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

Static analysis result for SHA-256 2f5c016a6ad24db7…

MALICIOUS

Office (OLE) / .XLS

373.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 47727bc03c6c0511ae1e8506db143325 SHA-1: bd3e72a2e78331b5ef0a0d9d9dd52dc893607edc SHA-256: 2f5c016a6ad24db7ec9865fff6fcd4cde1fbe34aa9865afa6feb0df211c6b5cd
160 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros with an Auto_Open entry, which is a critical indicator of malicious activity. The presence of a 'Macro/content-enable lure' heuristic suggests the document attempts to trick the user into enabling macros. The XLM macros utilize dangerous formula APIs, including 'RUN', indicating they are designed to execute arbitrary code. The extracted URLs are likely used to download and execute a second-stage payload.

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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