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

Static analysis result for SHA-256 79f3040a356e6562…

MALICIOUS

Office (OLE) / .XLS

367.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: e82da46f8b9f619cf9620249e4d4dd21 SHA-1: 198b48965c839acc04d89e1f6930353189f97431 SHA-256: 79f3040a356e656286b91a6a1a96eb2ea2b3b9735c41c824482717f405f01492
102 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN heuristic. The document body and heuristics suggest a lure to enable macros, which would trigger the Auto_Open macro. This macro is designed to download and execute a payload from one of the two embedded URLs, likely serving as a downloader for further malicious activity. The presence of an Auto_Open macro and a lure to enable it strongly suggests a malicious intent.

Heuristics 4

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • 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://mayread.com/aXfFF8qdsV/th.html
    • https://tpcsv.neosj.why3s.tw/XjHoDakG/th.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
7758cbebef832a37ce0a327fd7d893202195f03ba9b854edef74b19dbb11678f		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8349 bytes

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