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

Static analysis result for SHA-256 6de977aa8a39c4e6…

MALICIOUS

Office (OLE) / .XLS

373.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: ace31e20cf939de39cc89ff9ce2cf9b5 SHA-1: 7c786edc3f7f6fc76e5e0d1433689313ea08fc59 SHA-256: 6de977aa8a39c4e65cb9aa89fc80b739ece45e0c2d4a05f18d80286b720a8bd2
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is an Excel file containing Excel 4.0 (XLM) macros, including an Auto_Open entry, which is a strong indicator of malicious intent. The macros likely use dangerous formula APIs, such as RUN, to execute code. The document body and extracted URLs suggest a lure to download a second-stage payload from the provided domains. The presence of an Auto_Open macro and the lure to enable macros points to a spearphishing attachment delivery method.

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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