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

Static analysis result for SHA-256 b7b6c60ae1097d9f…

MALICIOUS

Office (OLE) / .XLS

373.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: f289535d3d179a8e5fe79c6d01bde09b SHA-1: b4c1771c5f298224c50bdbec868337e38f3755a6 SHA-256: b7b6c60ae1097d9f64a10b56ce324dc25d846e1412c01fd8c4352f65e60636b3
160 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, designed to execute dangerous functions. The 'Macro/content-enable lure' heuristic confirms the document prompts the user to enable macros. The embedded URLs are likely used to download and execute a second-stage payload. No scripts were extracted, but the XLM macros themselves are the primary execution mechanism.

Heuristics 5

  • 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.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • 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://techserve4u.com/utlqwePl9XKr/alex.html
    • https://evershinesoftware.com/isei5Q7KlsQ5/alex.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
599707db4356dee9b1659b3a18ea6968bd26a6e750ede458308d788c900c5e21		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 5292 bytes

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