Office (OOXML) / .XLSX malware analysis — malicious · 92233ac1359885e9

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: e3832b38f5a21979ae9e82e97c246548 SHA-1: 763f758c69f90e5f298a5b605f1dcba909051b7b SHA-256: 92233ac1359885e91c9f3963065a064be6768c4856755722894b5f8529f10a02

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The sample is an XLSX file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-entropy anomalies within the Ole10Native stream of this object strongly indicate it carries a malicious payload, consistent with exploitation of CVE-2018-0798. The embedded artifact 'xl/embeddings/uF7kQAD5f.LRbEi' is the likely carrier of this exploit.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/uF7kQAD5f.LRbEi 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` `7c36bc6233bd51c37bb98fe3e96a9f900623e7d2cec53b8906e95ffab9bc557e`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/uF7kQAD5f.LRbEi	3279360 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.96, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `9d76467f83b9fc64b0b872157f11bba3f86fcc1d1d4033f4cbe85587ce2f78e1`	ole-package	OOXML xl/embeddings/uF7kQAD5f.LRbEi Ole10Native stream: Ole10Native	3250820 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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