Office (OOXML) / .XLSX malware analysis — malicious · e03d1c6d4dea0077

MALICIOUS

Office (OOXML) / .XLSX

1.86 MB Created: 2021-09-22 12:07:42 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-04-04

MD5: 05b78908c845502264fa2b1b574789e5 SHA-1: 70d7cfe88b3e3d5737917b0921052924ad98bfd4 SHA-256: e03d1c6d4dea0077f2892c024f0824a8e6a250858c35f762d2101eb9ec6d635e

142 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1559 Component Object Model Hijacking

The sample is an Excel file containing an embedded OLE object, specifically an Equation Editor object. High-severity heuristics indicate that this Equation Editor object is anomalous and carries a payload, strongly suggesting exploitation of CVE-2018-0798. The embedded object's stream 'Ole10Native' exhibits high entropy and a size mismatch, further confirming it contains malicious content. The file's purpose is to exploit this vulnerability to execute a payload.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/25tqEz.8qxrZe 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` `c3833e430244b5de7b139e41bbf4c5d9dbdd6783f5ce19213df6da0fca15fbdb`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/25tqEz.8qxrZe	2208768 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` `0a5ef6d82cf9f110b7de7a044a29974a3b2b9d2ac43913f435a2a2d9cf284b5d`	ole-package	OOXML xl/embeddings/25tqEz.8qxrZe Ole10Native stream: Ole10Native	2188915 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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