Resubmissions

04-06-2021 01:54

210604-q1mqz6zlf2 10

03-06-2021 12:45

210603-5fgyg6535j 10

Analysis

  • max time kernel
    122s
  • max time network
    124s
  • platform
    windows7_x64
  • resource
    win7v20210410
  • 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 4 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 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 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 5 IoCs
  • Suspicious behavior: EnumeratesProcesses 14 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:1888
    • 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:1616
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\fc8ee91c-cf80-4928-97b3-d8e2faeb6b0f" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:1052
      • 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:1172
        • C:\Users\Admin\AppData\Local\Temp\570fbe91fdd6d1eb8cfd2f03c032cdde.exe
          "C:\Users\Admin\AppData\Local\Temp\570fbe91fdd6d1eb8cfd2f03c032cdde.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Loads dropped DLL
          • Modifies system certificate store
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:1804
          • C:\Users\Admin\AppData\Local\bd3e74f3-f586-4fd4-91fe-1ada3658dd28\updatewin1.exe
            "C:\Users\Admin\AppData\Local\bd3e74f3-f586-4fd4-91fe-1ada3658dd28\updatewin1.exe"
            5⤵
            • Executes dropped EXE
            • Loads dropped DLL
            • Suspicious use of WriteProcessMemory
            PID:2032
            • C:\Users\Admin\AppData\Local\bd3e74f3-f586-4fd4-91fe-1ada3658dd28\updatewin1.exe
              "C:\Users\Admin\AppData\Local\bd3e74f3-f586-4fd4-91fe-1ada3658dd28\updatewin1.exe" --Admin
              6⤵
              • Executes dropped EXE
              • Loads dropped DLL
              • Suspicious use of WriteProcessMemory
              PID:1164
              • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
                powershell -Command Set-ExecutionPolicy -Scope CurrentUser RemoteSigned
                7⤵
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:784
              • 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:1756
                • 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:1440
              • C:\Program Files\Windows Defender\mpcmdrun.exe
                "C:\Program Files\Windows Defender\mpcmdrun.exe" -removedefinitions -all
                7⤵
                • Deletes Windows Defender Definitions
                PID:916
              • C:\Windows\SysWOW64\cmd.exe
                cmd /c ""C:\Users\Admin\AppData\Local\Temp\delself.bat""
                7⤵
                  PID:740
            • C:\Users\Admin\AppData\Local\bd3e74f3-f586-4fd4-91fe-1ada3658dd28\updatewin2.exe
              "C:\Users\Admin\AppData\Local\bd3e74f3-f586-4fd4-91fe-1ada3658dd28\updatewin2.exe"
              5⤵
              • Drops file in Drivers directory
              • Executes dropped EXE
              PID:1096
            • C:\Users\Admin\AppData\Local\bd3e74f3-f586-4fd4-91fe-1ada3658dd28\5.exe
              "C:\Users\Admin\AppData\Local\bd3e74f3-f586-4fd4-91fe-1ada3658dd28\5.exe"
              5⤵
              • Executes dropped EXE
              • Suspicious use of SetThreadContext
              PID:304
              • C:\Users\Admin\AppData\Local\bd3e74f3-f586-4fd4-91fe-1ada3658dd28\5.exe
                "C:\Users\Admin\AppData\Local\bd3e74f3-f586-4fd4-91fe-1ada3658dd28\5.exe"
                6⤵
                • Executes dropped EXE
                • Loads dropped DLL
                • Checks processor information in registry
                • Suspicious behavior: EnumeratesProcesses
                PID:1276
                • 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\bd3e74f3-f586-4fd4-91fe-1ada3658dd28\5.exe" & del C:\ProgramData\*.dll & exit
                  7⤵
                    PID:1592
                    • C:\Windows\SysWOW64\taskkill.exe
                      taskkill /im 5.exe /f
                      8⤵
                      • Kills process with taskkill
                      • Suspicious use of AdjustPrivilegeToken
                      PID:840
                    • C:\Windows\SysWOW64\timeout.exe
                      timeout /t 6
                      8⤵
                      • Delays execution with timeout.exe
                      PID:1512

      Network

      MITRE ATT&CK Enterprise v6

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • memory/304-186-0x0000000000220000-0x00000000002B7000-memory.dmp

