Malicious RTF — malware analysis report

Static analysis result for SHA-256 cefb765df56d4d7d…

MALICIOUS

RTF

156.2 KB Created: 2021-07-16 07:42:00
MD5: 8a8b784298e996f77c4c119962719e16 SHA-1: 67f1f9a222198690b1e87d62aee626deecf94a25 SHA-256: cefb765df56d4d7d494741133fea3dcecbfbaf904b82bed493bb9d1b12ab1c79
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 object is processed. The file is classified as malicious due to this exploit. No document body text or scripts were extracted, limiting further analysis of the payload.

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_off00003295.bin
03ddf25502b90819c053546515b4ac03096dfaa5dc6599bb96fda23d78b79d6f		 rtf-objdata-decoded RTF \objdata at offset 0x3295 3629 bytes

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