Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 f6e3d1e06bd21bb6…

MALICIOUS

RTF / .DOC

2.02 MB
MD5: 316090355c0387c90455d902c703c817 SHA-1: f7238706c2bed1befce66c18bcf17936b1849c75 SHA-256: f6e3d1e06bd21bb6f68c5c4ecb6996d54a92f96ccb404adb7a9449223a248e0a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model

The RTF file contains an OLE object with a ProgID associated with Equation Editor, triggering heuristics for CVE-2017-11882. The presence of excessive hex-encoded data within an objdata section and the objupdate directive further indicate the embedding of a malicious payload designed for exploitation. No document body text or scripts were provided, limiting further analysis of the payload's specific actions.

Heuristics 5

  • 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.
  • \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 ~2118KB 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_off0000003d.bin
2b9f721577700499be84c512fe7500e7093968e1a1b9dd7b4aa2cbb098804b84		 rtf-objdata-decoded RTF \objdata at offset 0x3D 1059011 bytes

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