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

Static analysis result for SHA-256 520d9ebd41e9d64c…

MALICIOUS

Office (OLE) / .XLS

85.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: bf0f3b7412977e5fd4380d2f370b62b8 SHA-1: 685bdda808188ade3918d736f4a82afd4e550fb7 SHA-256: 520d9ebd41e9d64c12426b70503e35ad5fd81a95697d069e0ed0b4dbfed92fd9
80 Risk Score

Malware Insights

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

The file is an Excel 4.0 (XLM) macro-enabled spreadsheet. It contains an Auto_Open macro that uses dangerous API functions, specifically the RUN function, indicating it likely executes external code. The document body and heuristics suggest a lure to enable macros, a common technique for malware droppers. The embedded URL is highly suspicious and likely serves as the download location for 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://ydw27hfhbk02zpidmv.com/fedara.Z

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
89e7be2b0dad4459f55a8bdb03087b2cc55196504c0da685ca59037c304f74e9
xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2100 bytes