Office (OOXML) / .XLSX malware analysis — malicious · 636f33c8d8dafa08

MALICIOUS

Office (OOXML) / .XLSX

662.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-24

MD5: 6e2732967286bf399d027a09a1a98426 SHA-1: eda51e5fe2572a430c8962e5e878b8459e1faf7b SHA-256: 636f33c8d8dafa083da59aeedf690cc5b565b797c127cc32acb61a3f17f5d085

100 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an Excel 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, suggesting it's designed to exploit a vulnerability. The large declared inner size compared to the stream size points to potential data manipulation or obfuscation within the embedded object, which is a common technique for delivering malicious code.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/ffQFEnkT.AvG 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` `11efd8d1284b442b0ef6875a8687682c5666fec30d9ca960e585fcca58bb6e4b`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/ffQFEnkT.AvG	957440 bytes
`ooxml_oleobject_00_ole10native_00.bin` `f01b2f00351653c13abc0f60c95846a60501a7fe7f4b5c87cb67a1d09e748ab5`	ole-package	OOXML xl/embeddings/ffQFEnkT.AvG Ole10Native stream: OLE10NAtive	947523 bytes

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