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

Static analysis result for SHA-256 2dcde0058a745abd…

MALICIOUS

Office (OOXML) / .XLSX

739.0 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300
MD5: b0473040d1529d47ac44f2d091a42b36 SHA-1: 1c00f10af6597e683debb8720d53285747241b39 SHA-256: 2dcde0058a745abdeed81a069051ae6fa44701a8ec7bc4219c90222bfb3186a0
120 Risk Score

Malware Insights

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

The critical heuristic firing for CVE-2017-11882 indicates that this Office document contains an embedded Equation Editor OLE object that is vulnerable to exploitation. This vulnerability allows for arbitrary code execution, likely to download and run a secondary payload. The presence of an embedded OLE object further supports this attack vector.

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/oleObject1.bin 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
42bb9799f7bd3983c140c54eade6cc5fff0e6576252f0b8e9ed374ebf835a1e1		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 1065984 bytes

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