Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 350409575231a201…

MALICIOUS

Office (OOXML)

28.3 KB Created: 2010-02-14 08:32:05 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2019-06-27
MD5: 43036f9f014dec270ce2b6a136608aaa SHA-1: 3cef6ecd9514d37ba1b65c5946a3986156f2ca16 SHA-256: 350409575231a2013b64aa01b816e024222ac780bf35907f79b73527e1bb4362
240 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate a critical vulnerability, CVE-2017-11882, which is a known exploit for Equation Editor. ClamAV detections confirm this, identifying the file as Doc.Exploit.CVE_2017_11882-6934206-0. This exploit allows for arbitrary code execution, likely as part of a phishing attack.

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 4096 bytes
SHA-256: 455bc51492ad9d30cfbbedb69785273534df72d94c07ebd0feafb698917f52ac
Detection
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0
Obfuscation or payload: unlikely

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