Office (OOXML) / .XLSX malware analysis — malicious · 3576c74916522362

MALICIOUS

Office (OOXML) / .XLSX

1.89 MB Created: 2022-11-18 02:05:27 UTC Authoring application: Microsoft Excel 12.0000

MD5: 581ec6d09547a4d7f6486848b5b0d550 SHA-1: b8132494881408956e1a98813b3083bf0f694c40 SHA-256: 3576c7491652236210183f0b6620586017fec98ca0d2628abd1aaa4c26791f56

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. Heuristics indicate this object exploits CVE-2018-0798 due to anomalous native stream properties and a high-entropy Ole10Native stream, suggesting it carries a malicious payload. The embedded artifact 'xl/embeddings/iLrr8fURC.1Pp1U' is the likely carrier of this exploit.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/iLrr8fURC.1Pp1U 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` `dd72e721ea760d50887279c43e8dd4c1c8c078794fc99f5b32f1de3b60f25e85`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/iLrr8fURC.1Pp1U	2212352 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` `d1a1666a6112a692b8cdae815dc04624ec8e3c12411f6fd987e07be0ce782027`	ole-package	OOXML xl/embeddings/iLrr8fURC.1Pp1U Ole10Native stream: OLE10nAtIVE	2192890 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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