Office (OOXML) / .XLSX malware analysis — malicious · ff7eab60677d5457

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: d605ac3af2f2df976d97079ad4403230 SHA-1: a0418b45d8b5d26f4df1b773276983c969ca04b6 SHA-256: ff7eab60677d54572eecafca54c450d04aa49462ec7f71f44f0af67268ae8312

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 OLE object, specifically identified as a vulnerable Equation Editor object. Heuristics indicate anomalous native stream data and high entropy, strongly suggesting it's designed to exploit CVE-2018-0798. This exploit likely facilitates the execution of a secondary payload, though no scripts were directly extracted.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/rcOqG.Me 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` `f8b3e55f80e9ed743fee2c48b405fac146c5fee940b371c435567a13f541e048`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/rcOqG.Me	1884160 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` `67b660f1d4e9a233c68bf5230e3b7753f276ed0b401d3a7bca69531e479618ba`	ole-package	OOXML xl/embeddings/rcOqG.Me Ole10Native stream: OLe10NatiVE	1867055 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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