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

Static analysis result for SHA-256 02b628f049482178…

MALICIOUS

Office (OLE) / .XLSX

117.5 KB Created: 2010-07-07 06:17:59 Authoring application: Microsoft Excel
MD5: b5e43a77199cea5ab3388a01e05410e9 SHA-1: 0d9931cfa600b4f4ef146ee4ab906d6a7b97701e SHA-256: 02b628f0494821786ce3b32ba643af7ce968a228eb825e8dba525e53eebb400e
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open macro. The document body displays a "Protected content" lure, instructing the user to enable editing and content, which is a common social engineering tactic to bypass security measures and execute malicious macros. The presence of Auto_Open and dangerous formula APIs indicates an intent to execute arbitrary code upon opening.

Heuristics 3

  • 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.
  • 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
cb6c3f71ec4b1964aa90d7a6ecaae58aa004d97e5b74463f2ef2e6b7fdd907db		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 59657 bytes

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