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

Static analysis result for SHA-256 0576528356cbf832…

MALICIOUS

Office (OLE) / .XLS

112.5 KB Created: 2013-07-09 06:59:59 Authoring application: Microsoft Excel
MD5: 33dec27519e9a741acd6cc11276efe0f SHA-1: c736fa770325d0af4bc5d7f842aa111a29105e4c SHA-256: 0576528356cbf83256eec626a7f9f38458499146a931ef2360ee895c75de6695
200 Risk Score

Malware Insights

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

The file is an Excel 4.0 (XLM) macro-enabled spreadsheet. Heuristics indicate the presence of an Auto_Open macro that uses dangerous functions, suggesting it's designed to execute malicious code upon opening. The document body displays a "DOCUMENT PROTECTED!" message, a common social engineering tactic to prompt users to enable macros, which would then trigger the XLM macro execution. The ClamAV detection provides a specific identifier for this threat.

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.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • ClamAV: Xls.Dropper.Agent-8155749-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8155749-0
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
d67bfbc57abca2d3459dd7950ab0d4ffd61f17d6c8a90ee40d3a0ba518d4c29d		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 52171 bytes

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