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

Static analysis result for SHA-256 b7c9d50b60f4d0a6…

MALICIOUS

Office (OLE) / .XLS

373.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: cd7b1a1c39a9e67077b66379b528fdb5 SHA-1: da24325c6e2756f04af05d60bc17f90a157f9293 SHA-256: b7c9d50b60f4d0a6ed0f2a7303b43a986b7c0f4381f0e98cb5caac1738344e48
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1071.001 Web Protocols

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet. It contains an Auto_Open macro that uses dangerous API calls, specifically 'RUN', indicating it is designed to execute arbitrary code. The document body and embedded artifacts suggest it attempts to trick the user into enabling macros, a common lure. The XLM macro likely downloads and executes a second-stage payload from one of the provided URLs.

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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