Office (OOXML) / .XLSX malware analysis — malicious · 0b1b4fb37a602b25

MALICIOUS

Office (OOXML) / .XLSX

8.3 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300

MD5: 732c227884f8da18a5dc347b68b5b842 SHA-1: c9d9f41e60c006d96b742577352d03493786316a SHA-256: 0b1b4fb37a602b25644ac58316338b973f4a141ba68be320ddfa4950549007f0

100 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is a malicious Excel file containing an embedded OLE object that exploits CVE-2018-0798 in the Equation Editor. This vulnerability allows for arbitrary code execution when the embedded object is activated. No specific family could be identified, but the exploit vector is clear.

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` `2ab11d3a799ad616050840db039a56ef60a89edf26d13c9a476dc4d00030ea26`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	3584 bytes
`ooxml_oleobject_00_ole10native_00.bin` `72954114d3d3272c007802ad25f804b237686d702f0d388c273597fd527cb544`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10NATIVe	1291 bytes

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