Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1ed470499348c577…

MALICIOUS

Office (OLE)

1.33 MB Created: 2010-01-04 08:56:00 Authoring application: Microsoft Excel
MD5: 8bcebb03435b304ea434bd862e2a5d3c SHA-1: d292f499851e3ff317f898d7cf342cf23a63619b SHA-256: 1ed470499348c5770db5aca0371189235f63102e58cb5a876c8e4cafd519192f
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook. Heuristics indicate the presence of an Auto_Open macro that uses dangerous formula APIs, specifically the RUN function. The embedded scripts reveal that the macro attempts to infect the XLSTART directory with Book1.xls and also references other Excel files, suggesting a potential macro-based downloader or infection mechanism. The document body content appears to be construction-related data, likely a lure.

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
51907fd8b4a38f39a73942ab457ade564d1a98a482204fde9cab428db4a7e065		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 383969 bytes

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