Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f3ff034b4c6e4e13…

MALICIOUS

Office (OLE)

95.5 KB Created: 2008-03-24 01:08:26 Authoring application: Microsoft Excel
MD5: b37d78b275f0bc532b914d87e88faa85 SHA-1: 64181a274df68f6376eeb12f005c8920c1384467 SHA-256: f3ff034b4c6e4e13dc6c1291f4b062bb0349af1abfb21ce9d64f0bf0a25bbc6e
200 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro sheet containing an Auto_Open macro, indicated by critical heuristic firings. The macro sheet's content explicitly mentions 'Excel Formula Macro Virus (XF.Classic)' and 'Poppy by VicodinES', suggesting a known legacy malware family. The macro is designed to execute automatically upon opening, with the intent to infect other workbooks and potentially download or execute further payloads, as evidenced by the presence of dangerous formula APIs like RUN.

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
0ad3e80d9ef7adebda137c62ad46093e7fb5c162ea176d01ed506b4e505c570b		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 14088 bytes

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