Malicious RTF — malware analysis report

Static analysis result for SHA-256 e55cc49f57d80ca6…

MALICIOUS

RTF

436.2 KB Created: 2019-03-20 23:35:00 First seen: 2019-10-30
MD5: e41d37b409e440de6c0123581d908e1e SHA-1: f08f4d898bc7e5b25d32807b9d2c5659989e4f7e SHA-256: e55cc49f57d80ca6d63776468f4a6a00e1c16faf389c9122957316824481be2f
142 Risk Score

Malware Insights

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

The RTF file contains multiple embedded OLE objects and triggers an OLE activation via \objupdate, which is a strong indicator of exploitation. The critical heuristic firing for CVE-2017-8759 confirms the exploitation of this specific vulnerability to achieve code execution. The embedded benign URL is not considered a malicious IOC.

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 7 \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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002cd4.bin rtf-objdata-decoded RTF \objdata at offset 0x2CD4 17467 bytes
SHA-256: b04146b5a7def4100f62a09244db6bc0349807e362b73eea29380fc5a80a04e1
objdata_02_off0001f0b2.bin rtf-objdata-decoded RTF \objdata at offset 0x1F0B2 17467 bytes
SHA-256: acab47706cfc35a3b987c29e19b3f0737dd378a90a88f83d08797e4b15a9a7f3
objdata_05_off0004967f.bin rtf-objdata-decoded RTF \objdata at offset 0x4967F 17467 bytes
SHA-256: 6a0e667f1548f0230642a34cb4cdf1dea4353ff791193856f075b60d0acef879

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