Office (OOXML) / .XLSX malware analysis — malicious · 018f109f476bdf14

MALICIOUS

Office (OOXML) / .XLSX

673.9 KB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-07

MD5: 94fbb88348c29d1f10423a83a94e4ae3 SHA-1: 21873b61634a8b302b3686fcc4786f816eff5d28 SHA-256: 018f109f476bdf144dcf2716f5e40292c7bbc0dae3475b13a91bf0f9f0c1faa7

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an Excel document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the stream size, strongly suggesting it's a dropper or exploit container. The document body content appears to be a fabricated purchase order, a common lure for phishing attacks.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/el7t8DKr.LuObQKN 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin` `8c5f81d87cbd57b2dedf7a3ad36e631892d4bf82c48968bf2d707fd16dac049c`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/el7t8DKr.LuObQKN	977920 bytes
`ooxml_oleobject_00_ole10native_00.bin` `909fd349cd0f62fcc5670f5bbe651b6b9d82599116e4bd3c792922d834132b31`	ole-package	OOXML xl/embeddings/el7t8DKr.LuObQKN Ole10Native stream: Ole10NAtIve	968033 bytes

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