Office (OOXML) / .XLSX malware analysis — malicious · 2b98c3a23a6ed205

MALICIOUS

Office (OOXML) / .XLSX

2.20 MB Created: 2025-09-22 22:56:50 UTC Authoring application: Microsoft Excel 12.0000

MD5: cd162e2ca4c4721c02ae16f9aff4d62d SHA-1: 26a9551e9ef6eea2bfe1fa96376ee3800f34224f SHA-256: 2b98c3a23a6ed2057e8e84b4d26d42346f4f66ec01b2a959f0eaa01e820e242f

80 Risk Score

Malware Insights

MITRE ATT&CK

T1204 User Execution: Malicious Link T1566.002 Phishing: Spearphishing Attachment

The file is an Excel document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate a lure to enable content, a common tactic for macro-based malware droppers. The embedded OLE object is the primary indicator of malicious intent, likely serving as a payload or exploit delivery mechanism.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/BeaFXnkAr.PMx contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
Embedded OLE object medium OOXML_OLE_OBJECT

Document contains an embedded OLE object
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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin` `d41658ef5a5a26c7413a97659ed75a5bf84bfcd4f884255aebf1b6a9fc23b924`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/BeaFXnkAr.PMx	2947584 bytes

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