Malicious RTF — malware analysis report

Static analysis result for SHA-256 a839f9401b6ba778…

MALICIOUS

RTF

181.1 KB Created: 2019-09-08 16:28:00 First seen: 2020-02-04
MD5: 4bb8de0200afc6aa08823ccbac7c3a35 SHA-1: b6152ba71b616ba102db5e44b4803ea9cfd50d71 SHA-256: a839f9401b6ba778820d3042c6f31e134315df4574fe32e14ac5e26ffaa22818
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 when the object is activated. The embedded URL, while benign, is associated with the OLE object's structure.

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_off0001d287.bin rtf-objdata-decoded RTF \objdata at offset 0x1D287 25542 bytes
SHA-256: 1c4e94b37cb07b5507851b6cbb2e2c4019c7ced0d3f6cca548f648ceb0a38db3

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