Office (OOXML) malware analysis — malicious · 4aa3fa77e7011960

MALICIOUS

Office (OOXML)

8.7 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300

MD5: 2062110250fba913e17e1bb7f822b2e5 SHA-1: 22327bfccd7177f85e5fd2c14acb757527abbe1f SHA-256: 4aa3fa77e7011960e1869fc942bf481ef96fef9f24bedbecd804e071612e8f9c

100 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is a malicious Excel document containing an embedded OLE object that exploits CVE-2018-0798 in the Equation Editor. This vulnerability allows for arbitrary code execution when the embedded object is activated. No further payloads or network indicators were extracted from this specific file.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/oleObject1.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY

Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
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` `409ad77ab9f9239efe582e538728d33b87a0fdc51ce3890736a7dc21b6d0fcb3`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	4096 bytes
`ooxml_oleobject_00_ole10native_00.bin` `996e7656cb6486bdbbc63a382532f0df8851ab9c49410fa41ad7bba5d8b07fff`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OlE10nAtiVE	1734 bytes

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