Overview

overview

10

Static

static

3

sex.exe

windows7-x64

10

sex.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    119s
  • max time network
    125s
  • platform
    windows7_x64
  • resource
    win7-20240729-en
  • resource tags

    arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
  • submitted
    29-12-2024 00:23

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General

  • Target

    sex.exe

  • Size

    3.2MB

  • MD5

    9e85a92de58c89babecf27e74f85d3f4

  • SHA1

    d955b86d566325a2ac8960b45c2cf336ddac4717

  • SHA256

    4b0f1abf2abfd7a9a291425227844bf98b3aa0ac499268b52f69f297bda90839

  • SHA512

    84e094d097ed6ac187d7d301d6a772ca59cfebc829e63cca70685d7176111a3afbad4ff4908932b0ec436a34a302fd53a4fce97aeda126796daab5b130fc72d9

  • SSDEEP

    24576:8SUpZr3y2amHY6MdefqTXeZty61kSSTKa7WsUS2VSs+stModjGdbzfDUBB355zs/:oZat81wua7bUScTLTXO+2NwL5ljasaU

Score
10/10
avoslockerdefense_evasiondiscoveryevasionexecutionimpactransomwareupx

Malware Config

Signatures

  • Avoslocker Ransomware

    Avoslocker is a relatively new ransomware, that was observed in late June and early July, 2021.

    ransomwareavoslocker
  • Avoslocker family
    avoslocker
  • Deletes shadow copies 3 TTPs

    Ransomware often targets backup files to inhibit system recovery.

    ransomwaredefense_evasionimpactexecution
  • Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs
    ransomwareevasion
  • Renames multiple (10416) files with added filename extension

    This suggests ransomware activity of encrypting all the files on the system.

    ransomware
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 1 IoCs
  • Drops desktop.ini file(s) 1 IoCs
  • Enumerates connected drives 3 TTPs 1 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Sets desktop wallpaper using registry 2 TTPs 1 IoCs
    ransomware
  • UPX packed file 3 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

    upx
  • Drops file in Program Files directory 64 IoCs
  • Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

    Using powershell.exe command.

    execution
  • System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

    discovery
  • Interacts with shadow copies 3 TTPs 1 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 52 IoCs
  • Uses Volume Shadow Copy service COM API

    The Volume Shadow Copy service is used to manage backups/snapshots.

    ransomware

Processes

  • C:\Users\Admin\AppData\Local\Temp\sex.exe
    "C:\Users\Admin\AppData\Local\Temp\sex.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of WriteProcessMemory
    PID:2088
    • C:\Users\Admin\AppData\Local\Temp\hack.exe
      "C:\Users\Admin\AppData\Local\Temp\hack.exe"
      2⤵
      • Executes dropped EXE
      • Drops desktop.ini file(s)
      • Enumerates connected drives
      • Drops file in Program Files directory
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1996
      • C:\Windows\system32\cmd.exe
        cmd /c wmic shadowcopy delete /nointeractive
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2304
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete /nointeractive
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:1152
      • C:\Windows\system32\cmd.exe
        cmd /c vssadmin.exe Delete Shadows /All /Quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1688
        • C:\Windows\system32\vssadmin.exe
          vssadmin.exe Delete Shadows /All /Quiet
          4⤵
          • Interacts with shadow copies
          PID:1952
      • C:\Windows\system32\cmd.exe
        cmd /c bcdedit /set {default} recoveryenabled No
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2408
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled No
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:1492
      • C:\Windows\system32\cmd.exe
        cmd /c bcdedit /set {default} bootstatuspolicy ignoreallfailures
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1196
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:1328
      • C:\Windows\system32\cmd.exe
        cmd /c powershell -command "Get-EventLog -LogName * | ForEach { Clear-EventLog $_.Log }"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2080
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          powershell -command "Get-EventLog -LogName * | ForEach { Clear-EventLog $_.Log }"
          4⤵
          • Command and Scripting Interpreter: PowerShell
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:2820
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        powershell -Command "$a = [System.IO.File]::ReadAllText(\"F:\GET_YOUR_FILES_BACK.txt\");Add-Type -AssemblyName System.Drawing;$filename = \"$env:temp\$(Get-Random).png\";$bmp = new-object System.Drawing.Bitmap 1920,1080;$font = new-object System.Drawing.Font Consolas,10;$brushBg = [System.Drawing.Brushes]::Black;$brushFg = [System.Drawing.Brushes]::White;$format = [System.Drawing.StringFormat]::GenericDefault;$format.Alignment = [System.Drawing.StringAlignment]::Center;$format.LineAlignment = [System.Drawing.StringAlignment]::Center;$graphics = [System.Drawing.Graphics]::FromImage($bmp);$graphics.FillRectangle($brushBg,0,0,$bmp.Width,$bmp.Height);$graphics.DrawString($a,$font,$brushFg,[System.Drawing.RectangleF]::FromLTRB(0, 0, 1920, 1080),$format);$graphics.Dispose();$bmp.Save($filename);reg add \"HKEY_CURRENT_USER\Control Panel\Desktop\" /v Wallpaper /t REG_SZ /d $filename /f;Start-Sleep 1;rundll32.exe user32.dll, UpdatePerUserSystemParameters, 0, $false;"
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:4088
        • C:\Windows\system32\reg.exe
          "C:\Windows\system32\reg.exe" add "HKEY_CURRENT_USER\Control Panel\Desktop" /v Wallpaper /t REG_SZ /d C:\Users\Admin\AppData\Local\Temp\1928590608.png /f
          4⤵
          • Sets desktop wallpaper using registry
          PID:3716
        • C:\Windows\system32\rundll32.exe
          "C:\Windows\system32\rundll32.exe" user32.dll UpdatePerUserSystemParameters 0 False
          4⤵
            PID:2092
      • C:\Users\Admin\AppData\Local\Temp\rufus-4.6p.exe
        "C:\Users\Admin\AppData\Local\Temp\rufus-4.6p.exe"
        2⤵
        • Executes dropped EXE
        PID:1488
    • C:\Windows\system32\vssvc.exe
      C:\Windows\system32\vssvc.exe
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2144

