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

Static analysis result for SHA-256 8e0e96bd0925caed…

MALICIOUS

Office (OLE) / .XLSX

116.0 KB Created: 2013-10-15 06:56:59 Authoring application: Microsoft Excel
MD5: ff4f70ba5040ef3c2e80f8c5d92c74cf SHA-1: 150aa69a95e02334eb0a87f9f3a77016dcc71ed2 SHA-256: 8e0e96bd0925caed4572c185e84f8962de7bff6aece93e282b1cdb91a86a38b9
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a known technique for executing malicious code upon opening a document. The presence of 'Document created in previous version of Microsoft Excel' and prompts to 'Enable Editing' and 'Enable Content' suggests a social engineering lure to bypass security measures. The XLM macros are configured to run automatically, indicating an intent to execute a payload.

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
8ab6d12c30c9664dc8db3757a53c452540154d20e467512b7712a6c3eac4def8		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 59897 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.