Office (OOXML) / .XLSX malware analysis — malicious · 3dad84f65ddaad13

MALICIOUS

Office (OOXML) / .XLSX

1.10 MB Created: 2022-09-30 00:41:36 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-10-05

MD5: c577b761e0bdf2fc2cef21d2d80de197 SHA-1: 507d382a2d810ec66b77c510cb225206ac9bec65 SHA-256: 3dad84f65ddaad138307cd798e48fd40d062dbecbabc8c306eee10189e7e0dcc

142 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an Excel file containing an embedded Equation Editor OLE object. Heuristics indicate this object is anomalous and carries a payload, specifically exploiting CVE-2018-0798. The embedded object's Ole10Native stream exhibits high entropy, suggesting it contains executable code or a further stage payload.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/GvrR.VZBQ6n 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` `d7813cfb824d8ac158c7525f148ac4e28173542591f261345834c84deb6606c0`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/GvrR.VZBQ6n	1393664 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` `9dae6d9628547a4c914fe96a723175e021f7a07b7d3b6f524d7feb4d4907e49f`	ole-package	OOXML xl/embeddings/GvrR.VZBQ6n Ole10Native stream: Ole10Native	1380347 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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