Office (OOXML) / .XLSX malware analysis — malicious · b704c2d0fc6fa429

MALICIOUS

Office (OOXML) / .XLSX

690.3 KB Created: 2023-08-28 22:59:08 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-29

MD5: 6af3aa7b7216f0ceca32c5936883a752 SHA-1: 46ad16c84630998435669ec61ed708cb810eaa9a SHA-256: b704c2d0fc6fa42973d42f6e0b86a89f2373faf8ee5619204c903d740689f526

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File T1027 Obfuscated Files or Information

The file is an Office Open XML 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 header, suggesting it's being used to exploit 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/GAY.pXa4Ar 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` `39b1307dddd862e13ad4d154d42bac860056144ab55b2a7c164e9ba7f43d0408`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/GAY.pXa4Ar	1026048 bytes
`ooxml_oleobject_00_ole10native_00.bin` `17ab253b4af28d17a61b6a9a50af1bdda29e52e736ffe29118ab3888ccc3a478`	ole-package	OOXML xl/embeddings/GAY.pXa4Ar Ole10Native stream: oLE10nAtIVE	1015370 bytes

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