Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 4ff6e03b4fd2d859…

MALICIOUS

Office (OOXML)

9.9 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300 First seen: 2019-05-31
MD5: 6af60cebd09a7b2ca786ff6445848902 SHA-1: 5ad5fa62d6ee61d22efd3b90cfc1088fee7aa806 SHA-256: 4ff6e03b4fd2d859621d4627b2f149ee772d7e000769bd6e00e6f1b1527967ed
240 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an OOXML document containing an embedded OLE object, specifically identified as an Equation Editor object. Critical heuristics indicate the presence of the CVE-2017-11882 vulnerability, which is exploited via a FONT record overflow. This vulnerability allows for arbitrary code execution.

Heuristics 4

  • 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.
  • ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.CVE_2017_11882-6934206-0
  • 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 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
SHA-256: e9dcbf1c60fba549d9c52ffc5614c32f1bea1d6f666ff0c562efc6dabbd99177
Detection
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0
Obfuscation or payload: unlikely

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