Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 276783c6d0428992…

MALICIOUS

Office (OOXML)

81.4 KB Created: 2018-09-28 04:05:01 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2019-01-12
MD5: 1766eecf00459ab7e54c5c0bb0e6eaf2 SHA-1: 596e44be19737c5685c04d0bafeb9b062324d3ef SHA-256: 276783c6d04289929aad98ef0a31585f09ccb7e816c8ad2bb6752e42aa4341d0
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate the presence of CVE-2018-0798, a known vulnerability affecting Equation Editor. This suggests the document is designed to exploit this vulnerability for client-side code execution.

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 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
SHA-256: c46d31bcbaadc9d4eb299675761414c8e68bd9b26b67f9f4addadc4e7dabc421
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLe10NATIVE 1777 bytes
SHA-256: 1976e89df3d68ea84274c5c8b692a071b99336d70dd3d2178a9b4b30e1d207a6

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