Malicious RTF — malware analysis report

Static analysis result for SHA-256 d2c1f081323d07be…

MALICIOUS

RTF

101.8 KB First seen: 2024-09-23
MD5: de32383dd4b004118b537fc2ae87e2b8 SHA-1: b2cfcf55e482401fa487c913987c176277d3cf25 SHA-256: d2c1f081323d07be21db725943cc4e3d6a6c0b3a14ee1b4a49e72543a1410ad4
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an RTF document that leverages the Equation Editor vulnerability (CVE-2017-11882) via OLE object activation. The critical heuristic 'RTF_EQUATION_EDITOR' and the high heuristic 'RTF_OBJUPDATE' strongly indicate exploitation for arbitrary code execution. This is likely a delivery mechanism for a secondary payload, though no specific download URLs or scripts were extracted.

Heuristics 3

  • Split hex Equation Editor ProgID + OLE object critical 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_off0000137d.bin
2b19063d97addd91f028e643bf856f7c087bfacda946a3065525f3de77e1afbb		 rtf-objdata-decoded RTF \objdata at offset 0x137D 2073 bytes

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