Office (OOXML) / .XLSX malware analysis — malicious · 592e2de8355496f8

MALICIOUS

Office (OOXML) / .XLSX

704.6 KB Created: 2023-08-24 03:17:19 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-24

MD5: 09528f4f74b3dc9fa1be2c27164a35ef SHA-1: e20c1d2d6c5e19e1c5edcc3796b39030dc31e636 SHA-256: 592e2de8355496f8c20b5ce8e0a4d0ee4e523dd649741970278b52e7dc5084c3

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size and entropy, strongly suggesting it's being used to exploit a vulnerability like CVE-2017-11882. This technique is commonly used to deliver a second-stage malicious payload.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/Vo.Ynq5C 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` `3886ee517a8c0733395853899b4785e7604d3d35b26e728c0f72dfa9540dfd03`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/Vo.Ynq5C	1004032 bytes
`ooxml_oleobject_00_ole10native_00.bin` `fe90a433ebe761d3dadf6afda6192c88c6e20f2fceae4ec14ece842146fe541a`	ole-package	OOXML xl/embeddings/Vo.Ynq5C Ole10Native stream: olE10NatIve	993410 bytes

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