Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 6802846906fec8fd…

MALICIOUS

Office (OLE) / .XLS

318.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 31d145b0a462dce22e84f8f00f2f37f7 SHA-1: 3fe48f5420f315949df5881bc25bb6818398a7d7 SHA-256: 6802846906fec8fdd741660730cf96d5d0b2a00eab0fd2daa5d25c6bfcd02f7b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file contains Excel 4.0 (XLM) macros, indicated by the OLE_XLM_AUTOOPEN heuristic. These macros are designed to download a payload from the URL http://platechmold.co.id/ds/1002.gif, as suggested by the OLE_XLM_CELL_ARRAY_URL and EMBEDDED_URL heuristics. The ClamAV detection further confirms its malicious nature as a downloader. The document body mentions 'DocuSign', suggesting a phishing lure.

Heuristics 4

  • URL reconstructed from XLM cell array (1 URL) critical OLE_XLM_CELL_ARRAY_URL
    Excel 4.0 macro sheet stages its payload URL across the BIFF8 Shared String Table (one quoted-char SST entry concatenated with & at runtime) or across individual numeric cells (one ASCII charcode per cell). The reconstructed URL is invisible to literal-bytes URL extraction because it is never contiguous in the workbook stream. URLs were recovered by walking the BIFF8 record stream and decoding SST entries plus LABELSST/RK/NUMBER cells.
  • ClamAV: Doc.Downloader.Docusign0521-9864805-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Docusign0521-9864805-0
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • 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://platechmold.co.id/ds/1002.gif
    • http://platechmold.co.id/ds/1002.gif�

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