Office (OOXML) / .XLSX malware analysis — malicious · 0f4c924827ea59c9

MALICIOUS

Office (OOXML) / .XLSX

704.7 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2024-06-06

MD5: 9178ae9484ff5806462801468cc7ee7b SHA-1: 5f4fe5825fad590e949a36b68a9107ea18c60d21 SHA-256: 0f4c924827ea59c9b0cb041624e0757a95339d426e23ab0476150330c3a72c67

100 Risk Score

Malware Insights

MITRE ATT&CK

T1559.001 Component Object Model T1204.002 Malicious File

The file is an OOXML document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size and entropy, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. The document body presents a fabricated invoice or order, likely a lure to trick users into opening the malicious content.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/7Ek.qJyH6 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` `125fd581e5936038d1c952bbecea822f620446344f46f26a01dfdcb065f6a043`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/7Ek.qJyH6	1027072 bytes
`ooxml_oleobject_00_ole10native_00.bin` `a923244373bbe978dc926b6977b85809dff07209e2962a52eeda731160027901`	ole-package	OOXML xl/embeddings/7Ek.qJyH6 Ole10Native stream: OLE10NATIve	1016710 bytes

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