Office (OOXML) / .OLE malware analysis — malicious · 09a0d6a0c441837e

MALICIOUS

Office (OOXML) / .OLE

288.8 KB Created: 2021-02-04 16:08:42 UTC Authoring application: Microsoft Excel 16.0300

MD5: a66837156332ebad5434c42b8b9624da SHA-1: 9dc4132c481c0e4cc94924882d77496e5e6c612c SHA-256: 09a0d6a0c441837ea7422cd4ed81d634b7a765be9549802263b35148fe02f3e9

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The file contains an embedded OLE object, identified as an Equation Editor object. Heuristics indicate this object is anomalous and likely carries a payload, exploiting CVE-2018-0798. The embedded OLE object and its native stream are the primary indicators of malicious activity.

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` `d58248f1b2fef0999ddfcced25ce85045b922ada69d94734c28b5e9cf2b86e57`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	286720 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `41e30cae881df76dc3e57bd9bf4d4b4748cee23a5a00af456a1668263112ba08`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10nAtiVe	281815 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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