Malicious RTF — malware analysis report

Static analysis result for SHA-256 953ecf4715b1d9b5…

MALICIOUS

RTF

8.2 KB First seen: 2019-01-12
MD5: 94e6892f5fff67aab284726893ecff9d SHA-1: f53b2d9da9b36a3777d8c2ec929cee79e01982db SHA-256: 953ecf4715b1d9b5e98c17606acb71f4669543e062524ff98ce956f80787a8f0
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an RTF document containing an embedded OLE object that triggers an exploit. Heuristics and ClamAV detection specifically identify this as an exploit targeting CVE-2017-11882 within the Equation Editor component. This vulnerability allows for arbitrary code execution upon opening the document.

Heuristics 4

  • 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
  • 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 4142 bytes
SHA-256: c454a37e1daef553eeb2415dbceca49765417487fe4de8b0e5635f344e7503af

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