Malicious RTF — malware analysis report

Static analysis result for SHA-256 80ce3f5d4c1d4127…

MALICIOUS

RTF

1.30 MB Created: 2019-09-17 13:59:00 First seen: 2020-06-01
MD5: 090467cf614db1a80c086b71a4843d28 SHA-1: cb328f8a4f05e9e041b2513bdc922f8aa6e8c902 SHA-256: 80ce3f5d4c1d4127369b60303612375154801ed9d8ab4225bdfddf0738013222
142 Risk Score

Malware Insights

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

The RTF file contains embedded OLE objects and triggers an ".objupdate" command, indicating an attempt to exploit CVE-2017-8759 for client execution. The presence of an embedded URL, though benign, suggests a potential download mechanism. The lack of document body text or scripts prevents a more specific assessment of the payload.

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_off00146419.bin rtf-objdata-decoded RTF \objdata at offset 0x146419 1413 bytes
SHA-256: 6af5a200d6197cc03e54fc50c55f7a0cf541699583bc5fa2db94fc323dc72391

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