Office (OOXML) / .XLSX malware analysis — malicious · 22ab6e5185edc9a5

MALICIOUS

Office (OOXML) / .XLSX

641.6 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-14

MD5: 89fcc429a9f0f7d29e97a914fca18707 SHA-1: 10a7506320c77ef8bad825a99268ef2f2245a9a5 SHA-256: 22ab6e5185edc9a5fc838608a94db9a0441607a4c3118dec5838aa1ddb821522

100 Risk Score

Malware Insights

MITRE ATT&CK

T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file is an OOXML document containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size discrepancy, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This is a common vector for delivering secondary malware payloads.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/uN9S3Pt.7e2 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` `30150a21dcb916563d3a692cb322ba67e456c5b25e5974c220e4f6a4b8403bc4`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/uN9S3Pt.7e2	892928 bytes
`ooxml_oleobject_00_ole10native_00.bin` `b054fa3288603dd20d35ee529dafc7ddfaf8218ce8f872ea2776ee84dd52553a`	ole-package	OOXML xl/embeddings/uN9S3Pt.7e2 Ole10Native stream: OLe10NaTIve	883514 bytes

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