Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c12c36f5f688ef3a…

MALICIOUS

Office (OOXML)

14.5 KB Created: 2011-03-22 06:52:17 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2019-03-10
MD5: 8e97d70fdc019809b61ca1b0a9f9ee53 SHA-1: 375361d7600f6355641d6f21cb14b7ce5b0fb42b SHA-256: c12c36f5f688ef3a72bd5acd2decd47bbbd0b7af9955144b00d8ed3c88eca194
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 OLE object that exploits the CVE-2017-11882 vulnerability in the Equation Editor. This vulnerability allows for arbitrary code execution, which is a common method for delivering secondary payloads. The document also contains a lure instructing the user to 'ENABLE EDITING' to bypass macro security, further indicating malicious intent.

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: b187a1d269b8cec66e3aa07644d1c39ab82ed4d9cd85777d6dd0272edb341dfd
Detection
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0
Obfuscation or payload: unlikely

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