Office (OOXML) / .XLSX malware analysis — malicious · dee9dbccdc72a883

MALICIOUS

Office (OOXML) / .XLSX

1.88 MB Created: 2021-09-22 12:07:42 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-05-15

MD5: ddc673b204ae537ef4a1a2822eb78ae3 SHA-1: 19b332640ca163318109c01ecd7be2444bada2f9 SHA-256: dee9dbccdc72a883c21a1b60b35a468a87610ecbd5ac54c6d7df252fbf231a3a

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 T1059 Command and Scripting Interpreter

The file is an Excel spreadsheet 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. This vulnerability allows for the execution of arbitrary code when the embedded object is processed. The embedded artifact 'ooxml_oleobject_00_ole10native_00.bin' is identified as a high-entropy Ole10Native stream, further confirming the presence of a malicious payload.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/kF5VfIh.b8ZBj 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` `e61717cf4a038f744842b962b3b4f0dfb6ad2145245246bb0f78806f6ea2cadb`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/kF5VfIh.b8ZBj	2284032 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` `0be218f0d671646acfb90c78e76b3129d80d886b85e2def2f57097b27aab2ad3`	ole-package	OOXML xl/embeddings/kF5VfIh.b8ZBj Ole10Native stream: Ole10natIvE	2263844 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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