Office (OOXML) / .XLSX malware analysis — malicious · 9dc28032b948ad86

MALICIOUS

Office (OOXML) / .XLSX

261.4 KB Created: 2021-02-03 07:57:22 UTC Authoring application: Microsoft Excel 15.0300

MD5: d493c909255bee06bd7d3c13e88d92ce SHA-1: 319d53d8f468b3c18864a65fa10efe942b57c29a SHA-256: 9dc28032b948ad86f9c14fba58ed1502cde50d99e79f9ee916be3afb1b5fbb96

142 Risk Score

Malware Insights

MITRE ATT&CK

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

The XLSX file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate this object is anomalous and carries a payload, strongly suggesting exploitation of CVE-2018-0798. This technique is commonly used to execute arbitrary code by leveraging vulnerabilities within the Equation Editor component.

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` `706d22593a4190bc61e0e4bf806cb83d97b3895748a7ee0d22a96b6b965db5a9`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	264192 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` `3601ecdba24018ddaf388ca08054657359fac0f3bba8ee0530963ccc28610c7d`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OlE10nativE	259328 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.