Malicious RTF — malware analysis report

Static analysis result for SHA-256 5e4e1ad35fceadbe…

MALICIOUS

RTF

8.4 KB Authoring application: Riched20 6.3.9600
MD5: d01daa04d328716da5a7126ffd5a6a20 SHA-1: 7c5abe9200a540247cfa42dab7fb036811800204 SHA-256: 5e4e1ad35fceadbe81ca96412fd9a7ad0493810067d2d9bb4470d49ac33dc964
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 execution of arbitrary code when the object is activated, likely through a ".objupdate" directive. The presence of ClamAV detection for Rtf.Exploit.CVE_2017_11882-6584355-1 further confirms the exploit's nature.

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/7t3f

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000100.bin
b5715ad84b01020ac6250a7edb2784ef0e56fb91434e69125c12452f3d7d7976		 rtf-objdata-decoded RTF \objdata at offset 0x100 3546 bytes

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