Office (OOXML) / .XLSX malware analysis — malicious · ccdeee33da2f7bc2

MALICIOUS

Office (OOXML) / .XLSX

1.68 MB Created: 1996-10-14 23:33:28 UTC Authoring application: Microsoft Excel 15.0300

MD5: 36d653b35aca43fd29b1e757cdd19280 SHA-1: eca57556266fe5b8f6c908582b83b499c072f8b8 SHA-256: ccdeee33da2f7bc21f9d88840efb90854080daca17f167520f4b5984df2cf9c3

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is an Office document containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object is anomalous and likely carries a payload, exploiting CVE-2018-0798. The document body contains a lure instructing the user to 'ENABLE EDITING ABOVE' to view the content, which is a common tactic to bypass macro security. No scripts were extracted, but the presence of the anomalous OLE object strongly suggests it's designed to deliver a secondary payload upon user interaction.

Heuristics 6

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
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
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` `2002ac566c3aedf90b084e4c6c599f27d70457995b10bbce0529353c32a10e20`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	1753088 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` `a15b3bc8385e7c08c7f700736d1fad91b0bbe563f0422d7487220221f3c99abb`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10NAtIvE	1737084 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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