Malicious RTF — malware analysis report

Static analysis result for SHA-256 94eeffad32608ae4…

MALICIOUS

RTF

55.5 KB First seen: 2019-09-30
MD5: eb09164c4d16efaa0fd04634a99af89f SHA-1: 95b06637126442d6a15c6eb78f2ec7f2a7ecbf1d SHA-256: 94eeffad32608ae42b8ed7679eb0f2a1fd55bc042c117534045dcabf4f0d66e8
120 Risk Score

Malware Insights

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

The RTF file contains critical heuristics indicating the use of the Equation Editor vulnerability (RTF_EQUATION_EDITOR) and OLE object activation (RTF_OBJDATA, RTF_OBJUPDATE). This strongly suggests exploitation for client execution. The file is likely delivered as a spearphishing attachment, aiming to download and execute a secondary payload.

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_off000004f9.bin rtf-objdata-decoded RTF \objdata at offset 0x4F9 1717 bytes
SHA-256: 8844dc8215f9b9319a9840c2791147227d10c1bc74675f7d48ca5a2338b92562

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