Office (OOXML) / .XLSX malware analysis — malicious · 91a506fbeca27293

MALICIOUS

Office (OOXML) / .XLSX

2.85 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2026-06-10

MD5: 23288c5ad000c2238568b140a1a8bbe9 SHA-1: 26e807c5e74b0ffcbbd4d6b931c77092c6f135e6 SHA-256: 91a506fbeca27293095ab35e39c9978405fc3ad7201d6d6331203a68e8322008

140 Risk Score

Heuristics 4

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/jls2SEl.w2l contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY

Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
Embedded OLE object medium OOXML_OLE_OBJECT

Document contains an embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/jls2SEl.w2l	2873344 bytes
SHA-256: `77b1c380b70c566535c36eae01711f70d5d958a839c5f3478c48cb4a9df42a58`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): mshta2kPFeJia6pmoaIxp79CrsXQHaj7dQpI0viYZLJYV3wbvR4WKpJuAkYLZXREYz6UHR3td3RG4HVIgbDIYfIQHRP2qlaKi7wG6defaM7cxmQ8Ga617hz1MTUFlJ2jFLkO6VQAakiOpcdOnwAUivJ0ZNEmzCigKCvew
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML xl/embeddings/jls2SEl.w2l Ole10Native stream: OLE10NATiVE	2848650 bytes
SHA-256: `848a49d41a2e457dac7b56a1b2353e08b2f4be60f736292f3fc597e904562179`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): mshta2kPFeJia6pmoaIxp79CrsXQHaj7dQpI0viYZLJYV3wbvR4WKpJuAkYLZXREYz6UHR3td3RG4HVIgbDIYfIQHRP2qlaKi7wG6defaM7cxmQ8Ga617hz1MTUFlJ2jFLkO6VQAakiOpcdOnwAUivJ0ZNEmzCigKCvew

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