Office (OOXML) malware analysis — malicious · 8871351f9454c458

MALICIOUS

Office (OOXML)

877.7 KB Created: 2020-07-07 21:52:29 UTC Authoring application: Microsoft Excel 16.0300

MD5: de82dedcd1c5b7e47f01c2cd76202b0b SHA-1: 2d15b173dcff1b893cc52c5b9cd20881dc9f110a SHA-256: 8871351f9454c458eba36e69d3c888151c2ece921bf1dd5decbe3c85646cd538

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The file is an OOXML document containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object is anomalous and carries a payload-like stream, strongly suggesting exploitation of CVE-2018-0798 or a similar vulnerability in Equation Editor for client execution. No document body or scripts were extracted, but the presence of the malicious OLE object is sufficient evidence.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/oleObject1.bin 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` `7075e6d67f1f3478b66c8578359864208f44c61943107e2561119c96d637e556`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	765952 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `c19d71efe5b5748999a46f5daa2aa2fab1ac3f7c038fb246e331e9242ab2372e`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10nativE	757346 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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