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

Static analysis result for SHA-256 0c816905e4c5e91e…

MALICIOUS

Office (OLE) / .XLS

970.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 00c101371e165e9d1b48d9899508895f SHA-1: 1a120ead4f056cda401530e8d8364ad44f997302 SHA-256: 0c816905e4c5e91e2a5aaee5d2ffdfc49c63b07b8c2af8d249e83d0d8f3bbc0d
80 Risk Score

Malware Insights

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

The file is an Excel spreadsheet containing Excel 4.0 macros, specifically an Auto_Open macro, which is a strong indicator of malicious intent. The document body text and macro sheet names suggest a lure related to DocuSign, aiming to trick the user into clicking a link. The macro likely attempts to navigate the user to the reconstructed URL http://beachtreepestcontrol.com/viewer/counter.php to download a secondary payload.

Heuristics 2

  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
7a4e71f3c35eb5ad8d8ed644d4980a335b4d641facc8695ce281666f33280fad		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2012 bytes

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