Malicious RTF — malware analysis report

Static analysis result for SHA-256 c0934df76f2d2508…

MALICIOUS

RTF

8.2 KB First seen: 2018-10-13
MD5: 684cd3ba6f5b568bf39db67b04a5ac0d SHA-1: 727b7bfb9836b886f13e23ffc844c01a10fd99bd SHA-256: c0934df76f2d25081bf92d48f14f74417db952617dc1d09a4f88ceb2a2ef325b
280 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 triggers critical heuristics for Equation Editor and CVE-2017-11882. This indicates the file is designed to exploit this specific vulnerability for client-side code execution. The ClamAV detection further confirms its malicious nature. No document body or script content was available for further analysis.

Heuristics 6

  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882
    Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
  • ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.CVE_2017_11882-6934206-0
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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_off0000003f.bin rtf-objdata-decoded RTF \objdata at offset 0x3F 4145 bytes
SHA-256: 5a766e522677f7a0564187c9a1340bf15941033ee4a5bcaaa51cc72bc0458df1

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