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

Static analysis result for SHA-256 8ff109bd3969fec4…

MALICIOUS

Office (OOXML) / .XLSX

846.4 KB Created: 2020-07-07 21:52:29 UTC Authoring application: Microsoft Excel 16.0300
MD5: 1b8e3a2d92dd98db56cc65d812fec060 SHA-1: 4e66edc506e4986d9f8590f10a52319c9c3e00ec SHA-256: 8ff109bd3969fec4af7d796f7fd34188e6495500ddddf985944802e5d02ae390
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an XLSX file containing an embedded OLE object that triggers CVE-2017-11882. The critical heuristic firing for the Equation Editor FONT record overflow indicates a clear attempt to exploit the vulnerability for remote code execution.

Heuristics 3

  • CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882
    Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/8YzKP4.yHG5x contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
0a3a4e7df64fcd0573ae02e0ed62d8e1191f9d65598839239f4571246582b1ee		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/8YzKP4.yHG5x 1051648 bytes

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