Office (OOXML) / .XLSX malware analysis — malicious · 9028b4835a243e52

MALICIOUS

Office (OOXML) / .XLSX

631.0 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-05

MD5: b6f108c5ae708dfd6209210a7800e35a SHA-1: 619b86c5edea2902ffa49ddc89836001bee11133 SHA-256: 9028b4835a243e52e9f6e9f10662d35d6e56f7f9159845f9c337ae5fcbc9f0c0

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an OOXML document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting exploitation of a vulnerability within the Equation Editor. This is a common technique for delivering second-stage malware.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/L2.mhS6 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` `b482f6ea34d6e56d70cd5f1ad28582c83921c3cdd75afcc207345fc9658a76db`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/L2.mhS6	912384 bytes
`ooxml_oleobject_00_ole10native_00.bin` `d2087f0254a54836c856308e296c840be830a77d9505ced2a72e76f5acae405e`	ole-package	OOXML xl/embeddings/L2.mhS6 Ole10Native stream: OLE10nAtive	903167 bytes

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