Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 75d3e497719b1241…

MALICIOUS

RTF / .DOC

24.9 KB
MD5: 57351dcda6944b90016c0a6acbbd26f4 SHA-1: 92034cbea0cc9492a10b58ec3321927543cdc4ca SHA-256: 75d3e497719b1241508e3d76408ee89f6a59405a06a3ebb68ffd9d90b63f7eb6
200 Risk Score

Malware Insights

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

The sample is an RTF document that contains OLE object data, specifically triggering heuristics related to CVE-2017-11882 and the Equation Editor. This indicates the file is designed to exploit this vulnerability for code execution. The presence of ".objupdate" and automatically linked OLE objects further supports the exploitation vector. No document body or script content was available for analysis, but the critical heuristic firings strongly suggest a malicious intent to execute code.

Heuristics 5

  • Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED
    RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
  • 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.
  • 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 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001f27.bin
fac44cc477b0c056e65a196f16062c53f8c9dea5cabde675d55e274a400f9573		 rtf-objdata-decoded RTF \objdata at offset 0x1F27 1698 bytes

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