Malicious RTF — malware analysis report

Static analysis result for SHA-256 f9bd9207ec7e74fa…

MALICIOUS

RTF

48.3 KB Created: 2018-05-26 10:13:00 First seen: 2019-05-16
MD5: 827204b9c9df0424adc169e1afd0b449 SHA-1: 9a3740e159524a63cdfcfd6b30033b9189235e5f SHA-256: f9bd9207ec7e74fadbb3ff8c10cfc3eaa9c69b1247cf5fb90872dee7efa9d9ec
282 Risk Score

Malware Insights

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

The RTF document contains embedded OLE objects and exploits CVE-2017-0199, a known vulnerability for remote code execution via OLE activation. The exploit targets the URL http://127.0.0.1/www.html to download a secondary payload. This indicates a likely initial access vector via spearphishing attachment, leading to client execution.

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://127.0.0.1/www.html 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_off00002cdd.bin rtf-objdata-decoded RTF \objdata at offset 0x2CDD 3202 bytes
SHA-256: 84ec11c544ada12ca2f793ee041bc52f83b480a119732be43df13999122325b9

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