Office (OOXML) / .XLSX malware analysis — malicious · 0af44ef44839777f

MALICIOUS

Office (OOXML) / .XLSX

1.49 MB Created: 2022-11-18 02:05:27 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-11-22

MD5: fe3a9a20b9c5c5c0084256df2192ba1d SHA-1: 3ede00f41ab97dead756214a12e90c62f860da70 SHA-256: 0af44ef44839777ff169cad5c93d5a8bf07f2cd39748c4902d1a29b4fe59ad6f

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The XLSX file contains an embedded OLE object, specifically identified as a Equation Editor object. This object carries a payload-like Ole10Native stream with high entropy, indicating it's likely a secondary stage. The presence of these elements strongly suggests exploitation of a vulnerability within the Equation Editor component to achieve arbitrary code execution.

Heuristics 4

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/Y0o.vge0Gsa contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
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` `f542243f795c5234505fd4f1922ddf8a69b3569c6cd698b61510c91aab900d35`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/Y0o.vge0Gsa	1815040 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` `0f7288b2fdb5d7e37bf061e69f4c0d34b048c960286926311d88a3e5cc39ce72`	ole-package	OOXML xl/embeddings/Y0o.vge0Gsa Ole10Native stream: oLE10NatIve	1798408 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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