Malicious RTF — malware analysis report

Static analysis result for SHA-256 9104b13e9cb339bd…

MALICIOUS

RTF

16.6 KB Created: 2017-09-16 21:16:00 First seen: 2017-10-10
MD5: bc4e708cfb3bf9a51c880d4e802a4253 SHA-1: 3993fcc1b5fcdba4db61cea22067ec465459e59a SHA-256: 9104b13e9cb339bd7cc9e646a3964c67be8ddf66523ebc793f19791a7657408f
222 Risk Score

Malware Insights

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

The RTF file contains OLE object data and triggers heuristics for CVE-2017-8759 (SOAP Moniker RCE) and automatic OLE object updates. This indicates the file is designed to exploit a vulnerability to download and execute a secondary payload, likely delivered via spearphishing.

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_off00002b1e.bin rtf-objdata-decoded RTF \objdata at offset 0x2B1E 2600 bytes
SHA-256: 2c7327b51ab3129c139c69a6fe0335d5d73d139a7993a3e77f12fc9e8605a251

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