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

Static analysis result for SHA-256 91bafb6fe7fa09b3…

MALICIOUS

Office (OLE) / .XLS

367.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: a056a176ed3480a6bc494cc23041299f SHA-1: 49e898a8ef0b6d17f87498ea4cefc5484d931e6a SHA-256: 91bafb6fe7fa09b345b3aa9aa82d89e27eecf1ad401298fdf676b0a7947efa24
102 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, including an Auto_Open defined name, which is a strong indicator of malicious intent. The 'SE_ENABLE_LURE' heuristic confirms that the document likely prompts the user to enable macros. The extracted URLs, 'https://escolamundoazul.com.br/ntmQmwXnc6KC/ue.html' and 'https://laresumeservice.com/wp7rTKrY/ue.html', are likely used to download a secondary payload. The XLM macro itself is truncated, preventing a full analysis of its specific actions, but the presence of Auto_Open and the lure heuristic strongly suggest a downloader pattern.

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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