Malicious RTF — malware analysis report

Static analysis result for SHA-256 3d65e98f9809acf7…

MALICIOUS

RTF

65.8 KB Created: 2017-07-26 15:03:00 First seen: 2017-08-08
MD5: 71055aab47af8460368786781594f118 SHA-1: 8cd968f16da3530b22ee358d1801bd8dcadb7580 SHA-256: 3d65e98f9809acf7dec2a914ffa21bcedf08a3e04eb84e26ca7e98c4a047e1e4
282 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains OLE object data and is weaponized to exploit CVE-2017-0199. This exploit is designed to automatically link and update an OLE object, triggering the download and execution of a second-stage payload from the embedded URL http://178.178.170.211/build.hta. The embedded HTA suggests a JavaScript payload, likely for further execution.

Heuristics 7

  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • CVE-2017-0199 (OLE2Link / weaponized URL) critical CVE exact CVE_2017_0199_WEAPONIZED_URL
    RTF contains a URL Moniker OLE link to a script/HTA/template-style remote loader, matching the tighter static CVE-2017-0199 shape.
  • ClamAV: Rtf.Exploit.CVE_2017_0199-6335035-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_0199-6335035-0
  • 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://178.17.170.211/build.hta In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002ae3.bin rtf-objdata-decoded RTF \objdata at offset 0x2AE3 2601 bytes
SHA-256: 8f01254925bdfdbcbd412baf2c5b9bd610ef5872643ed24d842dff8dcdd32a8e

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