Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 14c3c07d79dbeaef…

MALICIOUS

RTF / .DOC

8.4 KB Authoring application: Riched20 6.3.9600
MD5: 136d28a8985dfb881fb9fc1578e78fb0 SHA-1: 6fec332d9e70cd3877d3ef31786fb03e9c49e44b SHA-256: 14c3c07d79dbeaef86026a6bbddc2f87919d02a4d6590146e911c53b69a21e3b
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, triggering critical heuristics for CVE-2017-11882. This exploit is known to allow arbitrary code execution. The embedded URL likely serves as a C2 or payload delivery mechanism for the exploited vulnerability.

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://185.212.44.87/abc

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000000e9.bin
5fcb9019bbd8467c90eb5164069b066f3174c15ceeeb0fd60eb30d7454b8a317		 rtf-objdata-decoded RTF \objdata at offset 0xE9 3546 bytes

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