Malicious RTF — malware analysis report

Static analysis result for SHA-256 3adfd3a94a6f199b…

MALICIOUS

RTF

47.3 KB Created: 2018-11-12 21:34:00 First seen: 2019-11-20
MD5: 281d4273c9c158afd5479e87133ffdf5 SHA-1: 6cc64660780a1a798c2228ac82b42190e9330426 SHA-256: 3adfd3a94a6f199be6c9e67245a85a9685e4b38d6c08b03125ca967ad835c8cf
182 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 fetch a remote resource. The heuristic firings and the embedded URL indicate that the file is designed to exploit this vulnerability to download and execute a secondary payload. The specific payload and its ultimate purpose are not discernible from the provided evidence, hence the family is marked as unknown.

Heuristics 5

  • 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.
  • 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://192.168.1.37/small.jpg In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002939.bin rtf-objdata-decoded RTF \objdata at offset 0x2939 3202 bytes
SHA-256: 1807bbdadc5aef17cef883e999d45e9b69aeb0d804b81b15d0181fe7f9949c0f

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