Malicious RTF — malware analysis report

Static analysis result for SHA-256 5c7b319d66d11f6a…

MALICIOUS

RTF

73.1 KB Created: 2017-08-04 First seen: 2017-08-27
MD5: b35b5f27d7f4a1b55d1c9154d2ecc5e2 SHA-1: 978410b3abc2bc49610d541b04f6cfaa684598d9 SHA-256: 5c7b319d66d11f6a579bcf24a099e1788f6981a9aad8ca5cb1440f72a4366ea2
282 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains critical heuristics indicating exploitation of CVE-2017-0199, which is known to leverage OLE object activation to download and execute remote content. The embedded URL http://203.248.116.182/images/opt.hta is highly suspicious and likely serves as the second-stage payload. The document body is heavily obfuscated and does not provide clear user-facing content, further suggesting malicious intent.

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://203.248.116.182/images/opt.hta In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body
    • https://www.ana.co.jp/asw/index.jsp?type=iIn RTF body
    • https://www.ana.co.jp/domtour/In RTF body
    • https://www.ana.co.jp/asw/AMCTopServlet?type=aIn RTF body
    • https://www.ana.co.jp/book-plan/reservation/In RTF body
    • http://www.ana.co.jp/fs/dom/jp/In RTF body
    • https://www.ana.co.jp/book-plan/airinfo/timetable/domestic/In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00004277.bin rtf-objdata-decoded RTF \objdata at offset 0x4277 3884 bytes
SHA-256: 9679e5c37531879a414371d26c086d9f678ab274546fa8a5f3b091ed025269c6

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