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

Static analysis result for SHA-256 7e2fc2c85360f8aa…

MALICIOUS

Office (OOXML) / .XLSX

19.2 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: eb1fcbc470f904f1a944e5144bbf3962 SHA-1: c11866025ab72deb5971090b806a9a689416a845 SHA-256: 7e2fc2c85360f8aac0306846e4c0680f89c790bc3e562e928f55c55915eaeec8
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 associated with CVE-2018-0798, a known vulnerability in Equation Editor that allows for arbitrary code execution. This suggests the file is designed to exploit this vulnerability upon opening.

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
55c3dad9842f0ff79bfce3cb98c16122b76d283e68faee8d5dfdbc867b314547		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
14f22554146d1e4b475ff51f7d98d3879bea218240a42ca7db3066ff06c1f2fc		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10nATIVE 1479 bytes

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