Malicious RTF — malware analysis report

Static analysis result for SHA-256 a57477a8e4d8ac9c…

MALICIOUS

RTF

111.3 KB Created: 2021-07-16 07:42:00
MD5: b7829fe75ca8126e02c60c40a04a8012 SHA-1: b2f1ca2f7af7d9ceae1824e6a4cb471230b5e3b1 SHA-256: a57477a8e4d8ac9c1d7e810f9299c62011c18d919f24925ab3555a32a027a108
102 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object that triggers a critical vulnerability, CVE-2017-11882, related to the Microsoft Equation Editor. This exploit allows for arbitrary code execution on the victim's machine. No document body or scripts were extracted, but the critical heuristic strongly indicates 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_off00003108.bin
2d469a4f4e5207506575734b9d29a8658f4662cdc9e53daf4f4a0cfc838d7953		 rtf-objdata-decoded RTF \objdata at offset 0x3108 3629 bytes

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