Malicious RTF — malware analysis report

Static analysis result for SHA-256 3e64073849aea2d6…

MALICIOUS

RTF

5.6 KB First seen: 2017-08-08
MD5: 65b3e2f1fbb3c18e9bddbf9b8a8e88af SHA-1: 8b0ad779670097f313ca7da89674aa22fe8c11c1 SHA-256: 3e64073849aea2d6cc2f336463341fe8401f2d0013095abb3ba3a337e68fe899
222 Risk Score

Malware Insights

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

This RTF document exploits CVE-2017-0199 via an OLE object to automatically download and execute a payload from the URL http://172.16.1.57:8080/default.hta. The embedded OLE object and the weaponized URL are critical indicators of this exploit. The file is likely delivered as a spearphishing attachment.

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://172.16.1.57:8080/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: 2b7925022a29fff3d0d7f373a7a45b8e999d9a1dcc22019df671cb9b056fce6f

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