Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 77f59687cd6f81fb…

MALICIOUS

Office (OOXML)

62.7 KB Created: 2018-09-09 12:27:30 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2019-08-04
MD5: 0e5dcdfc8b63f1cd9eb1d967516a813d SHA-1: 16d306f425cd89707a185d4dda92e8f10f45f202 SHA-256: 77f59687cd6f81fbd643a38d4e00d094c6e901c7e1352d06bb68a35ee915401a
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 CVE-2017-11882. This vulnerability is known to be used for arbitrary code execution. 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: 7d45bf7ae1d33cfada04011e1faa08868fc65b8eb2ddf72f9af2af8e307f8e50
Detection
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0
Obfuscation or payload: unlikely

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