Analysis

  • max time kernel
    138s
  • max time network
    126s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/08/2024, 09:46

General

  • Target
    d5cfd09fd7161493290e9e15a2bdbe15.msi
  • Size 4.8MB
  • Sample240819-lrtk2axbpf
  • SHA256 e8a5b808ec57fa33d43f8ca7cc74a7c7e00166dc9307fe1e82fc1e099f0cf5e6
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Drops startup file 1 IoCs
  • Blocklisted process makes network request 1 IoCs
  • Downloads MZ/PE file
  • Enumerates connected drives 3 TTPs 46 IoCs

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

  • Looks up external IP address via web service 1 IoCs

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

  • Drops file in Windows directory 13 IoCs
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 9 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Event Triggered Execution: Installer Packages 2 TTPs 1 IoCs
  • 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.

  • Script User-Agent 1 IoCs

    Uses user-agent string associated with script host/environment.

  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 2 IoCs
  • Suspicious use of WriteProcessMemory 7 IoCs

Processes

  • C:\Windows\system32\msiexec.exe
    msiexec.exe /I C:\Users\Admin\AppData\Local\Temp\d5cfd09fd7161493290e9e15a2bdbe15.msi
    1⤵
    • Enumerates connected drives
    • Event Triggered Execution: Installer Packages
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of FindShellTrayWindow
    PID:3560
  • C:\Windows\system32\msiexec.exe
    C:\Windows\system32\msiexec.exe /V
    1⤵
    • Enumerates connected drives
    • Drops file in Windows directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3056
    • C:\Windows\syswow64\MsiExec.exe
      C:\Windows\syswow64\MsiExec.exe -Embedding 1B660F234BB3C0348CAA3F5768D464A9
      2⤵
      • Drops startup file
      • Blocklisted process makes network request
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:1492
      • C:\Users\Public\Videos\Rar.exe
        "C:\Users\Public\Videos\Rar.exe" x -df -y "C:\Users\Public\Videos\4264AEE2-12ED-D1A6-CC0E-592088C8E805.rar" "C:\Users\Public\Videos\"
        3⤵
        • Executes dropped EXE
        PID:2012
      • C:\Users\Public\Videos\4A073466-D405-7164-BCBC-08428D72F4A4.exe
        "C:\Users\Public\Videos\4A073466-D405-7164-BCBC-08428D72F4A4.exe"
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • Suspicious behavior: GetForegroundWindowSpam
        PID:3472

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        e57aaba.rbs

        • Path C:\Config.Msi\e57aaba.rbs
        • Size 8KB
        • SHA256 010a1459c9b6568aeeb019a073b2a614e0a0c7c8b6d8b746053207c826c008c8
        • MD5 SHA1 SHA512 SSDEEP

        4264AEE2-12ED-D1A6-CC0E-592088C8E805.rar

        • Path C:\Users\Public\Videos\4264AEE2-12ED-D1A6-CC0E-592088C8E805.rar
        • Size 5.2MB
        • SHA256 c087eeefacdfcce51e9d4218832a522eef4bf7058ebc3390e98298b04859412e
        • MD5 SHA1 SHA512 SSDEEP

        EIUWI383IE

        • Path C:\Users\Public\Videos\EIUWI383IE
        • Size 639KB
        • SHA256 04c777837d0d418e78fddbbb35587b205e1a424adda5a552363e2164cf2df686
        • MD5 SHA1 SHA512 SSDEEP

        Rar.exe

        • Path C:\Users\Public\Videos\Rar.exe
        • Size 744KB
        • SHA256 0b1866b627d8078d296e7d39583c9f856117be79c1d226b8c9378fe075369118
        • MD5 SHA1 SHA512 SSDEEP

        tier0_s64.dll

        • Path C:\Users\Public\Videos\tier0_s64.dll
        • Size 385KB
        • SHA256 68380282f65cd2a772f6743b05761f9abd6c4dcf0f326af2e0873e5f0985f985
        • MD5 SHA1 SHA512 SSDEEP

        vstdlib_s64.dll

        • Path C:\Users\Public\Videos\vstdlib_s64.dll
        • Size 6.1MB
        • SHA256 69967f642ef23e5b53f7c010f6971872abf2f008218ffbbd964229f3e62d19bb
        • MD5 SHA1 SHA512 SSDEEP

        MSIAB05.tmp

        • Path C:\Windows\Installer\MSIAB05.tmp
        • Size 816KB
        • SHA256 8d633efeda1249356b11bf8f46583242356e4f903056b53bd25a99511d1790a1
        • MD5 SHA1 SHA512 SSDEEP

        memory/3472-129-0x000001937AE60000-0x000001937B48A000-memory.dmp

        memory/3472-142-0x00007FFDBA670000-0x00007FFDBAC9A000-memory.dmp

        memory/3472-144-0x0000019362000000-0x0000019362012000-memory.dmp