Office (OOXML) / .XLSX malware analysis — malicious · c8aaa595d55d244e

MALICIOUS

Office (OOXML) / .XLSX

8.7 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300

MD5: fd62a2489a4aaa7d9b4ac646eaddc9c3 SHA-1: b213f2a2bd93e89935407b0a5897cff132c8ecd5 SHA-256: c8aaa595d55d244e2cba395ba21c4efcab6b200d052e9a0e3e667e49e1feea53

100 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded OLE object that triggers CVE-2018-0798, a vulnerability in the Equation Editor. This indicates the file is designed to exploit this specific vulnerability for arbitrary code execution upon opening.

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` `29a15ae74f37337496852c3516ace3877ed172a40b41228b49e730eeee30f490`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	4096 bytes
`ooxml_oleobject_00_ole10native_00.bin` `110dbc3eadcce77759f4caad36c4a1abb6944912aa3d15944f026ca85553a33d`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10NAtiVE	1560 bytes

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