Office (OOXML) / .XLSX malware analysis — malicious · 3332086c711f3948

MALICIOUS

Office (OOXML) / .XLSX

2.04 MB Created: 2021-10-11 13:45:42 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-08-28

MD5: 3f93e2e49b0c4dce6d8e27c8cf63b363 SHA-1: 7048c1887d622eed1b72d66bff99c08330177a70 SHA-256: 3332086c711f39481ffea96768b9921561f4327b89171712eaa7684cc6784703

142 Risk Score

Malware Insights

MITRE ATT&CK

T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file is an Excel document containing an embedded OLE object, specifically a Microsoft Equation Editor object. Heuristics indicate this object is anomalous and carries a payload, exploiting CVE-2018-0798. The embedded object's Ole10Native stream is large and has high entropy, suggesting it contains a second-stage payload. No document body text or scripts were extracted, but the exploit itself is the primary indicator of malicious intent.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/v0cRQlv.j7BY8za 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` `4741431661a62e7f70f5fcd9356405fcd5b98fa42317073fc72b3ae62487c44d`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/v0cRQlv.j7BY8za	2407424 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.97, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `ccfec07d29b92257d0ef3584b4b76241e3de18afbb155e716420a3531361fe77`	ole-package	OOXML xl/embeddings/v0cRQlv.j7BY8za Ole10Native stream: ole10nATIVe	2386259 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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