Office (OOXML) / .XLSX malware analysis — malicious · 9e89ae3e1c950baa

MALICIOUS

Office (OOXML) / .XLSX

947.8 KB Created: 2023-01-19 05:24:18 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-02-06

MD5: 06eff9fb8f6098158272b5a9ff87f0fd SHA-1: 934dbfa6420ece2eedc1b197bb52d72a733c35f7 SHA-256: 9e89ae3e1c950baa301e0061cbbd578b35bd9bd016afd77ed9495c70a1999956

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 file is an Excel document containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. Heuristics indicate anomalies consistent with CVE-2018-0798, suggesting the object is designed to exploit this vulnerability. The embedded object, identified as 'ooxml_oleobject_00_ole10native_00.bin', likely carries a second-stage payload, although its exact nature cannot be determined from static analysis alone.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/uYhOb8C.43gVh 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` `8d2cd7fd032e6baf18b951adc6bc3a8dc61cfcc7ec4ce82bc1544b47b71a0bcb`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/uYhOb8C.43gVh	1206784 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.65, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `fd520d7d8d9759fd47e7033d03bb3a3b1b4b7ad08ddcb248922a75917856896b`	ole-package	OOXML xl/embeddings/uYhOb8C.43gVh Ole10Native stream: ole10NAtiVe	1194923 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.63, consistent with packed or encrypted content.

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