Malicious RTF — malware analysis report

Static analysis result for SHA-256 63404b41f27dafa6…

MALICIOUS

RTF

5.8 KB First seen: 2017-10-10
MD5: f7b873c8e79b46046ec3effc1fce1419 SHA-1: 28866abcfc13524c3046aad11537a56b40564c54 SHA-256: 63404b41f27dafa674ebd6f0f8383eb8f8baf2f410e8827aaec5b506521eab59
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 is automatically linked and updated, exploiting CVE-2017-0199. This vulnerability is used to download a payload from the provided URL, which is then likely executed on the victim's machine. The ClamAV detection further confirms the malicious nature of this exploit.

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
    • https://fs07n1.sendspace.com/dl/de316fdd372f79a60b6cda4d3c5f8ee5/59b8eIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000001ab.bin rtf-objdata-decoded RTF \objdata at offset 0x1AB 2688 bytes
SHA-256: caf3dbbd8864ae68510623a88089f2219d4620fce5f97fa7da552d420282ab84

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