Office (OOXML) / .XLSX malware analysis — malicious · 1cea11e60bce272e

MALICIOUS

Office (OOXML) / .XLSX

141.3 KB Created: 2020-11-17 05:15:13 UTC Authoring application: Microsoft Excel 15.0300

MD5: 8bbf38221e93da549de22199cafb1ece SHA-1: 4d650073a4fd46217e891c94d6eca54644addfb6 SHA-256: 1cea11e60bce272e08ef8906924229cc33ba41dc2903ca2c397eb0ca70d85196

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1027 Obfuscated Files or Information

The XLSX file contains 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 execute a malicious payload via the Equation Editor vulnerability.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/oleObject1.bin 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` `d1d925960a97b9b8f1b0d0c7f57a0d94405c6df8891dd53cf84aef833059c4ff`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	140800 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.97, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `a51ca5ea012c4a5bfeb5568d386163f52eb94b9d60fd83f4be0ea4d2f11d4cb3`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OlE10NatiVE	136853 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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