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

Static analysis result for SHA-256 2639a71ab2df53cb…

MALICIOUS

Office (OLE) / .XLS

525.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2026-05-23
MD5: 792034c42c75a838bfcb486cdd3e0b89 SHA-1: 80b44ac59181c877d1b86b83d34e5a697f168b02 SHA-256: 2639a71ab2df53cbb0b8d9b8db510ed4fb45760078d910c656f7302a07e4b02d
142 Risk Score

Malware Insights

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

The file is an Excel 4.0 (XLM) macro-enabled spreadsheet. The presence of an 'AUTOOPEN' macro and the 'SE_ENABLE_LURE' heuristic indicate that the document is designed to trick the user into enabling macros. Once enabled, it likely executes malicious code, potentially downloading further payloads from the embedded URLs. No scripts were extracted from this sample, limiting further analysis of its specific behavior.

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://rathnakumar.com/BuTxTGO63eD/solo.html In document text (OLE body)
    • https://maidzonemobile.com/Voy4zCN8y1/solo.htmlIn document text (OLE body)

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