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

Static analysis result for SHA-256 9eb204119fa5ff98…

MALICIOUS

Office (OOXML) / .XLSX

13.1 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 16.0300
MD5: 459dfd5e4a5ea69e11a03f8fa7ada005 SHA-1: 23d2f65f4a4df91acee54c7d0e135d8c3129098b SHA-256: 9eb204119fa5ff984d18de7ab0c5ca985bc39f32d3d048884c5b77e69eb85a18
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1566 Phishing T1059 Command and Scripting Interpreter

The file is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate the presence of an anomaly associated with CVE-2018-0798, a known vulnerability in Equation Editor. This suggests the document is designed to exploit this vulnerability, likely leading to the execution of a secondary payload. No document body or script content was available for further analysis.

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.

FilenameKindSourceSize
ooxml_oleobject_00.bin
86e01a69012cd0acafacf90d37498a7cb8df2ee40256b7e8a816fb5ca701fc55		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4608 bytes
ooxml_oleobject_00_ole10native_00.bin
4a159c3a06075b250799784ba37e784c8ca7253c5f0d21ea7d6cc7eb9896869a		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10NATIve 2099 bytes

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