Office (OOXML) / .XLSX malware analysis — malicious · b6adf82dc2b9784c

MALICIOUS

Office (OOXML) / .XLSX

646.4 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-25

MD5: a0feb4143db170069059f1c74732b611 SHA-1: 51123a56207bcf354a20eadfaececbba9e00f931 SHA-256: b6adf82dc2b9784ca98e7e33998c3fab1307f1078bb5ee9431a02d43ced7c3bf

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an OOXML document 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 header and size discrepancy, strongly suggesting exploitation of a known vulnerability. This technique is commonly used to deliver second-stage malware.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/u0brn8.5jpq 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` `a3b1d339537285540d544b34575e288e9c5ebccc67b532f8f85ba5b362a4fb4f`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/u0brn8.5jpq	948224 bytes
`ooxml_oleobject_00_ole10native_00.bin` `78d0380ac6799a518ee10df006b8f49a371f61858e0cf90040bc1af0d8029c70`	ole-package	OOXML xl/embeddings/u0brn8.5jpq Ole10Native stream: Ole10NatIVe	938377 bytes

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