Malicious RTF — malware analysis report

Static analysis result for SHA-256 5c863ba0ac2dabcf…

MALICIOUS

RTF

40.6 KB First seen: 2019-05-16
MD5: 113f0ac48a6f21b58562abc77dfdc4b0 SHA-1: d57a3897569cec1f350073ca372af4b3839124e6 SHA-256: 5c863ba0ac2dabcf00353c7cb9b79a522a0096c46fcebc8401d0440b2e031ee0
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains an OLE object with objdata, and a \objupdate field that forces OLE activation. ClamAV detection confirms this is a known exploit for CVE-2017-11882, which targets the Microsoft Office Equation Editor. This vulnerability allows for arbitrary code execution.

Heuristics 3

  • ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.CVE_2017_11882-6934206-0
  • \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 4141 bytes
SHA-256: c9d19d03e3adebf6146d5109121bee6202ccadb4af9006911b04d48a68c4c75b

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