Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 84931c079e1d3a63…

MALICIOUS

RTF / .DOC

1.89 MB
MD5: 94c2c54979e762b8ab8d022b16737cee SHA-1: 4b90e524a506cefa6b3d792b8acf952cd0a1399f SHA-256: 84931c079e1d3a6387bc558c7b7029c230c96505e9117c4e1351bb8df9323f17
260 Risk Score

Malware Insights

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

The RTF document contains an embedded OLE object specifically identified as related to CVE-2017-11882, exploiting the Equation Editor vulnerability. This exploit is designed to execute a secondary payload, likely a shellcode or executable, directly on the victim's machine. The presence of excessive hex data and OLE object activation further supports this exploitation vector.

Heuristics 6

  • Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED
    RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact 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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~1984KB of hex-encoded data inside \objdata sections — may hide a payload
  • 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_off00000040.bin
9a62ef4f868d9f6b7f96c17ecf9d3abe964de90e2e852de400289d06e459e2d6		 rtf-objdata-decoded RTF \objdata at offset 0x40 992440 bytes

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