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

Static analysis result for SHA-256 137a10ea08c0dbf9…

MALICIOUS

Office (OLE) / .XLS

373.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: c2c32bf028b7b0486f224e2aadda911e SHA-1: 7ad2759865a9f92fa31e63f6f1c450b92da04d26 SHA-256: 137a10ea08c0dbf92843d1579d2a3db346da2d3acbba0c494ade9c282b37beef
162 Risk Score

Malware Insights

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

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet. It contains an Auto_Open macro that uses dangerous functions like RUN, indicating it's designed to execute arbitrary code. The document body and extracted URLs suggest it attempts to lure the user into enabling macros to download a second-stage payload from the provided URLs. The XLM macro likely uses functions to download and execute files, potentially involving 'DllRegisterServer' and 'l32'.

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://pfamilydentist.com/OgdaW8AjEF/alex.html
    • https://thevoorpret.com/wQSapbrm9WmH/alex.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
7eb5e48f136258965c2495a123fc1d7ae2138b901360da5008973ba86cc22008		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 5292 bytes

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