Office (OOXML) / .XLSX malware analysis — malicious · e910e6a15d55f7d7

MALICIOUS

Office (OOXML) / .XLSX

1.74 MB Created: 2021-09-22 12:07:42 UTC Authoring application: Microsoft Excel 12.0000

MD5: 0aab77bc7f64be6100de694efd5b5572 SHA-1: 221429dc81244fd1b052bbc83952f6b499962912 SHA-256: e910e6a15d55f7d7dfb449be9e6508281254d1e9a6e85aa0997e53a075d13ae1

142 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an Office Open XML (OOXML) file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-entropy anomalies in the Ole10Native stream within this object strongly indicate it carries a malicious payload, consistent with exploitation of CVE-2018-0798. The embedded object itself, 'xl/embeddings/x8ze.GQChiP', is the primary indicator of compromise.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/x8ze.GQChiP 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` `39ee472fcf4fbf5f36ecd602f24d9d2494e5052a0bce61d6fe36fe8e8feeab5c`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/x8ze.GQChiP	2059776 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `868dda24d618cdfd3b52a2d3485d8b2ad28aec45c7afc510be5b8801a976dc98`	ole-package	OOXML xl/embeddings/x8ze.GQChiP Ole10Native stream: Ole10Native	2041101 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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