Malicious RTF — malware analysis report

Static analysis result for SHA-256 5f220d49999e9785…

MALICIOUS

RTF

255.8 KB Created: 2019-08-06 01:42:00 First seen: 2020-05-25
MD5: bb309c160a85ec68bd43498ed2bf0471 SHA-1: 9db32cd79df6f5e60f596b4bc033ca9d9f2e324c SHA-256: 5f220d49999e9785299be38fcd963fe2db7957545cdb19e8863a9e9eb5d44afa
142 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains embedded OLE objects and triggers the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This exploit is known to allow arbitrary code execution, likely to download and run a second-stage payload from the suspicious URL http://s263633.smrtp.ru/thr/bi.msi.

Heuristics 5

  • 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.
  • \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 3 \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://s263633.smrtp.ru/thr/bi.msi In RTF body
    • http://schemas.microsoft.com/office/word/2003/wIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000079f2.bin rtf-objdata-decoded RTF \objdata at offset 0x79F2 15892 bytes
SHA-256: 0012ccde12bb47680130074d5a59f6e7b54f1f6a5079482ce05b3ed5b52aae81

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