Office (OOXML) / .XLSX malware analysis — malicious · 46704d6c1defede7

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: e49cf843c41e56836e09bf52999513f6 SHA-1: 3ac1387abaabe40819e1de3d32879edeecb0f1a7 SHA-256: 46704d6c1defede7337666751756e0e20f4042f577d434f4970d3ec24419493a

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

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/lk0TTmeb8.6Of 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` `a879b927f598220f8c0892123a08919fa239782372d04388ad77823c14b26b60`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/lk0TTmeb8.6Of	1789952 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` `a8fb7cf83f14f1a5393134b17c9458a750aad72bdba3b45ec8f3f3795f8ddf6a`	ole-package	OOXML xl/embeddings/lk0TTmeb8.6Of Ole10Native stream: Ole10Native	1773259 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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