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

Static analysis result for SHA-256 021f987ddc6b9bc7…

MALICIOUS

Office (OLE) / .XLS

177.5 KB Created: 2008-08-31 21:11:00 Authoring application: Microsoft Excel
MD5: 42310744987b34a284d93ba0bf9ca449 SHA-1: e3ea3aac4b962e8421a93e9aabec7c084b592022 SHA-256: 021f987ddc6b9bc7b8c561feacd703b7311dd9c1e8921aa19795fb4b953c6dcf
80 Risk Score

Malware Insights

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

The file is an Excel spreadsheet containing Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_AUTOOPEN_DEFINEDNAME heuristics. The presence of an Auto_Open entry suggests that the macro will execute automatically upon opening the file. This is a common technique for delivering malware, likely to download and execute 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
52b288b23eeee563fbc0be6dbf15831d1bc7c8814dd106aa031dc7ef707438bb		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 94414 bytes

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