        Filesize

        604KB

      • memory/784-126-0x00000000062A0000-0x00000000062A1000-memory.dmp

        Filesize

        4KB

      • memory/784-99-0x00000000004E0000-0x00000000004E1000-memory.dmp

        Filesize

        4KB

      • memory/784-118-0x000000007EF30000-0x000000007EF31000-memory.dmp

        Filesize

        4KB

      • memory/784-117-0x00000000057D0000-0x00000000057D1000-memory.dmp

        Filesize

        4KB

      • memory/784-112-0x0000000005730000-0x0000000005731000-memory.dmp

        Filesize

        4KB

      • memory/784-119-0x0000000006350000-0x0000000006351000-memory.dmp

        Filesize

        4KB

      • memory/784-109-0x0000000005360000-0x0000000005361000-memory.dmp

        Filesize

        4KB

      • memory/784-108-0x0000000005280000-0x0000000005281000-memory.dmp

        Filesize

        4KB

      • memory/784-105-0x0000000004720000-0x0000000004721000-memory.dmp

        Filesize

        4KB

      • memory/784-100-0x00000000047A0000-0x00000000047A1000-memory.dmp

        Filesize

        4KB

      • memory/784-106-0x0000000004722000-0x0000000004723000-memory.dmp

        Filesize

        4KB

      • memory/1096-107-0x0000000000400000-0x000000000044D000-memory.dmp

        Filesize

        308KB

      • memory/1164-98-0x0000000000400000-0x000000000044D000-memory.dmp

        Filesize

        308KB

      • memory/1276-187-0x0000000000400000-0x000000000049A000-memory.dmp

        Filesize

        616KB

      • memory/1276-182-0x0000000000400000-0x000000000049A000-memory.dmp

        Filesize

        616KB

      • memory/1440-157-0x0000000004C92000-0x0000000004C93000-memory.dmp

        Filesize

        4KB

      • memory/1440-151-0x0000000000790000-0x0000000000791000-memory.dmp

        Filesize

        4KB

      • memory/1440-154-0x00000000026F0000-0x00000000026F1000-memory.dmp

        Filesize

        4KB

      • memory/1440-163-0x0000000005920000-0x0000000005921000-memory.dmp

        Filesize

        4KB

      • memory/1440-166-0x00000000059D0000-0x00000000059D1000-memory.dmp

        Filesize

        4KB

      • memory/1440-167-0x000000007EF20000-0x000000007EF21000-memory.dmp

        Filesize

        4KB

      • memory/1440-179-0x0000000006560000-0x0000000006561000-memory.dmp

        Filesize

        4KB

      • memory/1440-180-0x0000000006570000-0x0000000006571000-memory.dmp

        Filesize

        4KB

      • memory/1440-156-0x0000000004C90000-0x0000000004C91000-memory.dmp

        Filesize

        4KB

      • memory/1440-155-0x00000000029F0000-0x00000000029F1000-memory.dmp

        Filesize

        4KB

      • memory/1616-64-0x0000000000400000-0x0000000000537000-memory.dmp

        Filesize

        1.2MB

      • memory/1616-60-0x0000000000400000-0x0000000000537000-memory.dmp

        Filesize

        1.2MB

      • memory/1616-62-0x0000000075161000-0x0000000075163000-memory.dmp

        Filesize

        8KB

      • memory/1756-131-0x0000000004970000-0x0000000004971000-memory.dmp

        Filesize

        4KB

      • memory/1756-147-0x00000000058F0000-0x00000000058F1000-memory.dmp

        Filesize

        4KB

      • memory/1756-134-0x0000000000C72000-0x0000000000C73000-memory.dmp

        Filesize

        4KB

      • memory/1756-130-0x00000000025C0000-0x00000000025C1000-memory.dmp

        Filesize

        4KB

      • memory/1756-132-0x00000000027E0000-0x00000000027E1000-memory.dmp

        Filesize

        4KB

      • memory/1756-135-0x0000000005420000-0x0000000005421000-memory.dmp

        Filesize

        4KB

      • memory/1756-133-0x0000000000C70000-0x0000000000C71000-memory.dmp

        Filesize

        4KB

      • memory/1804-72-0x0000000000400000-0x0000000000537000-memory.dmp

        Filesize

        1.2MB

      • memory/1888-63-0x0000000001E70000-0x0000000001F8B000-memory.dmp

        Filesize

        1.1MB

      • memory/2032-97-0x0000000000400000-0x000000000044D000-memory.dmp

        Filesize

        308KB