Malicious RTF — malware analysis report

Static analysis result for SHA-256 738e064bbed3e330…

MALICIOUS

RTF

5.6 KB First seen: 2017-08-27
MD5: 28a042dde64f48aa624876ecf86aa824 SHA-1: f5090f0a5420410da4bec621d89b9a6ba86afd93 SHA-256: 738e064bbed3e330970c287adffc73eb89d3458527231d08eca61896a40df811
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 that is automatically linked and updated, exploiting CVE-2017-0199. This exploit is designed to download and execute a secondary payload, identified as 'default.hta', from the IP address 10.221.0.3. The presence of the weaponized URL and the ClamAV detection strongly indicate a malicious intent to execute arbitrary code.

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://10.221.0.3:8080/default.hta In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn 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: 15c9bc87cfe1e61a77ae6fa16457e2d6283494e853b3c57cb4fa0fefb847a457

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