Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 1db9bb8f01579739…

MALICIOUS

Office (OOXML)

14.1 KB Created: 2011-03-22 06:52:17 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2019-05-16
MD5: 165631ab1b96b48cc035110098ae1001 SHA-1: 345485985b077f42adc1dfb21a4cd7287a181d71 SHA-256: 1db9bb8f01579739e0a9c5c78ddb8a154e4d3002fe8e8628b65f681c11a4a931
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 OLE object that exploits CVE-2017-11882 in the Equation Editor. This vulnerability allows for arbitrary code execution, which is a common method for delivering secondary payloads. The document also contains a lure to enable editing, further supporting its malicious intent.

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 3584 bytes
SHA-256: 076ee6ff6a966cf383933566ed9e950be25c0264010c1c90030466156a51eb1c
Detection
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0
Obfuscation or payload: unlikely

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