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

Static analysis result for SHA-256 65b5d7e5d9e1970f…

MALICIOUS

Office (OOXML) / .XLSX

12.8 KB Created: 2020-07-09 10:28:27 UTC Authoring application: Microsoft Excel 14.0300
MD5: 689d07e28639ba2efd5352045ac52efe SHA-1: da884e60337f7431378f2d0c80f0c22efbf3501f SHA-256: 65b5d7e5d9e1970f75958b0f8f97eb3f319ac9a165161e633a7952c7dfcd4dcc
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel document containing an embedded OLE object, specifically an Equation Editor object. High-severity heuristics indicate the presence of CVE-2018-0798, a vulnerability in the Equation Editor that allows for arbitrary code execution. The embedded OLE object is the likely vector for exploiting this vulnerability.

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
b5d6bd5057d85241c148298d1c5fdd9ad1940adc4ebb055e98ed3345aa923aea		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
d24c7f65cdf60a1acb4465da063dfb955291f0f4a78b87aa3a691901749d2ff7		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10NaTive 1863 bytes

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