Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8f83dd83b9b6947b…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:42 Authoring application: Microsoft Excel
MD5: ced27817a0c06bde6f0246f8a083ed7a SHA-1: b0147f694f1801a3d6c4c4d43a4b85155f06b924 SHA-256: 8f83dd83b9b6947b7a969e0ee217d5b158561314fa225ee86c53e759911f0fb8
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook. Heuristics indicate the presence of an Auto_Open function, which is a common technique for executing malicious code upon opening the document. The macro sheet contains references to dangerous formula APIs, including RUN, suggesting it is designed to download and execute a secondary payload. No specific family could be identified.

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
32ec3930f02e71d0a0f52d8bcf064776dd43536470e7cdcc5d2270223d9b98ef		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6712 bytes

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