Office (OOXML) / .XLSX malware analysis — malicious · 82a7e34ce6cfad8a

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 49b02f299402f974abd68dc39126696f SHA-1: 23529bcfd448b0878709da11d7eb04ff4ad469d3 SHA-256: 82a7e34ce6cfad8ae5b69fca673b3d1bd12c5897b5e047bd48900ef201ee28d5

142 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.001 Malicious Link: Malicious File T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model

The sample is an Office Open XML (XLSX) file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this object exploits CVE-2018-0798 by leveraging an anomalous Equation Editor native stream. This stream appears to carry a payload, suggesting the file's primary purpose is to exploit this vulnerability to execute malicious code.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/9uy.bjBZ 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` `0e821efe1b4ee8b6c4079e0ba213a64fb2a975d74c164fd403584a3cd66f67e9`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/9uy.bjBZ	1885696 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` `d1658d34e347df6a8da6ddf9421e26ca78096f54900670daffaa08eaa9c2c784`	ole-package	OOXML xl/embeddings/9uy.bjBZ Ole10Native stream: oLe10naTIVe	1868621 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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