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

Static analysis result for SHA-256 35fe4d13edb8fcf5…

MALICIOUS

Office (OOXML) / .XLSX

8.4 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: 0ab444908d3909a9f779759b1de424a9 SHA-1: df1267a71bd09480c03f354fd4b7f08a68fddf56 SHA-256: 35fe4d13edb8fcf545858fe817a21df4cee10abb4320014384f7096f6e05b814
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, which allows for arbitrary code execution. No document body text or scripts were provided, but the presence of the vulnerable Equation Editor component strongly suggests an exploit attempt.

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
716f896059af6ab1c40d7a5fd681fe618580e49368c70b14371317afb89b1938		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
b3fa8beee31e497f97d60809d93da68713b7c723b8c6948e26a2e9ec5a20966f		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10NatIVe 1440 bytes

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