Malicious RTF — malware analysis report

Static analysis result for SHA-256 7c624852a1a74959…

MALICIOUS

RTF

694.4 KB Created: 2019-09-17 13:59:00 First seen: 2020-09-04
MD5: b12048f2276ca5c7947cda1b2cda844e SHA-1: b21254fa0430d3c392c76a8ac06e9d21655ab2cc SHA-256: 7c624852a1a749595a3c3941f17b848c8f1b9b07082ff97b41d1681c740b542e
142 Risk Score

Malware Insights

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

The RTF document contains an embedded OLE object that is configured to update automatically, triggering an exploit for CVE-2017-8759. This vulnerability allows for arbitrary code execution, indicating the document's primary purpose is to compromise the user's system. The presence of the OLE object and the specific exploit targeted suggest a downloader or dropper functionality.

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_off0009a24c.bin rtf-objdata-decoded RTF \objdata at offset 0x9A24C 1414 bytes
SHA-256: 2b01776e815aadf861750ac69e398a5ebbd16d93ac8a6f291e033386a33f573b

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