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

Static analysis result for SHA-256 493aace414685fd3…

MALICIOUS

Office (OOXML) / .XLSX

137.4 KB Created: 2020-07-07 21:52:29 UTC Authoring application: Microsoft Excel 16.0300
MD5: fb7adcd6ce7f35518ff9f73d182e957f SHA-1: 1b46c705927d2776f1d877f45c060e3de96e78b6 SHA-256: 493aace414685fd3efd852ba5dacabc2ed9ff8484a8cc7382fee7e4bb2416910
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office Open XML (XLSX) file containing an embedded OLE object. High-severity heuristics indicate this object is a Microsoft Equation Editor object with anomalies matching CVE-2018-0798, suggesting it is designed to exploit a vulnerability for arbitrary code execution. No document body or scripts were extracted, but the presence of the vulnerable Equation Editor object is sufficient evidence of exploitation.

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
09b36eef6ca1140877c761b00495964c1e0d9279ec1af74a62797cbcfc6a6385		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4608 bytes
ooxml_oleobject_00_ole10native_00.bin
7e1c162d836d720f3888052207e26c9d3d123bae13879965febef7e33af45f69		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10Native 2373 bytes

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