Malicious RTF — malware analysis report

Static analysis result for SHA-256 16c787242490fb91…

MALICIOUS

RTF

5.6 KB First seen: 2017-11-29
MD5: b4da35c11e7b4dd39fbfb9d8584b9f23 SHA-1: 7c02bb92ee54b164be24de1b094f84ca06301b36 SHA-256: 16c787242490fb9109d753db7ef34869c4a146c7e30c760287a7fd1d3e850a00
222 Risk Score

Malware Insights

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

The RTF file contains an OLE object that leverages CVE-2017-0199 to automatically link to and download a remote document. The embedded URL http://185.36.190.18/PO/p.doc is highly suspicious and likely serves as the source for a secondary stage payload. This exploit is commonly used in targeted phishing campaigns.

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://185.36.190.18/PO/p.doc 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_off000001a2.bin rtf-objdata-decoded RTF \objdata at offset 0x1A2 2601 bytes
SHA-256: 82e699d2d0d51edd98acd3c35e1752161a8295d21139de3aa7f873863ce7b167

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