Malicious RTF — malware analysis report

Static analysis result for SHA-256 b3ee594a68da0bbf…

MALICIOUS

RTF

5.6 KB Authoring application: Msftedit 5.41.21.2510 First seen: 2019-11-20
MD5: 5bc2524e99f3377c9ef13a993bf41205 SHA-1: ce847cce1e0cf51e0d5a30ab019910b0b1952a3b SHA-256: b3ee594a68da0bbfd245b3048b730020b409b1b04e96b7dec21d323e3a10120f
182 Risk Score

Malware Insights

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

The RTF file contains an OLE object that is automatically linked, exploiting CVE-2017-0199. This vulnerability is used to fetch and execute a secondary payload from the embedded URL http://asdf.com/m/u9/thrid/main3.html. The ClamAV detection further confirms the malicious nature of the file, specifically identifying it as an exploit targeting CVE-2017-0199.

Heuristics 5

  • 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.
  • 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://asdf.com/m/u9/thrid/main3.html In RTF body
    • http://asdf.com:80//m/u9/thrid/main3.htIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000000fa.bin rtf-objdata-decoded RTF \objdata at offset 0xFA 2724 bytes
SHA-256: a2fe85a21b303e15291bcf2e9cb415ab3d816d7707d08a9776220eab0d2a7706

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