Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 aa8c9ab3df3a9137…

MALICIOUS

Office (OOXML)

249.0 KB Created: 2021-05-25 21:48:16 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-06-30
MD5: 08512947c2129db7460a0bfff5b7151e SHA-1: cc486b42d4e1a8add28e777540f177b2ba2e4342 SHA-256: aa8c9ab3df3a9137343045d57f868d9d44e4ddcc313a38d8ab2bb2049c713d6b
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The critical ClamAV heuristic identifies the file as Xls.Downloader.Agent08210-9888570-0, a known downloader. The OOXML_CLICKABLE_IMAGE_FORM_LURE heuristic indicates the document contains a deceptive image designed to prompt user interaction, leading to the external hyperlink http://9918931.mfs.gg/He5u76g. This URL is likely used to fetch and execute a secondary malicious payload.

Heuristics 4

  • ClamAV: Xls.Downloader.Agent08210-9888570-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Agent08210-9888570-0
  • OOXML clickable image phishing/form lure medium OOXML_CLICKABLE_IMAGE_FORM_LURE
    Workbook uses a large embedded image as the visible document body and attaches a click-through external hyperlink to that image. The target is a form/collection service or the drawing contains download/view lure text, which is a common credential or document-phishing pattern rather than benign workbook data.
  • External hyperlinks (1) low OOXML_EXTERNAL_HYPERLINKS
    Document contains 1 external hyperlink — clickable URLs are stored as external relationships. First target: http://9918931.mfs.gg/He5u76g
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://9918931.mfs.gg/He5u76g Document hyperlink

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