Malicious RTF — malware analysis report

Static analysis result for SHA-256 3c2670b364a39ff3…

MALICIOUS

RTF

7.2 KB First seen: 2019-04-18
MD5: 0c881988c82416d3441b3aeb1033f667 SHA-1: 7cd8eb9ed126d67de45e25b2f88a64bfa362f038 SHA-256: 3c2670b364a39ff33c3e83a6690502179586ba0faed5f8d2135df8a675fc6b55
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains embedded OLE object data and specifically triggers heuristics for Microsoft Equation Editor exploitation. ClamAV detection confirms this as Doc.Exploit.CVE_2017_11882-6934206-0, indicating a known vulnerability exploitation. The file's purpose is to leverage this exploit for client-side code execution.

Heuristics 4

  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.CVE_2017_11882-6934206-0
  • \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_off0000003b.bin rtf-objdata-decoded RTF \objdata at offset 0x3B 3642 bytes
SHA-256: 664c43ee76567f131880405ba7a204c80e198a75bbafbafe0f79b09146fae675

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