Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 6aef7fc91b011f29…

MALICIOUS

Office (OOXML)

14.5 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2019-05-31
MD5: a98d9a219e3abda7484254ea3fb1a916 SHA-1: 682d45020b655aab15603238d8f43ec9cb624c42 SHA-256: 6aef7fc91b011f2929272688ec464d817e4e55777d5726e7465181dcdd0f0b24
240 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate a critical vulnerability, CVE-2017-11882, related to a FONT record overflow within the Equation Editor. This exploit allows for arbitrary code execution upon opening the document, likely delivered via spearphishing.

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: a9b2d38536610190ad7457ffbbdffceb7d09f3b1410175a76f09584b82ff11cd
Detection
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0
Obfuscation or payload: unlikely

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