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

Static analysis result for SHA-256 ca91a8dd6f50202c…

MALICIOUS

Office (OOXML) / .XLSX

137.2 KB Created: 2020-07-07 21:52:29 UTC Authoring application: Microsoft Excel 16.0300
MD5: 5f3db9966be47ccf21dc3c4e536d7976 SHA-1: 9d1dd52f48ad6acf9cad62fb46a477340742e3b0 SHA-256: ca91a8dd6f50202cdc5ed444cb1c1f447f2dc108f2c276658f337c93259fb1ce
100 Risk Score

Malware Insights

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

The file is an Office Open XML (XLSX) document containing an embedded OLE object. High-severity heuristics indicate the presence of an Equation Editor OLE object with an anomalous native stream, specifically triggering the CVE-2018-0798 detection. This suggests the document is designed to exploit this vulnerability for initial 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
0034a02d6b6f750959f1eab22f726f8dfc89e4800f71c9b256652d746368ab7b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
98bab209d87b71e5087d01f2ea03763a95333429a3ce4a25dede65730e0eeb9d		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10natIvE 1993 bytes

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