Office (OOXML) / .XLSX malware analysis — malicious · ec96022991264841

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 31180f4e9c35a0dbae25f9716726b2c6 SHA-1: 7052ac2e93c695e3d34456e29af28b5beecb60c7 SHA-256: ec96022991264841e5482258fed687aa19233bea0bb57938e493201966089f4a

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 a 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 actual stream size, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. This technique is commonly used to deliver a second-stage payload.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/78hrmw7MF.fdxS2 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` `41d5c1d349d5eb38b7d10f26920e75f1af215b091aaa5a3dc87e269cc782567e`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/78hrmw7MF.fdxS2	950272 bytes
`ooxml_oleobject_00_ole10native_00.bin` `08916702a6c57b7ed6a60e0cf12e78bd3b232877a6927d67d8af1f4a9c497ab5`	ole-package	OOXML xl/embeddings/78hrmw7MF.fdxS2 Ole10Native stream: OLe10naTive	940304 bytes

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