Office (OOXML) / .XLSX malware analysis — malicious · 83f39166f140540a

MALICIOUS

Office (OOXML) / .XLSX

1.76 MB Created: 2022-11-18 02:05:27 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2024-08-18

MD5: 60b8dbe432e461a63da7d1762ca10fbb SHA-1: 51b8d1dc87765ebdad3d88e28873148bdbe51bc6 SHA-256: 83f39166f140540add080c25e751d1f3a00ddc3848268df86f3b7b6e08a3e76b

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 file is an Office document containing an embedded OLE object, specifically exploiting a known vulnerability in Microsoft Equation Editor (CVE-2018-0798). The Equation Editor object contains an anomalous Ole10Native stream with high entropy, indicating it likely carries a malicious payload. The embedded artifact names suggest a potential dropper mechanism.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/p2hnR6wq6.Zqfim 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` `f837bb35623b490e208fedcb39ed364839e3deb82cf1ec6c93c387b1eed2130e`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/p2hnR6wq6.Zqfim	2092032 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` `b209b43e2853a5db19f372f88899605a608aff3602806bb86eae89df894a3126`	ole-package	OOXML xl/embeddings/p2hnR6wq6.Zqfim Ole10Native stream: olE10NATiVE	2073162 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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