Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 00175c704e4d534a…

MALICIOUS

RTF / .DOC

1.54 MB
MD5: 51a19560ad005f1dfaf49d959c2dbe7a SHA-1: 660adab2960c1e726e610223e3032595f49f7e74 SHA-256: 00175c704e4d534a072f8d777bbb5413dfa32d51fd6b922e88e980c02357b0f1
260 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File Execution: User Execution: Malicious File T1559.001 Component Object Model Hijacking: Component Object Model

The RTF document contains an OLE object specifically identified as related to CVE-2017-11882. The presence of `RTF_EQUATION_EDITOR` and `CVE_2017_11882_RELATED` heuristics strongly indicates exploitation of this vulnerability. The large amount of hex-encoded data within the OLE object suggests it is a packed or obfuscated payload, likely a second-stage downloader or malware.

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 ~1613KB 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_off00000041.bin
205f743d74d202d57b732afb81db84e717ba43d85c3c0aca92c7b694d7da872e		 rtf-objdata-decoded RTF \objdata at offset 0x41 806870 bytes

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