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

Static analysis result for SHA-256 ca269fbd3e7f5ba0…

MALICIOUS

Office (OOXML) / .XLSX

517.3 KB Created: 2020-01-20 17:22:23 UTC Authoring application: Microsoft Excel 15.0300
MD5: 789b685cfae0555a29deeece693ab9df SHA-1: 51ec2377f172c2f57e1da81532fc0338a88304c0 SHA-256: ca269fbd3e7f5ba0633c93bd298c37e7033c35c5c7a5c557df126e0048375134
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File Execution T1559 Component Object Model Hijacking

The file is an Office Open XML document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate the presence of an anomaly in the Equation Editor's native stream, strongly suggesting exploitation of CVE-2018-0798. This vulnerability allows for arbitrary code execution when the embedded object is accessed. The document body content appears to be a list of shipping companies, likely a lure to encourage opening the document.

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
f70edf30021e14802a250bb69e67313312cb8dc5385bb3772399bb79a10b41bf		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
5f8a29f572e889ae906ea6b06247830724fc4c270bda7ce1edcbb3eab2f2c125		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10naTIve 1529 bytes

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