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

Static analysis result for SHA-256 7fbae225eb5d5b6f…

MALICIOUS

Office (OOXML) / .XLSX

17.9 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: 7c8243a5b0070156b0391c712026ab4b SHA-1: 3fcac62527c8a172ac403bc657337ff8012b6106 SHA-256: 7fbae225eb5d5b6f784309592bb7cc7505bcaf0a8bd71650ee38cf28e0e2adee
100 Risk Score

Malware Insights

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

The sample is an OOXML file 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, suggesting exploitation of this vulnerability for client-side execution. No document body or scripts were extracted, but the presence of the vulnerable Equation Editor object strongly implies 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
6521fc5da5232984c2c6fdd8378fd4ab300a63f5c15c532f37c5c4e8b5ae1fda		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
61b465939a80699b4819a56832ccf75732ecc178e416bb0c7789a603d9ae0e6b		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLE10native 1727 bytes

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