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

Static analysis result for SHA-256 d2f5e81cb656f5e2…

MALICIOUS

Office (OLE) / .XLS

523.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2021-05-29
MD5: 165547879d18863bd16c021c62cdbf60 SHA-1: 19aefc4c9f53ea4a92a48f7aeaadb8339def0db3 SHA-256: d2f5e81cb656f5e2511f7ec5b66bad419c5bde34b72e244a4738d1b05ecb5968
142 Risk Score

Malware Insights

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

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet. It contains a lure to enable macros, indicating it's likely a dropper. The embedded URLs are suspicious and likely host secondary payloads. No specific script content was extracted to further detail the execution flow.

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://hallakjewelry.com/wRVyQrkX/utka.html In document text (OLE body)
    • https://founderscirclecapital.eu/BMqXKrcdkQ4/utka.htmlIn document text (OLE body)

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