Office (OOXML) / .XLSX malware analysis — malicious · 3b13f9a72b2714aa

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: e797b7354cce686d9516e3b8137b6f49 SHA-1: 48484056b9cb703cca509fa2bb6be1114434f9cf SHA-256: 3b13f9a72b2714aa34f33113d62e32b564160d7069e4426b95886d79a59bfc9c

142 Risk Score

Malware Insights

MITRE ATT&CK

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

The file contains an embedded OLE object, specifically an Equation Editor object, which exhibits anomalies indicative of CVE-2018-0798. This suggests the file is designed to exploit this vulnerability to execute a malicious payload. The embedded artifacts, including the OLE object and its Ole10Native stream, are suspicious and likely contain the exploit or secondary payload.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/KpYt.68 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` `6dba8d70656e1492a7112b6a82482e9c8991ba5594d8ea9e185bd067742f1b00`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/KpYt.68	2223104 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` `0e0f4b6e63d7c9e825bf1f77f6072b27d96eaca44e69c704c6493c1be41e57fa`	ole-package	OOXML xl/embeddings/KpYt.68 Ole10Native stream: OLE10natIVe	2203317 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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