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

Static analysis result for SHA-256 2e5d1fdbd1b44785…

MALICIOUS

Office (OLE) / .XLS

367.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 4c372da0ecd06d49b1cbeeb879b6edbc SHA-1: ec4fd49163c01cbb1dfdfe80be7d48bdbabbf7c5 SHA-256: 2e5d1fdbd1b44785af8666ac59191c707da543a20e75641205bfdf16a309a93d
102 Risk Score

Malware Insights

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

The file 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 macro content indicate that the user is prompted to enable macros, and the embedded URLs suggest a download and execution of a second-stage payload. The XLM macro itself appears to be truncated or obfuscated, preventing a full analysis of its direct actions, but the presence of the Auto_Open entry and the lure strongly indicate malicious intent.

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://escolamundoazul.com.br/ntmQmwXnc6KC/ue.html
    • https://laresumeservice.com/wp7rTKrY/ue.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
e0f9b32b2cf7d5bbad99732afb6eb8bf95619170305ebee6a87504bc690cca2a		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8209 bytes

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