Malicious RTF — malware analysis report

Static analysis result for SHA-256 e512541ba0bab403…

MALICIOUS

RTF

260.3 KB Created: 2021-02-12 04:30:00
MD5: 30fc62b31da129a058c86bbba84fade7 SHA-1: ba754d54ee52500da8d4cbd866c77b34873204e7 SHA-256: e512541ba0bab4036e8c21cbee071eee0fe9f7db2f9b7d0be9526f0cbdc59412
102 Risk Score

Malware Insights

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

The RTF document contains an embedded OLE object that exploits the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution, likely to download and run a secondary payload. The document body content appears benign, but the critical heuristic firing indicates a high likelihood of exploitation.

Heuristics 4

  • CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882
    Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.microsoft.com/office/word/2003/wordml

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000000fe.bin
6f2546660c8101ee0d9e665b909f246ad752d2bccf8a495e5f3cd8f35d9fe6fe		 rtf-objdata-decoded RTF \objdata at offset 0xFE 3628 bytes

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