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

Static analysis result for SHA-256 30dd7640f02734a7…

MALICIOUS

Office (OOXML) / .XLSX

21.8 KB Created: 2018-09-05 11:05:59 UTC Authoring application: Microsoft Excel 12.0000
MD5: 3975ad764fec4e2d86e6c2fbd9048697 SHA-1: dc82d42f36195ef7ea64c278db650c1d50663b5a SHA-256: 30dd7640f02734a767711193cff12b0de100a15180661ed64b7f5e6c8a7325a2
100 Risk Score

Malware Insights

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

The file is an Excel 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 in the Equation Editor's native stream, which is a known vulnerability 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
f741e9f96d060608e29db8a914c1561556dc68b1d4c0d261a1a6839870679e8c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
3a856a4e9ba324cd8e2e26438c4a60e87d9fe945a9ba0f8be981e2c45bdd24e6		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLE10naTIVe 1935 bytes

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