Malicious RTF — malware analysis report

Static analysis result for SHA-256 7f4d50c530c9c40a…

MALICIOUS

RTF

271.5 KB Created: 2021-02-12 04:30:00
MD5: db66ede8f8b565eb2296ae3235863918 SHA-1: 18d06b6dbfb1f44ecb2e20fcf7d17fe1f67f4a85 SHA-256: 7f4d50c530c9c40a1bf83c3049c6637fda850f7f66c4b65cb2d3cbf3d370e5bb
102 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains an embedded OLE object that exploits the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This exploit is known to be used for arbitrary code execution, typically to download and run a second-stage malicious payload. No specific family could be identified, but the exploit vector is clear.

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_off00001bc4.bin
7555a705709862179f1002fae5215f8d25a43bf34efd7bf4b9f852f56a908b7a		 rtf-objdata-decoded RTF \objdata at offset 0x1BC4 3615 bytes

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