Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 71f1ca22eb18b443…

MALICIOUS

Office (OOXML) / .XLSX

723.3 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-10
MD5: b8f4093f10cd986ceb7cad48686c8a3f SHA-1: 1455887ecd08b544d9333c89d81e051a649fb83e SHA-256: 71f1ca22eb18b4439e4250f98eef990d4a4048fd4cd7648999e1939e8d6bcb3e
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The sample is an OOXML file containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This points to an attack pattern focused on exploiting client-side vulnerabilities to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/rmV.ZSG0FN 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.

FilenameKindSourceSize
ooxml_oleobject_00.bin
63b8b977fe2db00f87ab922f351a7ff123caa35c0141b7fc1371b54705b9aefc		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/rmV.ZSG0FN 1004032 bytes
ooxml_oleobject_00_ole10native_00.bin
2d845158fbb6b019bb05473ff58f253508340ccd3a0925b960c96ae3ffd769ef		 ole-package OOXML xl/embeddings/rmV.ZSG0FN Ole10Native stream: oLe10nAtIvE 993468 bytes

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