AppData\Local\2cb9cc0c-ee13-490c-b5ba-09418553742a\updatewin1.exe
              "C:\Users\Admin\AppData\Local\2cb9cc0c-ee13-490c-b5ba-09418553742a\updatewin1.exe" --Admin
              6⤵
              • Executes dropped EXE
              • Suspicious use of WriteProcessMemory
              PID:2780
              • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
                powershell -Command Set-ExecutionPolicy -Scope CurrentUser RemoteSigned
                7⤵
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:2140
              • 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
                • Suspicious use of WriteProcessMemory
                PID:2176
                • 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:4028
              • C:\Program Files\Windows Defender\mpcmdrun.exe
                "C:\Program Files\Windows Defender\mpcmdrun.exe" -removedefinitions -all
                7⤵
                • Deletes Windows Defender Definitions
                PID:4064
              • C:\Windows\SysWOW64\cmd.exe
                C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\delself.bat""
                7⤵
                  PID:2412
            • C:\Users\Admin\AppData\Local\2cb9cc0c-ee13-490c-b5ba-09418553742a\updatewin2.exe
              "C:\Users\Admin\AppData\Local\2cb9cc0c-ee13-490c-b5ba-09418553742a\updatewin2.exe"
              5⤵
              • Drops file in Drivers directory
              • Executes dropped EXE
              PID:2612
            • C:\Users\Admin\AppData\Local\2cb9cc0c-ee13-490c-b5ba-09418553742a\5.exe
              "C:\Users\Admin\AppData\Local\2cb9cc0c-ee13-490c-b5ba-09418553742a\5.exe"
              5⤵
              • Executes dropped EXE
              • Suspicious use of SetThreadContext
              • Suspicious use of WriteProcessMemory
              PID:1168
              • C:\Users\Admin\AppData\Local\2cb9cc0c-ee13-490c-b5ba-09418553742a\5.exe
                "C:\Users\Admin\AppData\Local\2cb9cc0c-ee13-490c-b5ba-09418553742a\5.exe"
                6⤵
                • Executes dropped EXE
                • Loads dropped DLL
                • Checks processor information in registry
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of WriteProcessMemory
                PID:488
                • 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\2cb9cc0c-ee13-490c-b5ba-09418553742a\5.exe" & del C:\ProgramData\*.dll & exit
                  7⤵
                  • Suspicious use of WriteProcessMemory
                  PID:3872
                  • C:\Windows\SysWOW64\taskkill.exe
                    taskkill /im 5.exe /f
                    8⤵
                    • Kills process with taskkill
                    • Suspicious use of AdjustPrivilegeToken
                    PID:216
                  • C:\Windows\SysWOW64\timeout.exe
                    timeout /t 6
                    8⤵
                    • Delays execution with timeout.exe
                    PID:2408

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • memory/208-117-0x0000000000400000-0x0000000000537000-memory.dmp

      Filesize

      1.2MB

    • memory/208-114-0x0000000000400000-0x0000000000537000-memory.dmp

      Filesize

      1.2MB

    • memory/488-157-0x0000000000400000-0x000000000049A000-memory.dmp

      Filesize

      616KB

    • memory/488-161-0x0000000000400000-0x000000000049A000-memory.dmp

      Filesize

      616KB

    • memory/1168-160-0x0000000000580000-0x00000000006CA000-memory.dmp

      Filesize

      1.3MB

    • memory/1556-137-0x0000000000400000-0x000000000044D000-memory.dmp

      Filesize

      308KB

    • memory/2140-155-0x0000000006D72000-0x0000000006D73000-memory.dmp

      Filesize

      4KB

    • memory/2140-156-0x0000000008590000-0x0000000008591000-memory.dmp

      Filesize

      4KB

    • memory/2140-152-0x0000000007CA0000-0x0000000007CA1000-memory.dmp

      Filesize

      4KB

    • memory/2140-153-0x0000000006D70000-0x0000000006D71000-memory.dmp

      Filesize

      4KB

    • memory/2140-154-0x0000000008270000-0x0000000008271000-memory.dmp

      Filesize

      4KB

    • memory/2140-151-0x0000000007E60000-0x0000000007E61000-memory.dmp

      Filesize

      4KB

    • memory/2140-169-0x00000000094B0000-0x00000000094E3000-memory.dmp

      Filesize

      204KB

    • memory/2140-170-0x000000007EA70000-0x000000007EA71000-memory.dmp

      Filesize

      4KB

    • memory/2140-177-0x0000000009470000-0x0000000009471000-memory.dmp

      Filesize

      4KB

    • memory/2140-182-0x00000000095E0000-0x00000000095E1000-memory.dmp

      Filesize

      4KB

    • memory/2140-183-0x00000000097A0000-0x00000000097A1000-memory.dmp

      Filesize

      4KB

    • memory/2140-150-0x0000000007DF0000-0x0000000007DF1000-memory.dmp

      Filesize

      4KB

    • memory/2140-149-0x0000000007D10000-0x0000000007D11000-memory.dmp

      Filesize

      4KB

    • memory/2140-216-0x0000000006D73000-0x0000000006D74000-memory.dmp

      Filesize

      4KB

    • memory/2140-217-0x0000000006D76000-0x0000000006D78000-memory.dmp

      Filesize

      8KB

    • memory/2140-146-0x0000000006D80000-0x0000000006D81000-memory.dmp

      Filesize

      4KB

    • memory/2140-147-0x00000000073F0000-0x00000000073F1000-memory.dmp

      Filesize

      4KB

    • memory/2140-148-0x0000000007A90000-0x0000000007A91000-memory.dmp

      Filesize

      4KB

    • memory/2176-221-0x0000000006CE3000-0x0000000006CE4000-memory.dmp

      Filesize

      4KB

    • memory/2176-219-0x0000000006CE2000-0x0000000006CE3000-memory.dmp

      Filesize

      4KB

    • memory/2176-218-0x0000000006CE0000-0x0000000006CE1000-memory.dmp

      Filesize

      4KB

    • memory/2612-141-0x0000000000400000-0x000000000044D000-memory.dmp

      Filesize

      308KB

    • memory/2780-143-0x0000000000400000-0x000000000044D000-memory.dmp

      Filesize

      308KB

    • memory/3400-128-0x0000000000400000-0x0000000000537000-memory.dmp

      Filesize

      1.2MB

    • memory/3424-116-0x0000000002330000-0x000000000244B000-memory.dmp

      Filesize

      1.1MB

    • memory/4028-230-0x0000000004D73000-0x0000000004D74000-memory.dmp

      Filesize

      4KB

    • memory/4028-228-0x0000000004D72000-0x0000000004D73000-memory.dmp

      Filesize

      4KB

    • memory/4028-227-0x0000000004D70000-0x0000000004D71000-memory.dmp

      Filesize

      4KB

    • memory/4028-229-0x000000007EF10000-0x000000007EF11000-memory.dmp

      Filesize

      4KB