Office (OOXML) / .XLSX malware analysis — malicious · d6ed7450cb0db334

MALICIOUS

Office (OOXML) / .XLSX

1.01 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000

MD5: 9f4b49f4db9b9a1fbff9776f840e3c8c SHA-1: 0914819997303706acfea6070f35a9e0259f72d9 SHA-256: d6ed7450cb0db334e7c9a51a694b32bc1d845f387a7047d0baed0337c404e119

102 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: User Execution: Malicious Attachment T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model

The file is an Office Open XML (OOXML) document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate the presence of CVE-2018-0798, an anomaly in the Equation Editor's native stream, suggesting exploitation. This points to an attack pattern where the document leverages this vulnerability to execute arbitrary code upon opening. No scripts were extracted, and the document body was not readable.

Heuristics 4

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
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin` `0df317d3dc094c0caf5086bc0d73ae28697adb63bc63f6c6b63876c1459f0ff8`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	1012224 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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