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\Temp\hack.exe
      Filesize

      807KB

      MD5

      e27b5291c8fb2dfdeb7f16bb6851df5e

      SHA1

      40207f83b601cd60905c1f807ac0889c80dfe33f

      SHA256

      ffd933ad53f22a0f10cceb4986087258f72dffdd36999b7014c6b37c157ee45f

      SHA512

      2ddbc50cd780ffbf73c354b9b437322eb49cb05bb6f287d54e7dcafb61dc4c4549e37ae2f972f3d240bfa7d2ca485b7583137f1bf038bc901f378cea0c305c6a

      Download Submit

    • C:\Users\Admin\AppData\Local\Temp\rufus-4.6p.exe
      Filesize

      1.5MB

      MD5

      8fe64da09af371b02a31828415ece8f3

      SHA1

      5b5c90dcd425c814b555a4567405601aa977ee0b

      SHA256

      8279696c1d78b14618500e9135886a3667b9decc65946f3729002e4bfdbb20ab

      SHA512

      e49f9b1c9d33364101ad2fd4f2c5ed030700cc941bb469cf2ce7d5b32c51cab9e62b265e05cbd92435453e7e4008c9990bea532298676f7d81e5d6dcdc2f590b

      Download Submit

    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms
      Filesize

      7KB

      MD5

      f47aec0ed55e6153eebc2d8c6527794c

      SHA1

      0af824cbeefbc38a69a8999b450777c6cfbee396

      SHA256

      38a653566dfe44e27af3ebe4931f2bf4bd1c41030e5f4c7d686f481d95185cd5

      SHA512

      bd3432acf9119c723cf242a1d985d56cc761c494f522da94363d99914824b4245fba915a23d7be320567a50fe9e2f9308aa4a514695a1699625f25043b5702f6

      Download Submit

    • F:\GET_YOUR_FILES_BACK.txt
      Filesize

      1011B

      MD5

      c92c2b70fb37f84aab38412ad9226aa8

      SHA1

      14f2e9a83285612d0a7b2c83b8f89bccfde6c154

      SHA256

      d64639e873c0873b469cd856d1ef4bce7dc14a80fac6fe2bed9d629f05acc77f

      SHA512

      04f9dcb3cd49909712535255b6eadd7fafcb2902bf1abd5a25e9bb5f5c4dc032611aec0a5b0ec89cd7dbc65276b935c54b906b391507d2e3e3aa65466b15f848

      Download Submit

    • memory/1488-11-0x000000013F550000-0x000000013F9BE000-memory.dmp

      Filesize

      4.4MB

      Download

    • memory/1488-13-0x000000013F550000-0x000000013F9BE000-memory.dmp

      Filesize

      4.4MB

      Download

    • memory/2088-10-0x0000000000E60000-0x00000000012CE000-memory.dmp

      Filesize

      4.4MB

      Download

    • memory/2088-7-0x000000013F8B0000-0x000000013FBE0000-memory.dmp

      Filesize

      3.2MB

      Download

    • memory/2820-494-0x000000001B4D0000-0x000000001B7B2000-memory.dmp

      Filesize

      2.9MB

      Download

    • memory/2820-501-0x0000000001EF0000-0x0000000001EF8000-memory.dmp

      Filesize

      32KB

      Download

    • memory/4088-24594-0x000000001B5E0000-0x000000001B8C2000-memory.dmp

      Filesize

      2.9MB

      Download

    • memory/4088-24595-0x0000000001D90000-0x0000000001D98000-memory.dmp

      Filesize

      32KB

      Download