Office (OOXML) / .XLSX malware analysis — malicious · ddeb90ad7257d645

MALICIOUS

Office (OOXML) / .XLSX

1.35 MB Created: 2022-09-30 00:41:36 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-10-27

MD5: 975f7651674b3906d4f40572e12d11fb SHA-1: aa0e1e899ded0ef23ce978b818be0894a2da7ee7 SHA-256: ddeb90ad7257d64580c41776e294c3e408156cb3545cd99cf02532e9bdb9c311

142 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: Malicious Attachment T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model and Distributed Component Object Model

The file is an Excel spreadsheet containing an embedded OLE object, specifically an Equation Editor. Heuristics indicate this object is anomalous and likely exploits CVE-2018-0798, carrying a payload within its Ole10Native stream. The high entropy and size anomaly of the Ole10Native stream further suggest it contains malicious code. No document body or scripts were extracted, but the OLE object's structure strongly points to a file designed to exploit this vulnerability.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/BH6jJ6El9.RmOiPf 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` `1cddc87ef103d9ed6d09d7de7d2c5f17edb9fa779cb0daafc3c07ffd63806787`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/BH6jJ6El9.RmOiPf	1688576 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` `9deb53dbb90fbdd3d89cd49be82a548521630bb52d32b40a9b8687181f05ddf4`	ole-package	OOXML xl/embeddings/BH6jJ6El9.RmOiPf Ole10Native stream: OLE10nAtIVE	1673049 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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