Office (OOXML) / .XLSX malware analysis — malicious · 713af9510c2b0807

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: d612742a825254d2942e024dacc3c7b5 SHA-1: b680b3e40fae0870815aaf592a80bf139bc4db41 SHA-256: 713af9510c2b080774d1af7ffaec3750729062852928974dbaacd3bf5c2e6476

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The file contains an embedded OLE object, specifically identified as a Microsoft 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 Equation Editor vulnerability. This technique is commonly used to achieve arbitrary code execution.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/mdT.MOxDj 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` `a0986594a0995152716fdef416af18eb23469307e23a578bf21a67a22ef76c7e`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/mdT.MOxDj	2058752 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` `20a4043764217b5e66f2070b58a35bbd96c860e2e8dcf6d8dfa92613fdaba231`	ole-package	OOXML xl/embeddings/mdT.MOxDj Ole10Native stream: olE10nAtiVE	2039916 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

Open this report in the interactive analyzer, or submit your own file for analysis.