Office (OOXML) / .XLSX malware analysis — malicious · e4be4ce928395ea6

MALICIOUS

Office (OOXML) / .XLSX

3.63 MB Created: 2021-04-28 21:02:36 UTC Authoring application: Microsoft Excel 12.0000

MD5: 009c97a279ca9082088dba2dcf8907e4 SHA-1: bc6978d42904ff01b082bce944bb7d2d7f56de8c SHA-256: e4be4ce928395ea670d27d2103761ed240cc5a2fb46e8e7ee34c88aef6fa156e

142 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 is an Office document containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object is anomalous and carries a payload, strongly suggesting exploitation of CVE-2018-0798 or a similar vulnerability in the Equation Editor component. No document body text or scripts were provided, so the exact nature of the payload cannot be determined, but the exploit vector is clear.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/mdl6odfo.5jkk 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` `9e6a0cf6a5c280e73fc664732533dcbf16ca5951c5046b194f55b30531f1c285`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/mdl6odfo.5jkk	4067840 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.94, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `754dacb1e0a45fe3bdea1409a2679ea96532bcca77ca10802931656f25f8efc3`	ole-package	OOXML xl/embeddings/mdl6odfo.5jkk Ole10Native stream: Ole10Native	4033361 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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