Office (OOXML) / .XLSX malware analysis — malicious · f1d6620d62d354c6

MALICIOUS

Office (OOXML) / .XLSX

1.15 MB Created: 2022-11-18 02:05:27 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-03-08

MD5: 73d228e82524b72ad95b64b040dd1a1f SHA-1: 8fec94210f31e82019e06baf8d865b20f25116a6 SHA-256: f1d6620d62d354c6a34c82f975579cb0a3beeaf5539d5a5993f9c470d2616a59

142 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking T1059 Command and Scripting Interpreter

The file is an Excel spreadsheet containing an embedded OLE object, specifically an Equation Editor object. High-entropy anomalies within the Equation Editor's native stream indicate it is being used to deliver a malicious payload, likely exploiting CVE-2018-0798. The embedded object and its anomalous stream are the primary indicators of malicious activity.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/z8I1.BgSWc 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` `58db6bd072da1d148a4c621180ed86b5df3dd0b7c7cc46e266188694ee6a73a4`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/z8I1.BgSWc	1446400 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` `0a1c4bfcdb7c980f7d24e6b0140828a58b695422afd08d755a8af1a138188914`	ole-package	OOXML xl/embeddings/z8I1.BgSWc Ole10Native stream: OlE10natIVE	1432317 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.97, consistent with packed or encrypted content.

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