Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 5fcc30f4a0860802…

MALICIOUS

Office (OOXML)

21.9 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2019-01-12
MD5: dbd53146fc9fe07ad0b7ae8e49a85886 SHA-1: 9a82d3423d1719e960655c378ecdeffbc8913856 SHA-256: 5fcc30f4a086080270c53ef49ab4ce3a46fa29de69768efe82499a435ecd6d31
260 Risk Score

Malware Insights

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

The sample is an OOXML document containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate a critical vulnerability, CVE-2017-11882, is being exploited through a font record overflow within this object. The document also contains a lure to enable editing, a common tactic for macro-based malware. The embedded artifact was also flagged by ClamAV as malicious, confirming the exploit.

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: de2bdfda22d754bdea1f404a1c392d4b09c4314821a6cfe10eb1f2be58e66f2c
Detection
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0
Obfuscation or payload: unlikely

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