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

Static analysis result for SHA-256 3817ae81e8efdf32…

MALICIOUS

Office (OLE) / .XLS

367.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: d5d6b2ac2847dc5420d3e5af8e79bf7e SHA-1: e2abf36fbfaeb858534cf43bfdd054f460adc8b1 SHA-256: 3817ae81e8efdf32d13a3c71845e09aa1d419a67cb5b87dd06b55bfae3a246d2
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 macro-enabled spreadsheet that uses an 'Auto_Open' defined name to execute macros upon opening. It contains a 'Macro/content-enable lure' heuristic firing, indicating it prompts the user to enable macros. The extracted URLs are likely used to download a second-stage payload. The XLM macro sheet contains references to these URLs and appears to be designed for automatic execution.

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://stateoftheartacademy.com.br/E4V8njAb2/ue.html
    • https://dsafarm.com/h03itpGP/ue.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
e808156aa76369abc653ef5da0e4637a11444d74c8ce4e627b8f3942d60b3178
xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8209 bytes