Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 d2828a8bf81d6758…

MALICIOUS

Office (OOXML) / .XLSX

659.7 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-02
MD5: 3e1103b1ac5c7efb9b87ba7015b8f81f SHA-1: 491eea78c0ad9671da42fcb9f1e666e60a7895fa SHA-256: d2828a8bf81d67589cd0b612ebeea63a682a334e2cdfbd27abe382813ae30e4d
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model and Distributed Component Object Model T1204.002 Malicious File

The file is an Excel document containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to exploit a vulnerability. The presence of this anomalous OLE object strongly indicates a malicious intent to execute arbitrary code upon opening.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/SNYoZ.OA 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.

FilenameKindSourceSize
ooxml_oleobject_00.bin
a942c2667ac2843531f4a32e75e84b1836c50a36c98381ebc50371d3f6d65e69		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/SNYoZ.OA 955904 bytes
ooxml_oleobject_00_ole10native_00.bin
5ce43216cfaa05f365b9624cf69b67b148a34d04f9fe1d96074c4812aa6a707c		 ole-package OOXML xl/embeddings/SNYoZ.OA Ole10Native stream: OLE10nATIve 945928 bytes

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