Malicious RTF — malware analysis report

Static analysis result for SHA-256 607721c992595783…

MALICIOUS

RTF

2.23 MB
MD5: 3194bae8abb03d5fde5ce9f41fd49ca2 SHA-1: 1f6c7ef75f80207390047350b17152f77e95bafe SHA-256: 607721c992595783d59af1ba708a91b3c1dfdc38f15627b34fd50a49736a1692
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE objects and specifically triggers the CVE-2017-11882 vulnerability via the Equation Editor. This exploit is designed to execute arbitrary code, likely to download and run a second-stage payload. The presence of the Equation Editor ProgID 'Equation.3' is a strong indicator of this exploit.

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_off0000119b.bin
b115e176de3fa43d1151f3cf1be05e3bb2d7e4c49e30e4a1caaac6e302c5c372		 rtf-objdata-decoded RTF \objdata at offset 0x119B 39984 bytes
objdata_01_off00025a63.bin
6cfd2ac961c83935277ba53f8b28c8fb7359f5423d0b5bc871f5ff1eaf461fee		 rtf-objdata-decoded RTF \objdata at offset 0x25A63 485412 bytes

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