Office (OOXML) / .XLSX malware analysis — malicious · 11d2ecce415e364f

MALICIOUS

Office (OOXML) / .XLSX

301.8 KB Created: 2019-05-27 22:54:04 UTC Authoring application: Microsoft Excel 16.0300

MD5: 0d770c9bacd8fd4cc70c3cb3a6841dbc SHA-1: 29d876eadfc17cf8b489e1603dbeb89974af2401 SHA-256: 11d2ecce415e364f430c3db0254f550c8327c8d63caf0334d2659c0eb308431e

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded OLE object, specifically identified as 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 the Equation Editor. This technique allows for arbitrary code execution on the victim's machine.

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` `8fd7860328c94b799ce617e0aae8e8b31d10b2f1a5c92d2160d4151a74e09e85`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	305152 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` `13d746387694a1344b42b6b4898a07e8e3fc4b2632a7f66d2d5f3997d180b0ac`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10nAtIVe	300527 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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