Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 02ff5d87c9b16a42…

MALICIOUS

Office (OOXML)

17.4 KB Created: 2017-05-03 05:29:29 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2019-02-10
MD5: 954092ee49b0c3090380946295185a5d SHA-1: c18dfee43bdf2cf269dbb1893caaf394692d088d SHA-256: 02ff5d87c9b16a42b3c98366ac8051044814b4cc9f7ce8d4d90e709a01425315
260 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object that exploits CVE-2017-11882 in the Equation Editor. The document body contains a lure instructing the user to 'Enable Editing', which is a common tactic to bypass macro security and trigger the exploit. The exploit is designed to execute a malicious payload, likely leading to further compromise.

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: d9df286176801c3c4240185c6769c7708f375806cc170a5a00f0f1c92cc2f113
Detection
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0
Obfuscation or payload: unlikely

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