Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 cac331b3dd235909…

MALICIOUS

Office (OLE)

523.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2021-06-17
MD5: 91566b858ebe2405ad93382d4174450c SHA-1: c3b39d70f7fbfc2ef1e8e37f260ce612c8f91e78 SHA-256: cac331b3dd2359090c6ff18b110cf383193e4ca219239dbc8399d03dfeffc78a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1204.002 Malicious File

The sample is an Excel 4.0 macro sheet (XLM) that uses an 'enable content' lure to trick the user into running malicious macros. The embedded URLs are likely used to download and execute a second-stage payload, possibly using rundll32.exe as indicated by the extracted script fragments.

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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