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

Static analysis result for SHA-256 5b7627506079d6b4…

MALICIOUS

Office (OLE) / .XLSX

36.0 KB Created: 2020-11-25 10:35:11 Authoring application: Microsoft Excel
MD5: 083180373c90e327242248101c9864a1 SHA-1: dc2a7972b88fde241ac1f5e06e1379d20f9351b4 SHA-256: 5b7627506079d6b4a76014527299bbb178f4e4bc94646efc5c7ffdedbb459f71
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a known technique for executing malicious code. The presence of dangerous formula APIs like RUN indicates an attempt to run arbitrary commands. While the exact payload is not discernible from the provided evidence, the mechanism strongly suggests a downloader or initial execution stage.

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
46ac9d9bb34daa423c034892c9f645550ea67a1dd3183840a4888f08699c6c86		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6401 bytes

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