Malicious RTF — malware analysis report

Static analysis result for SHA-256 c18a3d5cb1232104…

MALICIOUS

RTF

319.3 KB Created: 2019-09-17 13:59:00 First seen: 2020-06-01
MD5: cbfad930a4a506787bd5a59644b31e6d SHA-1: a473118327cbab3b1ce9e1682644ce00dcef173a SHA-256: c18a3d5cb1232104953cf308df13f4bd987a489e4ffa0ed87e16a456e6fc0bd7
142 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object that is configured to update automatically, triggering an exploit for CVE-2017-8759. This exploit is known to facilitate the execution of arbitrary code, likely to download and run a secondary payload. The presence of the ".bin" file and the OLE object data further support this attack vector.

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_off0004b74b.bin rtf-objdata-decoded RTF \objdata at offset 0x4B74B 1413 bytes
SHA-256: de576ff65eef9907e4ea6f75e42da17347ba7bcaf21097a33c318b35321bf6fa

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