Office (OOXML) / .XLSX malware analysis — malicious · 922e45b7be339917

MALICIOUS

Office (OOXML) / .XLSX

1.60 MB Created: 2021-02-03 07:57:22 UTC Authoring application: Microsoft Excel 15.0300

MD5: 19bb226187d7ab31d86d547f1fbac46d SHA-1: 1f80563bd5577e8e6b9004aeb3b5a4548f3ce856 SHA-256: 922e45b7be33991767707260643b45dd2fcf38391455139f0f63bc43a7237249

142 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: User Execution T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model

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 likely contains a malicious payload, exploiting CVE-2018-0798. No document body text or scripts were extracted, but the presence of the exploit within the Equation Editor strongly suggests a user-execution attack pattern.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/VVR.zi6 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` `9cbdab88130d5abf28e4be4c58d0b115d4cab2ac1bb6b4365b964568bbec5adb`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/VVR.zi6	1905152 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` `6fa9815d4e5e41edc7b90689c2da5d8858e6c49eac9fc997737ccda3d9e1ab9b`	ole-package	OOXML xl/embeddings/VVR.zi6 Ole10Native stream: oLe10NatIve	1887587 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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