Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 eccd3cc4b22869b3…

MALICIOUS

RTF / .DOC

1.60 MB
MD5: 6e4954dda9c273341b0b5ffff01639bd SHA-1: 675bd4a59cb4f9a4c445a14b1c084a7282aac9f4 SHA-256: eccd3cc4b22869b3059427ca08a773926e078e31996de9c1deeb71160d04cee4
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1027 Obfuscated Files or Information

The RTF document contains embedded OLE objects, specifically triggering the CVE-2017-11882 vulnerability related to Microsoft Equation Editor. This exploit is designed to achieve arbitrary code execution upon activation of the embedded object. No scripts were extracted, and no further IOCs were identified beyond the exploit itself.

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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000011e1.bin
dc4d11c0d2bd37676d9bb723990b1717edcd5735289e2f257e401d31f90ff786		 rtf-objdata-decoded RTF \objdata at offset 0x11E1 56001 bytes
objdata_01_off0003342b.bin
078f4826f1fd7ea74b366f8203fc5dc103f9012dddd7cede4b9d1d69bc7eed6c		 rtf-objdata-decoded RTF \objdata at offset 0x3342B 351910 bytes

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