Office (OOXML) / .XLSX malware analysis — malicious · 3b94f6ac851ed914

MALICIOUS

Office (OOXML) / .XLSX

1.99 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-02-21

MD5: 6e1ddc7545240099c781aed63295cf30 SHA-1: da2c92999761cfe0f0d01ce6f18f2c90a2f895eb SHA-256: 3b94f6ac851ed9141b050f6f1096af9c5011de29fc67bdf8608182a47f88ac10

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The sample is an Excel file containing an embedded Equation Editor OLE object. Heuristics indicate this object is anomalous and carries a payload, specifically triggering CVE-2018-0798. This suggests the file is designed to exploit a vulnerability in the Equation Editor component to execute arbitrary code. The embedded artifacts, including the Ole10Native stream, are indicative of a malicious payload delivery mechanism.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/lfPbh.QpW 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` `fdb90d0dff028ae4d173a7a97e5ec308e81e5b3a84685246b6e0cfafd0d58c8a`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/lfPbh.QpW	2112000 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` `fc10ce536c4023ffe0f76fc287828cc5660dbf751cb5f82a6f3bf6d457566836`	ole-package	OOXML xl/embeddings/lfPbh.QpW Ole10Native stream: olE10naTiVe	2093047 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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