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

Static analysis result for SHA-256 82f0ff314bc66619…

MALICIOUS

Office (OLE) / .XLS

367.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 73a0fcb1bb42288edf9cb71d2bf2c19c SHA-1: e746f601c01eab7485f4545b2358d955c48a7404 SHA-256: 82f0ff314bc666192e49c0e7c121bf063d577575d50481f573664f084fdce7ea
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 spreadsheet containing an Auto_Open macro, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_AUTOOPEN_DEFINEDNAME heuristics. The SE_ENABLE_LURE heuristic confirms the presence of a user-facing lure to enable macros. The extracted URLs, 'https://signifysystem.com/ceg7AX7oN0o/ue.html' and 'https://fcventasyservicios.cl/k60jvjcT/ue.html', are likely used to download a second-stage payload. The XLM macros themselves are truncated, but the presence of Auto_Open and the embedded URLs strongly suggest 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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