Malicious RTF — malware analysis report

Static analysis result for SHA-256 eccf3afb4c13f4b4…

MALICIOUS

RTF

41.4 KB Created: 2017-11-27 01:38:00 First seen: 2017-11-29
MD5: 878dc8de116aa207bbf00263ea42a177 SHA-1: fc8b014685c08b310ff8fc58a3d13f0bbdf95a9e SHA-256: eccf3afb4c13f4b4c48e9b7f992b951fe7ba1de5c14f83086c6b3d624fce63c3
182 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 critical heuristics for CVE-2017-8759 (SOAP Moniker RCE) and ClamAV detection as a downloader. This indicates the file is designed to exploit this vulnerability to download and execute a malicious payload, likely delivered as a spearphishing attachment.

Heuristics 5

  • 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.
  • 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_off0000277b.bin rtf-objdata-decoded RTF \objdata at offset 0x277B 3640 bytes
SHA-256: 8bba3b1bd83d0df929f47149e3cdc6aaeb8bd415cadfbe644eb31286265837fd

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