Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 6b8b7fdb611c3a33…

MALICIOUS

Office (OOXML)

9.2 KB Created: 2019-02-12 14:07:58 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2019-02-26
MD5: f8315f956931a4e7f06a1f67eacaedcc SHA-1: 4741bb5bafba1fd1bf298cd0383e90c1857f8a0b SHA-256: 6b8b7fdb611c3a337760f79d11a40f7e6099e7e1399eeba8ebd03549b8ab26f8
240 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an OOXML file containing an embedded OLE object, specifically identified as an Equation Editor object. Critical heuristics indicate a successful exploitation of CVE-2017-11882 through a FONT record overflow within this object. This vulnerability is known to allow arbitrary code execution, making it the primary attack vector.

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: 0985d3902154a11d5ec5528c608a668378837fd29db54e4a5044bc15e78ba5d9
Detection
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0
Obfuscation or payload: unlikely

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