Malicious Office (OLE) / .80 — malware analysis report

Static analysis result for SHA-256 0ab103c68385b745…

MALICIOUS

Office (OLE) / .80

44.0 KB Created: 2008-04-01 09:49:34 Authoring application: Microsoft Excel
MD5: 9031157d5caa0a0a21a0a3d93b3cc7af SHA-1: 20e822b97e6090e6cc4d7d8558c9fc820458e7b5 SHA-256: 0ab103c68385b745a6f50d25a252c6a492de6e010a47cfdb52fbb5da6a1e06c6
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The file contains critical Excel 4.0 (XLM) macro firings, including Auto_Open and Auto_Close, indicating an attempt to automatically execute code upon opening. The presence of dangerous formula APIs like RUN=5 and risky-formula=10 further confirms malicious intent. The document body, while appearing to be a price list, is likely a lure to disguise the macro execution.

Heuristics 4

  • 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.
  • Legacy Excel formula macro virus marker critical OLE_XLS_FORMULA_MACRO_VIRUS
    Workbook stream contains self-identifying legacy Excel formula macro virus markers. This indicates the document carries formula macro virus content even when no VBA project or modern XLM macro-sheet structure is present.
  • 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
2adb29b59ca5b5bb12c18c12ffbf07daa44fa1d5b63ae0153e7f8cda098d85c9		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 19638 bytes

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