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

Static analysis result for SHA-256 7cc456575974b71f…

MALICIOUS

Office (OOXML) / .XLSX

35.8 KB Created: 2021-12-06 14:45:17 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-04-28
MD5: 991315104b30004f8ca6591d53945c63 SHA-1: 91cc003cc70fc26e9d588d1f1b84ed4ac431da4b SHA-256: 7cc456575974b71f0d8b56c2a382ad8d9505b590032bd30f0aa4120c028199d3
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1559 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 CVE-2018-0798, an anomaly within the Equation Editor's native stream. This suggests the document is designed to exploit this vulnerability, likely leading to the execution of a secondary payload. No document body or script content was available for further analysis.

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
0a314817cc31784a460e2c7c0621147c0055faac16a704ec2b5e274cfaf00c7b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
1f5d827cffa5e2164b351efc63e15967de196870eba59ece017f111e799e96c7		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10natiVe 1588 bytes

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