Office (OOXML) / .XLSX malware analysis — malicious · a32ff717e619c77f

MALICIOUS

Office (OOXML) / .XLSX

1.09 MB Created: 2021-08-09 02:12:21 UTC Authoring application: Microsoft Excel 12.0000

MD5: b4686408d1cb8d4e049f23b44fcbbd03 SHA-1: c787bc41d40851dac87856af201267ddc08e8cfe SHA-256: a32ff717e619c77fafaf5c890989a30b10f42c99e578f25f9115282b97e8ae9c

142 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious File T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The file is an Excel document containing an embedded Equation Editor OLE object. Heuristics indicate this object is anomalous and likely carries a payload, specifically exploiting CVE-2018-0798. The embedded artifact 'xl/embeddings/qxKkphE.kbi' is identified as the potential carrier of this exploit. The high entropy and anomalous structure of the 'ole10NATIVE' stream within the Equation Editor object strongly suggest it's designed to execute malicious code.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/qxKkphE.kbi 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` `447200fee257d6e23a0d816bd348c258c430bb6138f05689653b2822719bb11c`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/qxKkphE.kbi	1378304 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `3391b455c87aa89e09f96114fd0d7eae17e41e159ab4077a679e08e2b38a210b`	ole-package	OOXML xl/embeddings/qxKkphE.kbi Ole10Native stream: ole10NATIVE	1364948 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.97, consistent with packed or encrypted content.

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