Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 e109dd7ac9c640c4…

MALICIOUS

RTF / .DOC

36.4 KB
MD5: 26c7f1513c2e7b08b423a15e6e89b408 SHA-1: fc88cd7a9240b1fc78c5adc5a65ebf0f1c3df4e9 SHA-256: e109dd7ac9c640c434041f1d18c2f21e57da5bbf2314801862236ad65254844d
180 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution T1559 Component Object Model Hijacking T1059.001 PowerShell T1027 Obfuscated Files or Information

The RTF file contains embedded OLE objects and specifically triggers the CVE-2017-11882 vulnerability through the Equation Editor component. This indicates an attempt to execute arbitrary code by exploiting a known Microsoft Office vulnerability. The presence of RTF_OBJDATA, RTF_OBJEMB, RTF_EQUATION_EDITOR, and RTF_OBJUPDATE heuristics strongly supports this attack pattern. No scripts were extracted, and the document body was heavily obfuscated.

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.
  • \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
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001f4b.bin
4fd1a25dd1c8944fb3ddf93b6585b0e01cfe328101295af50dfa87e928a1aed4		 rtf-objdata-decoded RTF \objdata at offset 0x1F4B 2199 bytes

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