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

Static analysis result for SHA-256 b35c1d9547995c7e…

MALICIOUS

Office (OLE) / .XLS

337.5 KB Created: 2020-06-22 06:07:04 Authoring application: Microsoft Excel
MD5: 84b48e4b9a2c8858aa90eb0b99688903 SHA-1: a00b38c700c7be66dc566905173b89648e763ab3 SHA-256: b35c1d9547995c7e82860017e38440ad0f0cfd135450a652c49a2c3502d177eb
80 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Service Execution: Service Control

The sample is an Excel 4.0 macro-enabled spreadsheet. Heuristics indicate the presence of an Auto_Open defined name, which is a common technique for executing malicious XLM macros upon opening the workbook. No specific URLs or further payloads were extracted, limiting the ability to determine the exact malicious activity.

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
f6a154196350453dc1770f182456dc067190af1e0eea870847d46fc3fdaaf7c9		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 235959 bytes

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