Malicious RTF — malware analysis report

Static analysis result for SHA-256 4e8257418b0480da…

MALICIOUS

RTF

52.0 KB Created: 2017-06-13 16:09:00 First seen: 2017-08-08
MD5: 2f19acd7f3feff14f4cf8865c73386e5 SHA-1: fde9f6e4d5821464825e002664040b9a7acc96af SHA-256: 4e8257418b0480daeb90f564bd441fe97bc283c1f4a532959935458e2f51dedc
282 Risk Score

Malware Insights

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

The RTF document exploits CVE-2017-0199 via OLE object activation to download a payload from the embedded URL http://radioideal.com.ve/rtn/bbs_view.php?mid=10201706m. This indicates a malicious document likely delivered as a spearphishing attachment, designed to execute arbitrary code from a remote source.

Heuristics 7

  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • 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://radioideal.com.ve/rtn/bbs_view.php?mid=10201706m In RTF body
    • http://radioideal.com.ve/rtn/bbs_view.php?mid=12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890In 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_off0000297d.bin rtf-objdata-decoded RTF \objdata at offset 0x297D 3625 bytes
SHA-256: 4245fd6b166b1dee9729d3c5b9cf62de41ffcd33db20b9b5f8721185057cc8ba

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