Office (OOXML) / .XLSX malware analysis — malicious · ee2749944646e635

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: f5fec198f8686ae8f7418281069021fd SHA-1: 0c504b341d38a8c98f0bd83f8ff4a38621b73f04 SHA-256: ee2749944646e635377b9272ad45e8b9bf861de7bd719da354dbcc9176726e2e

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 vulnerable Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the stream size, strongly suggesting exploitation. The embedded OLE object is the primary vector for delivering the malicious payload.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/loGpODd.gTf 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` `873ccc38dbf658932bf09e79587c7f667ac26cd40c24f176efafc92215bba93e`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/loGpODd.gTf	1002496 bytes
`ooxml_oleobject_00_ole10native_00.bin` `e83e564f99db4337915013000b80212064489295c7d8e4ce52f35256a8355bdc`	ole-package	OOXML xl/embeddings/loGpODd.gTf Ole10Native stream: olE10nATIVE	992157 bytes

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