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

Static analysis result for SHA-256 4242bbd06fec9877…

MALICIOUS

Office (OLE) / .XLS

525.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2021-05-26
MD5: 6a9d1c14b70d78978ddffa393e2ce8ba SHA-1: e503aeba8059bc2eaa276751aa88f64e628a612f SHA-256: 4242bbd06fec9877000c1df8d89d740eba78b85c1d741e65ea4c93182dbff0ce
142 Risk Score

Malware Insights

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

The file contains an Excel 4.0 (XLM) macro sheet, indicated by the OLE_XLM_AUTOOPEN heuristic. The SE_ENABLE_LURE heuristic suggests the document is designed to trick the user into enabling macros. The presence of embedded URLs further supports the likelihood of a malicious download or redirection attempt. No document body text was available to provide further context on the lure.

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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