Malicious RTF — malware analysis report

Static analysis result for SHA-256 978648749ff74d31…

MALICIOUS

RTF

1.70 MB Created: 2019-09-17 13:59:00 First seen: 2020-05-25
MD5: a691400482bfbca0f91ed8f7215d279b SHA-1: 786ded63f73e2b7f9b194735e92531425c767907 SHA-256: 978648749ff74d31c71039b53b70fd1edd33cfcca61e6f30c3ed9ee1e0bc8d12
142 Risk Score

Malware Insights

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

The RTF document contains embedded OLE objects and triggers an OLE activation via \objupdate, specifically exploiting CVE-2017-8759. This indicates the file is designed to execute arbitrary code by leveraging a known vulnerability in MSXML. The embedded URL, though benign, is associated with the OLE object 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_off00194c22.bin rtf-objdata-decoded RTF \objdata at offset 0x194C22 1413 bytes
SHA-256: bc96048b3410b2d729575e22e7359f4165844045f7014abdfecd772649eac7d0

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