Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 3a81f958a1f17453…

MALICIOUS

Office (OOXML)

9.6 KB Created: 2018-09-23 21:02:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2019-05-31
MD5: 13fea0387ed146e44870bbb0be94138d SHA-1: 111bf123013814e718d5479e7e6a3c712bbbf679 SHA-256: 3a81f958a1f17453a83e57197def80f48c77d85bcdde6494e7bb81ed9886f265
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 that exploits the CVE-2017-11882 vulnerability in Equation Editor. This vulnerability allows for arbitrary code execution when the document is opened. The document body text is generic and does not provide further context.

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 4608 bytes
SHA-256: 0bb26a7517f7afc36644ef5d37c8f16498c176c134facef806202bfa500bfc13
Detection
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0
Obfuscation or payload: unlikely

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