Malicious RTF — malware analysis report

Static analysis result for SHA-256 33dff69a482c1158…

MALICIOUS

RTF

5.6 KB First seen: 2017-08-08
MD5: ac02151d29e4015ca3c986844c472231 SHA-1: 8c60ce01e8ba1d3cb7e026dfd1907990608bd46e SHA-256: 33dff69a482c1158146eea1688b1c6ba44f900473a40d834df0456557e7ed4cf
222 Risk Score

Malware Insights

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

The RTF file contains embedded OLE object data and is configured to automatically update and activate an OLE object. This behavior is indicative of an exploit for CVE-2017-0199, which is designed to download and execute a remote file. The targeted URL, http://c1164hn.hopto.org/logo.doc, is the likely source of the secondary payload.

Heuristics 6

  • 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.microsoft.com/office/word/2003/wordml In RTF body
    • http://c1164hn.hopto.org/logo.docIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000001a2.bin rtf-objdata-decoded RTF \objdata at offset 0x1A2 2601 bytes
SHA-256: 603a321661a38bdbf8dee3c0ba06008da521781161ddd7b98f45a27b3b59e665

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