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

Static analysis result for SHA-256 fdbb1cd5329f6f40…

MALICIOUS

Office (OLE) / .XLS

155.0 KB Created: 2020-06-28 13:16:02 Authoring application: Microsoft Excel
MD5: 8ae91f1ebd92918eae8553f7b2cb33c2 SHA-1: d63b77a87fbad3e6b12cc6582ab0b52aea93c8aa SHA-256: fdbb1cd5329f6f40f93237ff7c4d0eb499881e457e88f16db21f705899b8683d
80 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 spreadsheet containing an Auto_Open macro. This macro sheet is configured to automatically execute upon opening the workbook. While the specific payload is not discernible from the provided evidence, the presence of an auto-executing macro strongly indicates malicious intent, likely to download and execute a secondary payload or perform other harmful actions.

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
57515a1486ac885bd39bba8ec2579ec87da8a54b04db02db5bf2faa2cd92e8c8		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 110703 bytes

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