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

Static analysis result for SHA-256 fa3a36d1c9ebd938…

MALICIOUS

Office (OLE) / .XLSX

51.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 3bfbda6575235c724e41b4e55a34006a SHA-1: 8f06c0343712713deab3c803dfc83111af7911ff SHA-256: fa3a36d1c9ebd938eb5a22c42c33ac26913c7835eea3e5c74ee7c98d8dcded56
80 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is an Excel file containing Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristics. The SE_ENABLE_LURE heuristic confirms the document attempts to trick the user into enabling macros. The embedded macro uses functions like RUN, URLDownloadToFileA, and CreateDirectoryA to download a file from 'http://www.himypets.com/tackzmj/88888.png' and save it as 'C:\Asuses\expl.exe', likely to execute a second-stage payload.

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://www.himypets.com/tackzmj/88888.png�
    • http://www.himypets.com/tackzmj/88888.png

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
9a813e05701bf72fe784c96d1d0e981e7bda423a06c53087d89c8d312d6b8634		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 3492 bytes

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