Malicious RTF — malware analysis report

Static analysis result for SHA-256 8f7f608a4104f2e9…

MALICIOUS

RTF

8.0 KB Authoring application: Riched20 6.3.9600 First seen: 2022-08-08
MD5: d82341600606afcf027646ea42f285ae SHA-1: 8e908d310a712547cefddd3a1ff6e6fdb7879ff3 SHA-256: 8f7f608a4104f2e9952f0bde07bb17187758fea0d0c53ded45cd537758c045a9
322 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains an embedded OLE object that exploits a known vulnerability in Microsoft Equation Editor (CVE-2017-11882). This vulnerability allows for arbitrary code execution when the document is opened. The embedded URL was confirmed benign and no scripts were extracted, but the exploit itself is sufficient for a high-confidence assessment.

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_2018_0802-6624871-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2018_0802-6624871-1
  • \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 https://raw.githubusercontent.com/accidentalrebel/accidentalrebel.com/gh-pages/theme/images/test.png

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000000fe.bin
d13ac8b39a62631ba0d9258d9d92a4925ee899011558440204ec89e04336c3fd		 rtf-objdata-decoded RTF \objdata at offset 0xFE 3627 bytes

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