Office (OOXML) / .XLSX malware analysis — malicious · 82cec82230bedc61

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 7662b969e5de9a46224078963ec8286c SHA-1: 4a007ce0f1f3d33d8ff44a1bc1da2689eaa66de3 SHA-256: 82cec82230bedc61c4206eb6fe7aa9ed9b3173468b591b77a0a0cfd998869a9a

142 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an OOXML file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate anomalies within the Equation Editor's native stream, consistent with exploitation of CVE-2018-0798. This suggests the file is designed to exploit this vulnerability to execute a malicious payload, likely delivered via the embedded OLE object.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/ifkvdQ9y.Ly 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` `3d7ee45b71dc522cd8558e597456f68348412bb1a9a3cccab4543258772e2599`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/ifkvdQ9y.Ly	2129408 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` `8f46dea19cd227e73a73bedfd9a991e1364703738de9634426c066e3cbb631c2`	ole-package	OOXML xl/embeddings/ifkvdQ9y.Ly Ole10Native stream: OLE10NaTivE	2110455 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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