Malicious RTF — malware analysis report

Static analysis result for SHA-256 ea032f287f84236d…

MALICIOUS

RTF

384.5 KB Created: 2017-11-19 09:10:00 First seen: 2018-01-08
MD5: 1ea28ffe971c7dd28f2c44112eeca875 SHA-1: 65569789e679e5972373c87d4ee450199e00cda4 SHA-256: ea032f287f84236dee3e9fcbcdfdfcab2ff28c43a5a584b47be2540ff7cab500
222 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains OLE objects that trigger remote content loading, specifically exploiting CVE-2017-0199 or CVE-2017-8759. The embedded URL http://hairfoxwan.com/tes/t.php?stats=send&thread=0 is used to download a secondary payload. ClamAV also detected this file as a downloader, reinforcing the malicious intent.

Heuristics 6

  • CVE-2017-0199 / CVE-2017-8759 (OLE2Link auto-activated remote loader) critical CVE related RTF_OLE2LINK_REMOTE_MONIKER_LOADER
    RTF embeds an OLE2Link object that is force-activated with \objupdate (no user interaction on open) and fetches a remote second stage — through an INCLUDETEXT/INCLUDEPICTURE field or the OLE object's own moniker. This is the OLE2Link auto-update attack path shared by CVE-2017-0199 (server returns an HTA/scriptlet) and CVE-2017-8759 (server returns a SOAP WSDL the .NET parser compiles). Office processes the fetched response through the same code path; the specific CVE depends on the now-unreachable server content type.
  • ClamAV: Rtf.Downloader.CVE_2017-6336326-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Downloader.CVE_2017-6336326-3
  • \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.
  • INCLUDETEXT/INCLUDEPICTURE remote URL high RTF_INCLUDE_REMOTE
    RTF document uses INCLUDETEXT or INCLUDEPICTURE with an http:// URL — Word can fetch the remote content on open depending on Office version and external-content settings, enabling remote template injection, NTLM capture via redirects, or payload delivery
  • OLE object data medium RTF_OBJDATA
    RTF contains 2 \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://hairfoxwan.com/tes/t.php?stats=send&thread=0 In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000c568.bin rtf-objdata-decoded RTF \objdata at offset 0xC568 2598 bytes
SHA-256: 8bd30da4d7d90e916f59640b83f7f823299e706ae122159159e41266bfd5782b
objdata_01_off0000dc96.bin rtf-objdata-decoded RTF \objdata at offset 0xDC96 2674 bytes
SHA-256: aae3800da8e45ecea5d096bf1a4d403d1ff3bd759b049bf6eccb9621ca6b99d1

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