Office (OOXML) / .XLSX malware analysis — malicious · c7702da37e2057f2

MALICIOUS

Office (OOXML) / .XLSX

1.97 MB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-06-20

MD5: 6062526a68e490c593686329e2c1464e SHA-1: 10b01c76377cab27c35715f2678c30a8c01c33eb SHA-256: c7702da37e2057f2da641129eed6e1bf3a798a56fca6329e0f417499e1839809

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 Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, with an anomalous header and size mismatch, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. The document body content appears to be a list of parts or inventory items, likely a lure to disguise the malicious embedded object.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/Pc8I6XZdO.pcOOJy 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` `78825cb6164e0ecb4de6eb804c33bd803697c79317e64a75695fa14b0080efb1`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/Pc8I6XZdO.pcOOJy	2816000 bytes
`ooxml_oleobject_00_ole10native_00.bin` `8419cbd0032b0bf46f1946aa51e198402961388ef1a0026a9e68ba6ddb8fbb4b`	ole-package	OOXML xl/embeddings/Pc8I6XZdO.pcOOJy Ole10Native stream: OLE10NATiVE	2791483 bytes

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