Malicious RTF — malware analysis report

Static analysis result for SHA-256 093aed8321e0c995…

MALICIOUS

RTF

14.0 KB First seen: 2023-03-03
MD5: e65c722b00600584d7d4b3d076677fe3 SHA-1: 852f00f649d43f8df47d730a57ec07db9ce29a4d SHA-256: 093aed8321e0c99537fde1bd8c9cd7e2bfef3fdcde9ddd5122f4d63665a9e602
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1204 User Execution

The RTF document contains an OLE object specifically crafted to exploit CVE-2017-11882, as indicated by multiple high and critical heuristic firings related to Equation Editor and OLE object activation. This exploit is designed to execute arbitrary code, likely to download and run a secondary malicious payload. The presence of the `EQuAtiON.3` ProgID is a strong indicator of this specific vulnerability being targeted.

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.
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001d75.bin
161ec6db842b63b843fb18c5ced8c480f16244c22015d2e323e5f3215358829f		 rtf-objdata-decoded RTF \objdata at offset 0x1D75 1419 bytes

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