Malicious RTF — malware analysis report

Static analysis result for SHA-256 63caa833d40cecf9…

MALICIOUS

RTF

53.7 KB Created: 2018-12-12 11:05:00 First seen: 2019-08-04
MD5: a7a9bc76420cc24cadd158d9eecb7115 SHA-1: 5a9df97b8053e936fe19f0e1ad32d03cef531613 SHA-256: 63caa833d40cecf9152b9e1a0df4e00964e94052f3c8083cb2eb669f9fad2687
282 Risk Score

Malware Insights

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

The RTF file contains critical heuristics indicating exploitation of CVE-2017-0199, which is known to download and execute remote content. The embedded URL http://5.196.163.145/0x22df0e8.rtf is directly associated with this exploit, suggesting the file's purpose is to act as a dropper for a secondary payload. The presence of OLE object data and automatic linking further supports the exploitation vector.

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 / remote URL Moniker) critical CVE likely CVE_2017_0199
    RTF contains a URL Moniker OLE link whose decoded target is remote. Office can fetch and process the response through the CVE-2017-0199 OLE2Link attack path, but the server-side content type is not proven statically.
  • 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://schemas.m In RTF body
    • http://5.196.163.145/0x22df0e8.rtfIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002ad4.bin rtf-objdata-decoded RTF \objdata at offset 0x2AD4 2601 bytes
SHA-256: f2a4eaed6d3e96db78ff7e77d3af260be72724374d85d0d460f68b1b1d85ea90

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