Malicious RTF — malware analysis report

Static analysis result for SHA-256 6d3986da76008135…

MALICIOUS

RTF

5.6 KB First seen: 2017-09-14
MD5: 92d393e46dafb50a3d80ca7ba46b6f42 SHA-1: 22f3c1e7c7d7ab2de5ea5f1ea9b432d63b602761 SHA-256: 6d3986da76008135d2e270127a5f8600cf5b7b6fd5d95fd568585338450d9b35
222 Risk Score

Malware Insights

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

The RTF file contains an OLE object configured for automatic linking and updating, exploiting CVE-2017-0199. This mechanism is designed to fetch and execute a payload from the specified URL, http://sos.gotdns.ch:8080/default.hta, which is characteristic of a downloader or initial access exploit.

Heuristics 6

  • 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://schemas.microsoft.com/office/word/2003/wordml In RTF body
    • http://sos.gotdns.ch:8080/default.htaIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000001b4.bin rtf-objdata-decoded RTF \objdata at offset 0x1B4 2601 bytes
SHA-256: 2ca285674b6e462218977052084d46a9d77b950b7b014c201d27aeca75a372e8

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