Malicious RTF — malware analysis report

Static analysis result for SHA-256 6fef8f3dbd4e8432…

MALICIOUS

RTF

191.2 KB Created: 2019-09-17 13:59:00 First seen: 2019-11-20
MD5: 6c78648fa2b2a3e0e8d9a4df43a04476 SHA-1: 74c31dd34dfeda721120cda0b714b9df6b77095c SHA-256: 6fef8f3dbd4e8432f103f1f3784a078ccdc04d151c864d8f831acb7f6db42351
142 Risk Score

Malware Insights

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

The RTF document contains embedded OLE objects that are triggered via \objupdate, leading to the exploitation of CVE-2017-8759. This vulnerability allows for the activation of MSXML SAX OLE objects, which can lead to arbitrary code execution. The document body is heavily obfuscated and does not provide clear textual lures.

Heuristics 5

  • 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.
  • \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 OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0001f3bd.bin rtf-objdata-decoded RTF \objdata at offset 0x1F3BD 25590 bytes
SHA-256: 48c2b3bb7fc19d55ce727063305d4c6d9f920808dfbd81b87a53405fc071ef54

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