Office (OOXML) / .XLSX malware analysis — malicious · e80e3b22bf937b23

MALICIOUS

Office (OOXML) / .XLSX

1.59 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-10-01

MD5: 93dbd0b409fe3eb04ee7282d897ddf65 SHA-1: 1984642ce7709ed63a66a37e8daee61e97ff7279 SHA-256: e80e3b22bf937b2394cc25e2dc27facefd7ae13ad68bdbac3c6b23783a567193

202 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an OOXML file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object is anomalous and carries a payload, strongly suggesting exploitation of CVE-2018-0798. The embedded OLE object and its Ole10Native stream are the primary indicators of malicious activity, likely serving to execute a secondary payload upon opening.

Heuristics 6

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/6zEWbc9.1dc 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.
ClamAV: Win.Malware.Agent-9897701-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Malware.Agent-9897701-0
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` `9283c341c7e70d3354428a26d8b572fca387e43aae12499db970987150c4a93a`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/6zEWbc9.1dc	1942528 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `0bb327b8cb19f65ffd188bf7ae66281cb324234228a5c089d158419253803903`	ole-package	OOXML xl/embeddings/6zEWbc9.1dc Ole10Native stream: Ole10Native	1924644 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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