Malicious RTF — malware analysis report

Static analysis result for SHA-256 127c93d5b5f2f146…

MALICIOUS

RTF

771.7 KB Created: 2019-09-17 13:59:00 First seen: 2020-09-04
MD5: 771161fe79185a4a7e91ca6fec268a02 SHA-1: a1d7e13a2fb4a3a087a6e28accd961bd604a93bc SHA-256: 127c93d5b5f2f146e3e893ac3b3129a8c358227636175c424a3802828ed95a1d
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 triggered via \objupdate, exploiting CVE-2017-8759. This indicates the file is designed to execute arbitrary code upon opening. The embedded URL, while benign, is associated with the OLE object, suggesting a potential download or execution chain.

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_off000b3e1d.bin rtf-objdata-decoded RTF \objdata at offset 0xB3E1D 1414 bytes
SHA-256: 2b01776e815aadf861750ac69e398a5ebbd16d93ac8a6f291e033386a33f573b

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