Office (OOXML) / .XLSX malware analysis — malicious · 6197de558957b0a2

MALICIOUS

Office (OOXML) / .XLSX

730.1 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-07-04

MD5: 375587260993003baee7d6f6fe25662c SHA-1: 8b246ef54bcf040ec3042177b144cf17770fbd9f SHA-256: 6197de558957b0a2a68094a1704a71d25dc0a33fdd1fa4f1b77ff4e671ad169f

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an OOXML file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size, strongly suggesting exploitation of a known vulnerability. This technique is commonly used to deliver second-stage malware.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/8w.vz 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.
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` `d2ab9cc63b641348ceb814a0cc5b8c4951841ecf2a873f885eba627e67f515b2`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/8w.vz	1049088 bytes
`ooxml_oleobject_00_ole10native_00.bin` `9e4ee5264ea0006d5eca16d56ff840c0df8c396e99d2a35bb6854fcbbaf0d6b9`	ole-package	OOXML xl/embeddings/8w.vz Ole10Native stream: OlE10NATIvE	1038513 bytes

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