Malicious RTF — malware analysis report

Static analysis result for SHA-256 0845d215b329119a…

MALICIOUS

RTF

8.4 KB Authoring application: Riched20 6.3.9600
MD5: 8c832cb02a937c552873f17b9ba97e7d SHA-1: 03bc0d5f52ec880b4b93c32d211f9cfc44e73157 SHA-256: 0845d215b329119aa40487377395e7660d3cad2058403c49456c63916479906b
322 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object specifically identified as Equation Editor, which is known to be vulnerable to CVE-2017-11882. This vulnerability allows for the exploitation of a font record overflow to achieve arbitrary code execution. The presence of the ".objupdate" directive further indicates an attempt to trigger the OLE object's activation. The ClamAV signature confirms the exploit's presence.

Heuristics 8

  • 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 CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • Equation Editor object class critical RTF_OBJCLASS_EQUATION
    Object class 'equation.3' references Equation Editor
  • ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://urlz.fr/7vKC

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000100.bin
573badf287cca8f05b5a834d1bf4264415411c4c12672b4b07673837d112d0df		 rtf-objdata-decoded RTF \objdata at offset 0x100 3546 bytes

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