Malicious RTF — malware analysis report

Static analysis result for SHA-256 c99a1d626c5b7eb9…

MALICIOUS

RTF

3.7 KB First seen: 2019-04-18
MD5: 87709cf69727296bfeebcdb6d8d05a42 SHA-1: c70dc028fafe9b6e480b027b1880f57d75cd6b09 SHA-256: c99a1d626c5b7eb9c4403ebd5b1b4730df324d43cb763c16f1a45848e7713594
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains OLE object data and specifically triggers heuristics related to the Equation Editor vulnerability (CVE-2017-11882). This indicates the file is designed to exploit this vulnerability for client-side execution. The embedded OLE object data likely contains shellcode or a script that, upon activation via \objupdate, downloads and executes a secondary payload. No specific family could be identified.

Heuristics 3

  • Split hex Equation Editor ProgID + OLE object critical CVE likely RTF_EQUATION_EDITOR
    RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
  • \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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000003c.bin rtf-objdata-decoded RTF \objdata at offset 0x3C 1862 bytes
SHA-256: 411da0a475113bdf5abd7193b83ad98454d6b86f3577bdf8fbc696c57490202d

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