Office (OOXML) / .XLSX malware analysis — malicious · 675fc46ff4e5c66a

MALICIOUS

Office (OOXML) / .XLSX

609.4 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-06

MD5: 10b5dc19c8db89788b82d5d4edcc5e05 SHA-1: 6011d15b4b84347cf65da617ebf4f6b3003c41ad SHA-256: 675fc46ff4e5c66ac24386e438a72ea86ff76329868a3cfe7fdc0b71af79cbff

100 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous structure and size, strongly suggesting it's used for exploitation. The document body appears to be a fabricated invoice, likely a lure to encourage opening the malicious object.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/prIs6.c8 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` `cddbd578be4e8e3be204cfe30fd9cdda549778ffa4e0857b47a5fb01174ebc98`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/prIs6.c8	867840 bytes
`ooxml_oleobject_00_ole10native_00.bin` `b250fea8a56d87f0c1e97cd309a4fa54e89a87c07067d01ff691520980053721`	ole-package	OOXML xl/embeddings/prIs6.c8 Ole10Native stream: oLE10NatIve	858165 bytes

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