Analysis

  • max time kernel
    112s
  • max time network
    127s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • submitted
    05/05/2021, 15:21

General

  • Target
    1c55f4476051bb671dbf5a2158fe5d78.exe
  • Size 831KB
  • Sample210505-qsadfv2vw6
  • SHA256 c5ed16a495c5efbbf19918adfe4a954decc118b18691f38741d12d4f465948a5
  • MD5 SHA1 SHA512

Malware Config

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.

  • Disables Task Manager via registry modification
  • Downloads MZ/PE file
  • Drops file in Drivers directory 1 IoCs
  • Executes dropped EXE 4 IoCs
  • Loads dropped DLL 2 IoCs
  • Modifies file permissions 1 TTPs 1 IoCs
  • Reads local data of messenger clients 2 TTPs

    Infostealers often target stored data of messaging applications, which can include saved credentials and account information.

  • 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.

  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 14 IoCs
  • 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 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 20 IoCs
  • Suspicious use of WriteProcessMemory 41 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\1c55f4476051bb671dbf5a2158fe5d78.exe
    "C:\Users\Admin\AppData\Local\Temp\1c55f4476051bb671dbf5a2158fe5d78.exe"
    1⤵
    • Adds Run key to start application
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:1000
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\Users\Admin\AppData\Local\a1f146d4-20fa-493f-bde1-94d1d5ee622f" /deny *S-1-1-0:(OI)(CI)(DE,DC)
      2⤵
      • Modifies file permissions
      PID:2608
    • C:\Users\Admin\AppData\Local\Temp\1c55f4476051bb671dbf5a2158fe5d78.exe
      "C:\Users\Admin\AppData\Local\Temp\1c55f4476051bb671dbf5a2158fe5d78.exe" --Admin IsNotAutoStart IsNotTask
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:2336
      • C:\Users\Admin\AppData\Local\87a16454-5772-408f-a1f1-46ddf834635a\updatewin1.exe
        "C:\Users\Admin\AppData\Local\87a16454-5772-408f-a1f1-46ddf834635a\updatewin1.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of WriteProcessMemory
        PID:496
        • C:\Users\Admin\AppData\Local\87a16454-5772-408f-a1f1-46ddf834635a\updatewin1.exe
          "C:\Users\Admin\AppData\Local\87a16454-5772-408f-a1f1-46ddf834635a\updatewin1.exe" --Admin
          4⤵
          • Executes dropped EXE
          • Suspicious use of WriteProcessMemory
          PID:3620
          • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
            powershell -Command Set-ExecutionPolicy -Scope CurrentUser RemoteSigned
            5⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:368
          • 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}"
            5⤵
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of WriteProcessMemory
            PID:1760
            • 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
              6⤵
              • Suspicious use of AdjustPrivilegeToken
              PID:4000
          • C:\Program Files\Windows Defender\mpcmdrun.exe
            "C:\Program Files\Windows Defender\mpcmdrun.exe" -removedefinitions -all
            5⤵
            • Deletes Windows Defender Definitions
            PID:424
          • C:\Windows\SysWOW64\cmd.exe
            C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\delself.bat""
            5⤵
              PID:2480
        • C:\Users\Admin\AppData\Local\87a16454-5772-408f-a1f1-46ddf834635a\updatewin2.exe
          "C:\Users\Admin\AppData\Local\87a16454-5772-408f-a1f1-46ddf834635a\updatewin2.exe"
          3⤵
          • Drops file in Drivers directory
          • Executes dropped EXE
          PID:392
        • C:\Users\Admin\AppData\Local\87a16454-5772-408f-a1f1-46ddf834635a\5.exe
          "C:\Users\Admin\AppData\Local\87a16454-5772-408f-a1f1-46ddf834635a\5.exe"
          3⤵
          • Executes dropped EXE
          • Loads dropped DLL
          • Checks processor information in registry
          • Suspicious use of WriteProcessMemory
          PID:2548
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2548 -s 836
            4⤵
            • Program crash
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:3556
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2548 -s 916
            4⤵
            • Program crash
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:2884
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2548 -s 1076
            4⤵
            • Program crash
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:2300
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2548 -s 1080
            4⤵
            • Program crash
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:2648
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2548 -s 1088
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:3548
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2548 -s 1112
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:1220
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2548 -s 1404
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:580
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2548 -s 1448
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:2692
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2548 -s 1436
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:2728
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2548 -s 1456
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:3520
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2548 -s 1416
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:2332
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2548 -s 1700
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:2396
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2548 -s 1712
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:2544
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2548 -s 1824
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:2520
          • 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\87a16454-5772-408f-a1f1-46ddf834635a\5.exe" & del C:\ProgramData\*.dll & exit
            4⤵
            • Suspicious use of WriteProcessMemory
            PID:412
            • C:\Windows\SysWOW64\taskkill.exe
              taskkill /im 5.exe /f
              5⤵
              • Kills process with taskkill
              • Suspicious use of AdjustPrivilegeToken
              PID:900
            • C:\Windows\SysWOW64\timeout.exe
              timeout /t 6
              5⤵
              • Delays execution with timeout.exe
              PID:496

    Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          memory/368-153-0x00000000074C0000-0x00000000074C1000-memory.dmp

          memory/368-157-0x0000000008140000-0x0000000008141000-memory.dmp

          memory/368-224-0x0000000004AD6000-0x0000000004AD8000-memory.dmp

          memory/368-181-0x0000000009870000-0x0000000009871000-memory.dmp

          memory/368-180-0x0000000009450000-0x0000000009451000-memory.dmp

          memory/368-179-0x000000007EB70000-0x000000007EB71000-memory.dmp

          memory/368-149-0x0000000004A30000-0x0000000004A31000-memory.dmp

          memory/368-150-0x00000000075E0000-0x00000000075E1000-memory.dmp

          memory/368-152-0x0000000004AD2000-0x0000000004AD3000-memory.dmp

          memory/368-151-0x0000000004AD0000-0x0000000004AD1000-memory.dmp

          memory/368-174-0x00000000092E0000-0x00000000092E1000-memory.dmp

          memory/368-154-0x0000000007D80000-0x0000000007D81000-memory.dmp

          memory/368-155-0x0000000007560000-0x0000000007561000-memory.dmp

          memory/368-156-0x0000000007DF0000-0x0000000007DF1000-memory.dmp

          memory/368-220-0x0000000004AD3000-0x0000000004AD4000-memory.dmp

          memory/368-158-0x00000000087B0000-0x00000000087B1000-memory.dmp

          memory/368-159-0x0000000008590000-0x0000000008591000-memory.dmp

          memory/368-167-0x0000000009300000-0x0000000009333000-memory.dmp

          memory/392-141-0x0000000000400000-0x000000000044D000-memory.dmp

          memory/496-140-0x0000000000400000-0x000000000044D000-memory.dmp

          memory/1000-114-0x00000000026A0000-0x00000000027BA000-memory.dmp

          memory/1000-115-0x0000000000400000-0x00000000008C8000-memory.dmp

          memory/1760-225-0x0000000007330000-0x0000000007331000-memory.dmp

          memory/1760-232-0x0000000007333000-0x0000000007334000-memory.dmp

          memory/1760-226-0x0000000007332000-0x0000000007333000-memory.dmp

          memory/2336-124-0x0000000000400000-0x00000000008C8000-memory.dmp

          memory/2548-135-0x0000000000400000-0x00000000004B4000-memory.dmp

          memory/2548-134-0x0000000002170000-0x0000000002207000-memory.dmp

          memory/3620-145-0x0000000000400000-0x000000000044D000-memory.dmp

          memory/4000-233-0x00000000010F0000-0x00000000010F1000-memory.dmp

          memory/4000-234-0x00000000010F2000-0x00000000010F3000-memory.dmp

          memory/4000-236-0x000000007EF70000-0x000000007EF71000-memory.dmp

          memory/4000-237-0x00000000010F3000-0x00000000010F4000-memory.dmp