Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c5cefcd5740affe5…

MALICIOUS

Office (OOXML)

58.2 KB Created: 2018-09-10 20:03:07 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2019-01-12
MD5: 3da534e59a3c3a95b74bf8eaf7c063b3 SHA-1: 3273e121c93de9dd5d04744fec2b4621b3a33e02 SHA-256: c5cefcd5740affe58a988e549874e23362a42856c6583790005f55b58b037bf7
260 Risk Score

Malware Insights

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

The file is an Office document containing an embedded Equation Editor OLE object that exploits the CVE-2017-11882 vulnerability. This vulnerability allows for arbitrary code execution, and the presence of the OLE object strongly indicates an attempt to exploit it. The document also contains a lure to enable editing, which is a common tactic for macro-based malware.

Heuristics 5

  • 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

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: a4fdf7b43573c2d88b7ca6ee63f603b806679b5f10c39d27b94175acea6a0e93
Detection
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0
Obfuscation or payload: unlikely

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