Office (OLE) / .XLSX malware analysis — malicious · fcef254701c53d78

MALICIOUS

Office (OLE) / .XLSX

523.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2021-05-23

MD5: 73040f3c9542f1bd4a65ebba64fac73e SHA-1: fb37c6595347278de2d5ebc94bc903c742ec703a SHA-256: fcef254701c53d78baf6a6ce2ec48e87cf70151be917fc332fdd4e0aa8a8a6bb

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The presence of an Excel 4.0 macro sheet and a heuristic indicating a lure to enable macros strongly suggests a malicious intent. The embedded URLs are likely used to download a secondary payload. No document body text was available for further analysis.

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://rallyautosport.com/CA2Sz1Pz33Sn/utka.html In document text (OLE body)
- https://droneteamproject.gr/BfWvudjrIQMF/utka.htmlIn document text (OLE body)

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