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

Static analysis result for SHA-256 d301d6344ff5ff4f…

MALICIOUS

Office (OLE) / .XLSX

36.0 KB Created: 2020-11-27 11:43:43 Authoring application: Microsoft Excel
MD5: 6cb03d7ed66cffbf9e8c21044b4298cc SHA-1: cca80bdb333263d12a63cdcd809a70d3605d2ccb SHA-256: d301d6344ff5ff4f16324b4bdcc3c2ba5c9e673a93d5a1dcabd84098b919e5c4
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a critical finding. This indicates the macro will execute automatically when the workbook is opened. The presence of dangerous formula APIs like RUN further confirms the malicious intent to execute arbitrary commands. No specific family could be identified, but the technique is common for initial execution.

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
58da5575babab73b4ffa13819fde523e72a8bf12da0870265cf6d1a4f7bf6b52		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6766 bytes

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