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

Static analysis result for SHA-256 1dd15819007e29e6…

MALICIOUS

Office (OLE) / .XLS

526.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2021-05-26
MD5: b132df1664309366f4e21d9bcab94316 SHA-1: 7774760468493ad02939cc579aa1f209ff0a578e SHA-256: 1dd15819007e29e6db7345af7525f7868c8a97fe5b9bb761b2b3e5d3c94ba831
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 content-enable lures strongly suggest this document is designed to trick users into executing malicious code. The embedded URLs likely host the next stage of the attack. No scripts were extracted from this sample, limiting further analysis of the macro's specific functionality.

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://digitrac.org/g31Qro72rb4Q/heart.html In document text (OLE body)
    • https://swedish.askochembla.nl/6PNITEcbA/heart.htmlIn document text (OLE body)

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