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

Static analysis result for SHA-256 f7824521fa09069c…

MALICIOUS

Office (OOXML) / .XLSX

164.9 KB Created: 2019-06-18 09:03:55 UTC Authoring application: Microsoft Excel 16.0300
MD5: d71d2da04cce1b3ea474e9e5827e6b69 SHA-1: 0b68836600c372933d035eaadc7de96f451f77a3 SHA-256: f7824521fa09069c426fb84f0a96ec7f070defa691c5699e2f265e5151d5a458
100 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate the presence of an anomaly associated with CVE-2018-0798, a vulnerability affecting Microsoft Equation Editor. This suggests the document is designed to exploit this vulnerability to achieve arbitrary 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
ab279433ff26c3f72ff805c832c97dd773485dcf62e8489419c7d001134f8337		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
5cd71e8b54a03acbf13e3cda09c8437758e81fd03cbd7efad854c9c7ed1b3c10		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 2011 bytes

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