Office (OOXML) / .XLSX malware analysis — malicious · 64da972f4f55c99a

MALICIOUS

Office (OOXML) / .XLSX

657.3 KB Created: 2023-08-13 22:41:31 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-14

MD5: 80ca3a4cb52000b41d6305ed9e51c39e SHA-1: 552a9275db8b14ecc47d9855495aad34503d703d SHA-256: 64da972f4f55c99a66bd2b36f112d1680c4bc83462a440eb372d7392b5d1ec69

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an Office Open XML spreadsheet containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. This object exhibits an anomaly where the Ole10Native stream is unusually large compared to its declared size, indicating it likely carries a malicious payload. This technique is commonly used to exploit vulnerabilities in the Equation Editor to achieve arbitrary code execution.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/yt0pj0iiF.EB3Ql7y 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` `1625f354fe9910cfca9c68373864a39927df946ead8439fca483865af03e2664`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/yt0pj0iiF.EB3Ql7y	922624 bytes
`ooxml_oleobject_00_ole10native_00.bin` `0ba302a2f069b83312f8f5ed7e9c00138474dab1779682d090e90ae5ffe946a6`	ole-package	OOXML xl/embeddings/yt0pj0iiF.EB3Ql7y Ole10Native stream: oLe10NaTiVE	912437 bytes

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