Malicious RTF — malware analysis report

Static analysis result for SHA-256 7f7c58c621354d77…

MALICIOUS

RTF

113.0 KB Created: 2021-07-16 07:42:00
MD5: a4293c676aff9ddf7743815470eaa7ee SHA-1: ad8acc81b47ae052693de1d13f12f13b880521b2 SHA-256: 7f7c58c621354d770479cdccf593f29bd58fd411191fa83e41b7246194337b90
102 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains an embedded OLE object that triggers the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This vulnerability allows for the execution of arbitrary code, likely to download and run a secondary payload. The embedded URL was confirmed as benign and did not contribute to the maliciousness.

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_off000032ad.bin
852ec29a0ed856d38af7cef676717c2d52bfa8ac17f2d9ff029ff75cf20a685e		 rtf-objdata-decoded RTF \objdata at offset 0x32AD 3629 bytes

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