Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 45e60eb915b0f0e8…

MALICIOUS

Office (OOXML)

13.2 KB Created: 2017-06-09 10:03:31 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2019-08-04
MD5: cf79691f509850f61183f5ed04452949 SHA-1: c6b8af0a45b275339a16e5d50050a688c2491ccd SHA-256: 45e60eb915b0f0e88ae418524c2c1a7d40632c323953f08bfde3959c5cb1ac6f
240 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an OOXML document containing an embedded OLE object that exploits the CVE-2017-11882 vulnerability in the Equation Editor. This vulnerability allows for arbitrary code execution when the document is opened. The document body is a fake purchase order, likely a lure to entice the user to open the malicious file.

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 4096 bytes
SHA-256: 26797c01a8f3fd55d502bde0fea6f3a4350750d768911688685ef804087b838f
Detection
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0
Obfuscation or payload: unlikely

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