Emerging Threathightest

Potential MOVEit Transfer CVE-2023-34362 Exploitation - File Activity

Detects file indicators of potential exploitation of MOVEit CVE-2023-34362.

Convert In Phoenix Studio

Open this Sigma rule in the converter with the YAML preloaded and ready for backend selection.

Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)Created Thu Jun 01Updated Tue Aug 13c3b2a774-3152-4989-83c1-7afc48fd15992023

Emerging Threat

Active Threat

Developed to detect an active or emerging threat. Prioritize investigation of any alerts and correlate with threat intelligence.

Log Source

WindowsFile Event

ProductWindows← raw: windows

CategoryFile Event← raw: file_event

Events for file system activity including creation, modification, and deletion.

Detection Logic

detection:
    selection_generic:
        TargetFilename|contains:
            - '\MOVEit Transfer\wwwroot\'
            - '\MOVEitTransfer\wwwroot\'
        TargetFilename|endswith:
            - '.7z'
            - '.bat'
            - '.dll'
            - '.exe'
            - '.ps1'
            - '.rar'
            - '.vbe'
            - '.vbs'
            - '.zip'
    selection_known_ioc:
        TargetFilename|endswith:
            - '\MOVEit Transfer\wwwroot\_human2.aspx.lnk'
            - '\MOVEit Transfer\wwwroot\_human2.aspx'
            - '\MOVEit Transfer\wwwroot\human2.aspx.lnk'
            - '\MOVEit Transfer\wwwroot\human2.aspx'
            - '\MOVEitTransfer\wwwroot\_human2.aspx.lnk'
            - '\MOVEitTransfer\wwwroot\_human2.aspx'
            - '\MOVEitTransfer\wwwroot\human2.aspx.lnk'
            - '\MOVEitTransfer\wwwroot\human2.aspx'
    # Uncomment selection if you wanna threat hunt for additional artifacts
    # selection_cmdline:
    #    TargetFilename|contains: ':\Windows\TEMP\'
    #    TargetFilename|endswith: '.cmdline'
    selection_compiled_asp:
        CreationUtcTime|startswith:
            - '2023-03- '
            - '2023-04- '
            - '2023-05- '
            - '2023-06- '
        TargetFilename|contains|all:
            - '\Windows\Microsoft.net\Framework64\v'
            - '\Temporary ASP.NET Files\'
            - 'App_Web_'
        TargetFilename|endswith: '.dll'
    condition: 1 of selection_*