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

Static analysis result for SHA-256 82a6bc0c91753e50…

MALICIOUS

Office (OOXML) / .XLSX

31.9 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 16.0300
MD5: 63b97dbab59d86e9504c32e1a30e9990 SHA-1: 778dc6209e3e791cf82fc7e56bc97673a6574e3b SHA-256: 82a6bc0c91753e50d86d70e628559aa98d59ce8d18a54c0096dc4d61570c7313
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel spreadsheet containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate the presence of CVE-2018-0798, a vulnerability associated with anomalous Equation Editor native streams. This suggests the file is designed to exploit this vulnerability to achieve 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
d1cab3b87b740f776ee7fa72493bbc12f594e0157123ee8477639f39f8af0bdc		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
4331fc7e0b2d1c4268a49ee3f7fef38e95a8ec955ee46b3b2ff3cb578e254b58		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OlE10naTIve 1731 bytes

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