Rtf.Downloader.CVE_2017-6336326-3 — RTF malware analysis

Static analysis result for SHA-256 5130e07eda1bde32…

MALICIOUS

RTF

5.6 KB First seen: 2020-09-15
MD5: f8f942eb4cd5845bc73a1600bd72b9e3 SHA-1: fe2963172836cb9b2a45855ffb7b6e3100317a6a SHA-256: 5130e07eda1bde32fcf52cbeeccfdfb376a452be17540ec66f05da7d9b808fcf
222 Risk Score

Malware Insights

Rtf.Downloader.CVE_2017-6336326-3 · confidence 95%

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

The RTF file contains OLE object data and triggers heuristics related to CVE-2017-8759, indicating exploitation for remote code execution. ClamAV also identifies it as Rtf.Downloader.CVE_2017-6336326-3, suggesting its primary function is to download and execute a secondary payload. The presence of ".objupdate" and "objautlink" further supports the automated activation of embedded objects for exploitation.

Heuristics 6

  • SOAP Moniker — CVE-2017-8759 (SOAP WSDL RCE) critical CVE related CVE_2017_8759
    RTF \objdata decodes to OLE data containing the SOAP Moniker — CVE-2017-8759 (SOAP WSDL RCE) CLSID — the vulnerable control/moniker is embedded directly in the document's object stream, the delivery shape of this exploit. RTF objects auto-render when Word opens the file.
  • ClamAV: Rtf.Downloader.CVE_2017-6336326-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Downloader.CVE_2017-6336326-3
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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 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://schemas.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000001ab.bin rtf-objdata-decoded RTF \objdata at offset 0x1AB 2600 bytes
SHA-256: 149b4d7c2a793db9e05136b5ecf9c66bacae022a58d70fea519a8a29c2e893c4

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