Office (OOXML) / .XLSX malware analysis — malicious · 56400378f785b93c

MALICIOUS

Office (OOXML) / .XLSX

1.57 MB Created: 2022-11-18 02:05:27 UTC Authoring application: Microsoft Excel 12.0000

MD5: 8f7baa745bd1f88d199a3e33a86e2cb1 SHA-1: 3865bcb3a8d22d65ff6dd2445e844d9a44bba072 SHA-256: 56400378f785b93c058c503ea504962fc9b4744814048c3b9967dee2fedca9fb

182 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an Excel spreadsheet containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object is anomalous and likely contains a malicious payload, exploiting CVE-2018-0798. The embedded object's structure and high entropy suggest it's designed to execute arbitrary code upon opening.

Heuristics 6

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/W2MX.GmJ 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.
Heap-spray pattern detected high SC_HEAP_SPRAY

Repeated 0x06 bytes found
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` `929e63f56884f402994beaaef3d6999a1766abd71c03ccf59923bd5708827bad`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/W2MX.GmJ	1945600 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` `61e52a2b0a971916b5cfdbc60f3ae1e872f9d9c69505642607f8a2eece3b6109`	ole-package	OOXML xl/embeddings/W2MX.GmJ Ole10Native stream: OLe10nATive	1928157 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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