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

Static analysis result for SHA-256 5f8e3b19cd4d25ac…

MALICIOUS

Office (OLE) / .XLS

1.67 MB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel
MD5: 1308478b9dfa9544e127daaf4edd18f2 SHA-1: 264e2ecaeb06c43d13b3861d035671873ab4885b SHA-256: 5f8e3b19cd4d25ac396cf64f6f448d88e301cf899142bdb03a28cec42eb71389
82 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is an Excel file containing Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_AUTOOPEN_DEFINEDNAME heuristics. The Auto_Open macro is designed to execute automatically upon opening the document. The embedded URL 'http://itelsys.ma/prod/education.php' is likely used to download and execute a secondary payload. The presence of an Auto_Open macro in an Office document strongly suggests a spearphishing attachment attack vector.

Heuristics 3

  • 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.
  • 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 http://itelsys.ma/prod/education.php

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
29da33e48944d5481384c8f52b3f971d8a16df8dae45b280b0021fd12310c193		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1562 bytes

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