Office (OOXML) / .XLSX malware analysis — malicious · bc7cae6ebd0b3c7a

MALICIOUS

Office (OOXML) / .XLSX

1.62 MB Created: 2022-11-18 02:05:27 UTC Authoring application: Microsoft Excel 12.0000

MD5: 923c0aac695e6c18c2dc1bf90d7b12e1 SHA-1: 24b471f6c260e0de00d01b2070090b3bc018b719 SHA-256: bc7cae6ebd0b3c7a2f69b35bc954efb17393528d4420c9d103d2fa362d225b15

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1027 Obfuscated Files or Information

The sample is an Excel file containing an embedded OLE object, specifically identified as a vulnerable Equation Editor component. Heuristics indicate anomalies in the Equation Editor's native stream, suggesting it's being used to deliver a payload. The high entropy and unusual stream size strongly point towards exploitation of CVE-2018-0798 for arbitrary code execution.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/v7TsgsMo.KwV3N 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` `ce76756bd42fc348cba3faa0b77f5d2707d6ae2c0b756052d4c5e2148ee1631f`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/v7TsgsMo.KwV3N	2001408 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` `0bf60edee36429aac7d236da26fd1620239118aa4f9d0c7e1f6da84906bc53bc`	ole-package	OOXML xl/embeddings/v7TsgsMo.KwV3N Ole10Native stream: oLE10NaTivE	1983424 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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