Office (OOXML) / .XLSX malware analysis — malicious · 754edb9338be678e

MALICIOUS

Office (OOXML) / .XLSX

1.42 MB Created: 2022-09-30 00:41:36 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-10-10

MD5: 247d9aad403f004591a57786a545af6f SHA-1: 95a1c688cefd9a9d5d2b747ce7a05d292b8bf57c SHA-256: 754edb9338be678e85f50b5122848779da6effc41927be90920d5b1e814fa152

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 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, consistent with exploitation of CVE-2018-0798. This suggests the file is designed to exploit this vulnerability to execute a malicious payload.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/1ezC.PIo 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` `f455092883424300d9f3b76225269d40fa43e58e902b1e9eff4011678862d2b6`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/1ezC.PIo	1728000 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` `e39501d6b322283dc0be43f20607355a8be4be0ddfb59d73b1f6504278c8599e`	ole-package	OOXML xl/embeddings/1ezC.PIo Ole10Native stream: Ole10Native	1711819 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

Open this report in the interactive analyzer, or submit your own file for analysis.