Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 cf244ef096d1779a…

MALICIOUS

Office (OOXML)

10.6 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300 First seen: 2018-10-13
MD5: 39701513a6aaf46a02f7a1d945c71a92 SHA-1: 18961c338b60a465b91bf251a38b52ef8e90c6ce SHA-256: cf244ef096d1779ad68dc6d85f0216a9512877d5d05b1e5d8fdc4e2bd6f7aa26
240 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object that exploits CVE-2017-11882 via a font record overflow. This vulnerability allows for arbitrary code execution, likely to download and run a secondary payload. The document body appears to be a disguised purchase order, a common lure for phishing attacks.

Heuristics 4

  • 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

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 4608 bytes
SHA-256: f03db8bf62c3a8d4bc6ee400825f795d0b1f95bed56c3d41804f89068047b5f0
Detection
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0
Obfuscation or payload: unlikely

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