Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 47cf15d3c8b73174…

MALICIOUS

RTF / .DOC

26.4 KB
MD5: f34beb444146f16c27418059cbf06dbc SHA-1: 85c1e3d41d9b6d68b4b30e58c2ad502a30aaf337 SHA-256: 47cf15d3c8b73174f8cb5c67c8978d371f5bcbeb1bfd73b3a3a30e8e1cba051e
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell

The RTF document contains an embedded OLE object specifically identified as related to CVE-2017-11882, which is a known vulnerability in Microsoft Equation Editor. The presence of RTF_OBJDATA, RTF_OBJEMB, RTF_EQUATION_EDITOR, and RTF_OBJUPDATE heuristics strongly indicates that this exploit is intended to be triggered upon opening the document, leading to arbitrary code execution. No document body or scripts were extracted, but the exploit itself is sufficient to classify the attack pattern.

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_off00001d7b.bin
5e48bfe19d7aec28718cc432d73035689cb946cb4c71e25d0bdadedc2587fe71		 rtf-objdata-decoded RTF \objdata at offset 0x1D7B 1758 bytes

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