Malicious RTF — malware analysis report

Static analysis result for SHA-256 c4955f8d603c6acc…

MALICIOUS

RTF

1.89 MB Created: 2019-09-17 13:59:00 First seen: 2020-09-15
MD5: 2d84eeb3ec6b6941c4bda5d6f004df93 SHA-1: 0ee4bd9ebe2c21f60741ad55b807c4018375ac18 SHA-256: c4955f8d603c6accc10f0047de011fca440c4aa01667a67023982bdc00eff612
142 Risk Score

Malware Insights

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

The RTF file contains embedded OLE object data and uses \objupdate to force OLE activation, specifically targeting CVE-2017-8759. This indicates an attempt to exploit a vulnerability for client execution, likely leading to the download of a secondary payload. The benign URL found is not considered a primary IOC for malicious activity.

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_off001d1523.bin rtf-objdata-decoded RTF \objdata at offset 0x1D1523 1414 bytes
SHA-256: cf18905e70c77a2bc9d6f4849204dee58e46ad1cbe24114d5903fc2bc3d78937

Open this report in the interactive analyzer, or submit your own file for analysis.