Office (OOXML) / .XLSX malware analysis — malicious · 560ec9bfb0164d37

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 11b9cd168f9eba13a2c1f925fa169505 SHA-1: 0a18233614c37a598e08849d5318228ee15193de SHA-256: 560ec9bfb0164d377ea10fec64f6f4800b4f901bb87d6595010b5ed0ed0ab5f6

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1559.001 Component Object Model and Distributed Component Object Model

The sample is an Excel file containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. Heuristics indicate anomalies consistent with CVE-2018-0798, suggesting the Equation Editor object is used to carry a malicious payload. The embedded artifacts, including the Ole10Native stream, are highly suspicious and likely contain the second-stage malware.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/oE2Wo.grGre 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` `15b101de697a22f060b62e47e16d6f0caaa3ef83790276341fc9bc641b41894c`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oE2Wo.grGre	1603584 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` `9b53b2d5e265a2c39e13a08e75f40ddef337306e5fc10a677a72b1bad8ce116e`	ole-package	OOXML xl/embeddings/oE2Wo.grGre Ole10Native stream: oLE10NaTIVE	1588640 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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