Office (OOXML) / .XLSX malware analysis — malicious · c4c24eb056243059

MALICIOUS

Office (OOXML) / .XLSX

664.4 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-20

MD5: da934aec1578872bae77e7b1817d873b SHA-1: 5d34963d15fe717916c213f96effdb49cb8058fb SHA-256: c4c24eb056243059da37e882d660db6e775af54b7ce316a3ade90605e108ba91

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file contains 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, strongly suggesting it's being used to exploit a vulnerability. This is a common technique for delivering second-stage malware.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/yvG8Z4.eFb 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` `f6127e91b2da232147a01587a9fa41690b393836e9aa916fcc5256ecd3ecad40`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/yvG8Z4.eFb	906752 bytes
`ooxml_oleobject_00_ole10native_00.bin` `341a78102abc155ca87ea553420677112bf5a82949b49a203b6dc9a134f8bf6f`	ole-package	OOXML xl/embeddings/yvG8Z4.eFb Ole10Native stream: OLe10NativE	897503 bytes

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