Office (OOXML) / .XLSX malware analysis — malicious · 59e868574332d2aa

MALICIOUS

Office (OOXML) / .XLSX

18.6 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000

MD5: c11ffc09c80631b3530cbc910298c78f SHA-1: 0827727bf3a2d2c71486c48bf5d41095bbb64669 SHA-256: 59e868574332d2aae75eef795596950f4c27d5b782b1a83853e66663077050ea

100 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The sample is an Office Open XML spreadsheet containing an embedded OLE object. High-severity heuristics indicate the presence of an Equation Editor OLE object and an anomaly associated with CVE-2018-0798, suggesting exploitation of this vulnerability. The embedded object likely serves to execute a malicious payload.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/oleObject1.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY

Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
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` `19fffd67118708f2d3568e6f07e50d1c65d9e20af4bfa56639fa408fa0634f25`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	4096 bytes
`ooxml_oleobject_00_ole10native_00.bin` `2afb4034591a3bf761981f95bc05f08e9c5494b544db342521f793818641f432`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10nAtIvE	1659 bytes

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