Malicious RTF — malware analysis report

Static analysis result for SHA-256 6794a1c0dd7e676b…

MALICIOUS

RTF

1.45 MB
MD5: 2068ca09534f3fe77f87d24d5e1ac837 SHA-1: 8587296fe27f774a3fda93be19445e950a93d716 SHA-256: 6794a1c0dd7e676bca0b4e5831ef523234b10b39465c5ae9497bbb02eac9393c
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains embedded OLE objects and specifically triggers the CVE-2017-11882 vulnerability related to Equation Editor. This exploit is known to be used to execute arbitrary code, likely to download and run a secondary payload. The presence of the 'Equation.3' class further confirms the exploitation vector.

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_off00001269.bin
50042e222b76505764cb83c9c488cc2b6c09620e11b8bfe1f116c291a3a79844		 rtf-objdata-decoded RTF \objdata at offset 0x1269 13655 bytes
objdata_01_off00008e3f.bin
c222b3114327f5635318862435c3f055510c1a0ab9a8303a1cf7a519eae7e941		 rtf-objdata-decoded RTF \objdata at offset 0x8E3F 275202 bytes

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