Office (OOXML) / .XLSX malware analysis — malicious · 1419092f2dbb0b12

MALICIOUS

Office (OOXML) / .XLSX

88.6 KB Created: 2021-02-03 07:57:22 UTC Authoring application: Microsoft Excel 15.0300

MD5: dfff4b8b16d490521b64b0da4f3c923b SHA-1: 06a310d37195e60e46b2d535342650169992e043 SHA-256: 1419092f2dbb0b12589923c0399c718c24387f6d99b501898814ba2ca360f6d0

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The file is an Office Open XML spreadsheet containing an embedded OLE object, specifically an Equation Editor object. High-severity heuristics indicate that 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 to achieve client-side code execution. No document body or scripts were extracted, limiting further analysis of the payload's specific actions.

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` `5a8cc4a8413406d4bc4cb9921b7243346a423a9fe9d376ae0c605bf6fe4f33e3`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	86528 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.94, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `6b085b660637e779d0e533f9cde4900370c1b91c066d76226bc2f22eb9379267`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10naTiVE	83079 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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