Office (OOXML) / .XLSX malware analysis — malicious · 653073896eabac98

MALICIOUS

Office (OOXML) / .XLSX

1.03 MB Created: 2022-09-30 00:41:36 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-10-02

MD5: 40764c7d15232349e4b538585dcadf9b SHA-1: 5ed461b614adeaf835e1e0e32bf083931a357533 SHA-256: 653073896eabac98baf2ba6b0e4c94a3ed1e07bd7a34efb363ba72726b8573d1

142 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an Excel document containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object is anomalous and carries a payload, strongly suggesting exploitation of CVE-2018-0798. The embedded artifacts, ooxml_oleobject_00.bin and ooxml_oleobject_00_ole10native_00.bin, are likely the delivered malicious payload.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/6rgw7AzX.HKdZeR 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` `c79710501efce499243af8e4d722438d43c49c67201ca76c98aed4e1e731223e`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/6rgw7AzX.HKdZeR	1366016 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.41, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `a813b6bd4a9d22b8f5b37d0b087b0accfe96a3e845d8260ce5dd0036cfc03adf`	ole-package	OOXML xl/embeddings/6rgw7AzX.HKdZeR Ole10Native stream: oLe10nAtive	1353017 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.40, consistent with packed or encrypted content.

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