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

Static analysis result for SHA-256 fcfc827205cd38cd…

MALICIOUS

Office (OOXML) / .XLSX

10.6 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 80046cece7ef2ce9371f8089c92a05c0 SHA-1: 5bf046cdc8002b53f34ee7a8c20890722bf0b968 SHA-256: fcfc827205cd38cdf997f72b1d58eba51ac12da6ba5939279b626522b11fd938
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office Open XML spreadsheet containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate the presence of an anomaly related to CVE-2018-0798 within the Equation Editor's native stream, suggesting exploitation for arbitrary code execution. No document body text or scripts were extracted, but the presence of the vulnerable OLE object is sufficient evidence for this assessment.

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
99724e942fb5dfaed75e8ad5e3130b027b9cf6b381066eded97ca5c5f8c36736		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
8314773fe103d06ff55dc08317c79c19497b54178f416dd524f20aed7a5898cd		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLe10natIve 1842 bytes

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