Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8034fa910cf12a96…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:44:20 Authoring application: Microsoft Excel
MD5: 5e1df3b034bce837ad0c34854fce8df4 SHA-1: ad2b18e65a3d84c10d72b9b215f0cdba437b8dd2 SHA-256: 8034fa910cf12a963b230885b632daf2be7a82ab3cff295ef60968de7eb95f23
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a known technique for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN indicates an intent to execute arbitrary commands or scripts. The document body contains heavily obfuscated text, suggesting an attempt to hide the malicious payload.

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
598270d9ece75b36dcd19d3a50590da93428617c27cae05a998af39767cfa034		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6560 bytes

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