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

Static analysis result for SHA-256 ec2920f698c69bdf…

MALICIOUS

Office (OLE) / .XLSX

523.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2021-05-23
MD5: 5c89f585a2e5e6a611d69fb22176eb24 SHA-1: f2bc5b17897086cbdae0419b2a5759a483dc65a3 SHA-256: ec2920f698c69bdfd86315f5c24afbd6f2143afbf334a8be6c8e1591de85a001
142 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File

The presence of an Excel 4.0 macro sheet and a heuristic firing for an enable-lure strongly suggest this file is designed to execute malicious code upon opening. The embedded URLs are likely used to download a secondary payload. No document body text was available for further analysis of the lure's specific content.

Heuristics 5

  • XLM Auto_Open workbook with payload URL or enable-content lure critical OLE_XLM_AUTOOPEN_PAYLOAD_LURE
    Workbook contains an Excel 4.0 macro sheet with Auto_Open / Auto_Close and also exposes a payload URL or enable-content lure in the OLE bytes. This combination is a high-confidence XLM downloader/social-engineering pattern even when formula recovery cannot decode the full macro chain.
  • Excel 4.0 (XLM) macro sheet uses dangerous capability functions high OLE_XLM_DANGEROUS_FN_STATIC
    Workbook contains an Excel 4.0 macro sheet whose formulas reference two or more dangerous capability functions (e.g. CALL into a Win32 API such as URLDownloadToFile, EXEC to launch a process, REGISTER an external DLL procedure, or FWRITE/FOPEN to drop a file) with an Auto_Open / Auto_Close auto-execution name. This is the canonical XLM downloader/dropper shape and is recovered directly from the BIFF records, so it fires even when the full macro chain cannot be deobfuscated.
  • 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 https://psq.com.mx/hDHqOp58UBQv/filter.html In document text (OLE body)
    • https://academy.haleemcampus.com/GxaCS5azoZlJ/filter.htmlIn document text (OLE body)

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