Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a5e65e8f7804b865…

MALICIOUS

Office (OLE)

523.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2021-06-04
MD5: 6c3c0f17702364a605a88fc2325faad1 SHA-1: 1367b0a5de75ebf22f3216067e79aacc1bcf143c SHA-256: a5e65e8f7804b8657916d022ed040bb317efe43e2d4cb0bdc9d478a69ec7d81e
102 Risk Score

Malware Insights

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

The sample is an Excel 4.0 macro sheet (XLM) that uses an 'enable content' lure to trick the user into running the embedded macro. The macro appears to be designed to download and execute a payload from one of the provided URLs, likely utilizing rundll32.exe or regsvr32.exe. The specific family is not identifiable from the provided evidence.

Heuristics 4

  • XLM Auto_Open workbook with payload URL or enable-content lure critical OLE_XLM_AUTOOPEN_PAYLOAD_LURE
    Workbook contains an Excel 4.0 macro sheet with Auto_Open / Auto_Close and also exposes a payload URL or enable-content lure in the OLE bytes. This combination is a high-confidence XLM downloader/social-engineering pattern even when formula recovery cannot decode the full macro chain.
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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 https://dev.favterest.com/VBPFHU4UdmdT/filter.html In document text (OLE body)
    • https://ethioshare.com/q22UgZzM3PV7/filter.htmlIn document text (OLE body)

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