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

Static analysis result for SHA-256 eedf190c0d1619c7…

MALICIOUS

Office (OOXML) / .XLSX

21.5 KB Created: 2018-09-05 11:05:59 UTC Authoring application: Microsoft Excel 12.0000
MD5: ae3adf340b75a0b16a32510fe44ec4ad SHA-1: 396d971ddb50a3cf89b9caa2fc9de39cc1ed8cc9 SHA-256: eedf190c0d1619c79d99ba63b02dcf6573e0c027350ac7271d8449d3cc5721ea
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1559.001 Component Object Model Hijacking

The file is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate the presence of CVE-2018-0798, an anomaly within the Equation Editor's native stream, strongly suggesting exploitation. This technique is commonly used to deliver secondary payloads. No scripts were extracted, and the document body contained mostly numerical data and tabular headers, providing no further context on the specific lure.

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
c87597d1a4bed648f3474a53b291c5c2bd16f7d47fb30645c8778c06ec33126a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
2a62bde188a7ce8b5b6ab395085a384403aebd9327c3f4d90ff0d9c06a56bef8		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OlE10natIve 1510 bytes

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