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

Static analysis result for SHA-256 7d4df1a034fe7622…

MALICIOUS

Office (OOXML) / .XLSX

12.2 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300
MD5: 7ee45226bd883b675f12900e54816e4c SHA-1: 1016a67302ce5ada06820d9ef01b193d40289b91 SHA-256: 7d4df1a034fe762252b9762c13c20c0edb391feea46a691043df805e1b957c02
100 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798 due to anomalous Equation Editor native stream properties. This suggests the document is designed to exploit this vulnerability to execute arbitrary code, likely leading to a secondary payload download or 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
cea6504bc4b88d099c9ff9abf8c98c489db585c23438b5ed8494c79f27fceb7b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
2b76a6b324c2ce14497bd53cea3da579460e5a41e85e5e50824a93267aee2aa0		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10NATiVE 1413 bytes

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