Malicious RTF — malware analysis report

Static analysis result for SHA-256 538d9e95c02b2597…

MALICIOUS

RTF

356.4 KB Created: 2019-09-17 13:59:00 First seen: 2020-07-24
MD5: 0c191ec4b68efda3d1eab2b406ddf095 SHA-1: 167db0f69865dd84768c9ecc4ab35a0dfce53a58 SHA-256: 538d9e95c02b259735337453d5e06269c2247ab65720730ba5c5d41290c2008e
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 uses \objupdate to force activation, indicating an attempt to exploit vulnerabilities. Specifically, the CVE-2017-8759 heuristic firing points to MSXML SAX OLE activation, a known method for executing arbitrary code. The embedded URL, while benign, is present within the RTF body, suggesting it might be part of a larger lure or exploit 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_off00053ad9.bin rtf-objdata-decoded RTF \objdata at offset 0x53AD9 1414 bytes
SHA-256: d16286d526682e1c01e82a3528eb77f7eec14e825f0d529f19104a82037e8556

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