Office (OOXML) / .XLSX malware analysis — malicious · fc38ee6cb20e437d

MALICIOUS

Office (OOXML) / .XLSX

1.84 MB Created: 2022-11-18 02:05:27 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-03-13

MD5: f0e7d6fe0d661c5c88e28e55864e8faf SHA-1: 9ad8f4843036c88958384fd1c386a05171e546b1 SHA-256: fc38ee6cb20e437db1bf580ac377e31d354a9cdf9fce07b0925e127209289332

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1559.001 Component Object Model and Distributed Component Object Model

The sample is an Excel file containing an embedded OLE object, specifically identified as a vulnerable Equation Editor component. Heuristics indicate anomalous native stream data within the Equation Editor object, strongly suggesting it's being used to deliver a second-stage payload via exploitation of CVE-2018-0798. No document body or scripts were extracted, but the presence of the vulnerable component is sufficient evidence of malicious intent.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/q7h.KKM 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` `8e018d1e3389f66ad5962fb43959c00954f1c7de280c730642c254bc82cf90a7`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/q7h.KKM	2244608 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` `e0e82bb6ced156fc97497c11b996f8c697caaff0d4b8b09ef6ea7e576054cfae`	ole-package	OOXML xl/embeddings/q7h.KKM Ole10Native stream: Ole10NaTivE	2224180 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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