Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6daea6c45a17db78…

MALICIOUS

Office (OLE)

27.5 KB Created: 2010-05-11 15:14:53 Authoring application: Microsoft Excel
MD5: 052a57292c22e8e38cb9322e2674f422 SHA-1: 60ce0cb961b1680b5710387da5a6acb256b82481 SHA-256: 6daea6c45a17db7830442e1c90e6116143a192c353385297a6d5b73820ddfc6d
200 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open macro, which is a known technique for executing malicious code within older Excel versions. The macro sheet contains references to 'Classic.Poppy by VicodinES' and 'The Narkotic Network 1998', suggesting it is a variant of the Poppy macro virus. The macro is designed to infect other workbooks and save them as 'Book1.xls', indicating a spreading or infection mechanism.

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
bf8e6d973931b773e37e7f2ac64edf7dc885666eb134c210b02925bcaa03fc38		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 9474 bytes

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