Malicious RTF — malware analysis report

Static analysis result for SHA-256 25c06b52cdf35b65…

MALICIOUS

RTF

45.9 KB Created: 2017-09-25 First seen: 2017-10-10
MD5: 77dc68b871895f6c217118619cadbe2a SHA-1: 5e19b74314e8f8aec58a44b9012844c4232f4435 SHA-256: 25c06b52cdf35b659ce2de496927e52461816766b441bd8933b0df79549bb2d9
282 Risk Score

Malware Insights

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

The RTF file contains critical heuristics indicating exploitation of CVE-2017-0199 and CVE-2017-8759, which are known vulnerabilities for remote code execution. The embedded URL 'http://127.0.0.1/logo.png' is likely used to download and execute a secondary payload. The presence of OLE object data and automatic linking further supports the exploit mechanism.

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/logo.png In RTF body
    • http://schemas.microsoft.com/office/word/2003/woIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000027ba.bin rtf-objdata-decoded RTF \objdata at offset 0x27BA 2724 bytes
SHA-256: fbfe6f586bd404fde99bf821e8109ab6986dc8122cc60e3c5f3488d8cd975be2

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