Office (OOXML) / .XLSX malware analysis — malicious · 2ed7bf7fecdd83fb

MALICIOUS

Office (OOXML) / .XLSX

334.3 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 15.0300

MD5: 08b01a09ecfecfa32302cf5690bf6e6b SHA-1: 6769c1c8fd50f1523d50f263565244d14e250472 SHA-256: 2ed7bf7fecdd83fb1f01697be1df04cd6dbca8cb56a7b4a200b979fb2bff900c

142 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 OOXML file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate anomalies within the Equation Editor's native stream, consistent with exploitation of CVE-2018-0798. This suggests the file is designed to leverage this vulnerability to execute a malicious payload when the embedded object is interacted with.

Heuristics 5

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.
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
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin` `fd8822f787578a9192a01e751321fe62edca473c645ce37eadf5ae947f8479e9`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	280576 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `e023c414f14c27571eb82ffe81b6f6f09ecc18d9af5ed1c3f9c380bc5efb7638`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10NAtIVE	275738 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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