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

Static analysis result for SHA-256 4b9d750ebd2a9585…

MALICIOUS

Office (OLE) / .XLS

367.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 7414c921a21d33724de2dfa9b91e7627 SHA-1: a07e7d83b3abee7595fb00b0e2af59c687d6f409 SHA-256: 4b9d750ebd2a95856d19962c4a5f7f1a826c79303796418102f42255bff93acb
102 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet. It contains an Auto_Open macro, which is a common technique for executing malicious code upon opening the document. The document body and extracted URLs suggest a lure to enable macros, leading to the download of a second-stage payload from either https://signifysystem.com/ceg7AX7oN0o/ue.html or https://fcventasyservicios.cl/k60jvjcT/ue.html. The XLM macro itself is truncated, but the presence of Auto_Open and the embedded URLs strongly indicate a downloader functionality.

Heuristics 4

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • 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://signifysystem.com/ceg7AX7oN0o/ue.html
    • https://fcventasyservicios.cl/k60jvjcT/ue.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
c7d4d2bead8580d5104e88300cefa6eb3ebffd421d1191db8449676bfb792ff2		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8209 bytes

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