Office (OOXML) malware analysis — malicious · 823e1c74b96a428e

MALICIOUS

Office (OOXML)

627.4 KB Created: 2021-02-03 07:57:22 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2021-07-10

MD5: cfd48559df41e5c43904f57b2657cb6c SHA-1: 2979aff38c12d8c879f0470db288f58b3c00adf6 SHA-256: 823e1c74b96a428e28b030569b01deb1c442f663c37440db3e3e8bae7e086c41

180 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The file is an Excel document containing an embedded OLE object, specifically an Equation Editor object. High-severity heuristics indicate that this object is anomalous and likely contains a payload, exploiting CVE-2018-0798. The embedded object's native stream is suspicious and suggests arbitrary code execution capabilities.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/KZVGykv.Izo5iOr 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.
Suspicious extracted artifact high 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.
Embedded OLE object medium OOXML_OLE_OBJECT

Document contains an embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/KZVGykv.Izo5iOr	883712 bytes
SHA-256: `4b9a516b3137a5a4dc68db4a0c23dfc690fb300321f02750acd4a389e50c7e50`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): mshta2kPFeJia6pmoaIxp79CrsXQHaj7dQpI0viYZLJYV3wbvR4WKpJuAkYLZXREYz6UHR3td3RG4HVIgbDIYfIQHRP2qlaKi7wG6defaM7cxmQ8Ga617hz1MTUFlJ2jFLkO6VQAakiOpcdOnwAUivJ0ZNEmzCigKCvew
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML xl/embeddings/KZVGykv.Izo5iOr Ole10Native stream: Ole10NATivE	874039 bytes
SHA-256: `72425584372fba3bf21feb4de09ff8120c34ba243626b840dc2ee053fd880a10`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): mshta2kPFeJia6pmoaIxp79CrsXQHaj7dQpI0viYZLJYV3wbvR4WKpJuAkYLZXREYz6UHR3td3RG4HVIgbDIYfIQHRP2qlaKi7wG6defaM7cxmQ8Ga617hz1MTUFlJ2jFLkO6VQAakiOpcdOnwAUivJ0ZNEmzCigKCvew

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