Office (OOXML) / .XLSX malware analysis — malicious · 3122e46802fdd1d3

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 88f068751d671c40053bdf391c237bd5 SHA-1: 0885f4d1befb6c12afa526769d6c25ae398412ab SHA-256: 3122e46802fdd1d353960c89b9d2679e5c818d5cf027dff747acd0d0c2aea7b6

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 Office Open XML (OOXML) XLSX document containing an embedded OLE object. Heuristics indicate this object is specifically an Equation Editor object that exploits CVE-2018-0798. The Equation Editor object contains a high-entropy Ole10Native stream, suggesting it carries a malicious payload. The embedded artifacts and the nature of the exploit point to a delivery mechanism for a secondary stage. No specific family is identified due to the lack of script content.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/LRVFPBpxW.U0VJfE 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` `ecd762e9082d64d5c6d1d8fd7033419ed11d0787f8affaa1813be2914f3ccc70`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/LRVFPBpxW.U0VJfE	1775104 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` `ba468649e054e4b642130bfc9a3fa9b545d4e020b01f9706d9363e0ffc155863`	ole-package	OOXML xl/embeddings/LRVFPBpxW.U0VJfE Ole10Native stream: oLE10NatiVe	1758310 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.