Malicious RTF — malware analysis report

Static analysis result for SHA-256 ab5de03c55db9c33…

MALICIOUS

RTF

321.4 KB Created: 2021-02-12 04:30:00
MD5: 2f538b38c815c4db5c494c30ccdbd39d SHA-1: a901445ae62f00ad372abeb2c154d982a79eba22 SHA-256: ab5de03c55db9c337a10e560f7ee4c1860c1048f1fc5822883d741599a884f32
102 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object that exploits the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution when the document is opened. The document body appears to be a list of schools, likely a lure to entice the user to open the malicious RTF file. No scripts were extracted, and the only URL found was benign.

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_off0000011e.bin
79760f716059f21a51615a8e65411bb03fdda800ff8a35cad6811ad5ea1e9c2b		 rtf-objdata-decoded RTF \objdata at offset 0x11E 3629 bytes

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