Office (OOXML) / .XLSX malware analysis — malicious · 4234283ecd4c6a4c

MALICIOUS

Office (OOXML) / .XLSX

9.1 KB Created: 2020-04-21 14:35:51 UTC Authoring application: Microsoft Excel 12.0000

MD5: bc3d55c1558d64fe06ea8073ea407bdf SHA-1: ce9020c3d0bfeffa8a68ace8432e4edc82171643 SHA-256: 4234283ecd4c6a4caf71907ca77004bcf99853b6945fe8f457045beb9a1ec047

100 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The file contains an embedded OLE object specifically identified as an Equation Editor object. High-severity heuristics indicate an anomaly consistent with the CVE-2018-0798 Equation Editor vulnerability, suggesting it's designed to exploit this known flaw. This exploit likely serves as a dropper for a secondary 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` `9720bf53f72baa257dcd120352a549ab4a2b6eb05f9a1ab5ce2e3b5c24bd3814`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	4096 bytes
`ooxml_oleobject_00_ole10native_00.bin` `7fc34da91df092fcc34df72578ca16d8c6ce31529ad7de7a04af9ec636be6ed1`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OlE10NAtIVE	1889 bytes

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