Office (OOXML) / .XLSX malware analysis — malicious · 54e459b9722f9aa1

MALICIOUS

Office (OOXML) / .XLSX

94.8 KB Created: 2019-05-27 22:54:04 UTC Authoring application: Microsoft Excel 16.0300

MD5: cc225ef728bcb047bb546d0c62a0c426 SHA-1: ec9a8a52875ec07b193d9dcee86e3be2f079f22e SHA-256: 54e459b9722f9aa133e87abe7a92a8f5500cda7ba967ea9340978cee66631032

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The sample is an XLSX file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate this object exhibits anomalies consistent with CVE-2018-0798, suggesting it carries a malicious payload. The embedded Ole10Native stream has high entropy and a size mismatch, further supporting the exploitation of this vulnerability for client execution.

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` `9f9680313aa0f216a8d399254f52ceb45b0ac082e89ce01b0ecc0717e0edd847`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	92672 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.95, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `a3eb1dafbd3da326f1721acd965e436d3068e27f3e2478f769b55aacbdc1d629`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10nAtIve	89405 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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