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

Static analysis result for SHA-256 fade4ec595c9a4e4…

MALICIOUS

Office (OLE) / .XLSX

86.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 744fd5ef085e28e7afd68e0592af614c SHA-1: 98a16a9452b36f54cd0612d242d27d5f5d3d19f8 SHA-256: fade4ec595c9a4e4e1cb3443b7110716ecebb09f9908531dc14cafce7cdb6907
80 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File

The sample contains an Excel 4.0 (XLM) macro sheet with an Auto_Open macro that uses dangerous API functions like RUN. The document body and heuristics indicate a lure to enable macros, likely to download and execute a second-stage payload from the embedded URL. The presence of the XLM macro and the lure technique are strong indicators of malicious intent.

Heuristics 4

  • XLM Auto_Open with dangerous formula APIs high 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://rlyrt26rnxw02vqijgs.com/fera/frid.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
7c4e6e8611159b572e384e022cb7e9edbaa0a964189883c047d79a06d41903f6		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2390 bytes

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