Malicious RTF — malware analysis report

Static analysis result for SHA-256 91e513a10671bb22…

MALICIOUS

RTF

1.32 MB Created: 2021-07-14 23:49:00
MD5: 778686a4793b07becba5df7dc964af98 SHA-1: 2bea084438db4ef257984f9d43864a39dd66fbc8 SHA-256: 91e513a10671bb221200b17949c5afcce234ac112c59e78c8d2b68478ccb57bd
262 Risk Score

Malware Insights

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

The RTF file contains critical heuristics indicating the exploitation of CVE-2017-11882 via the Equation Editor component. This vulnerability allows for arbitrary code execution, suggesting the file is a malicious document designed to exploit this flaw. The presence of large amounts of hex-encoded data within OLE objects further supports the likelihood of a hidden payload.

Heuristics 7

  • 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.
  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • Equation Editor object class critical RTF_OBJCLASS_EQUATION
    Object class 'equation.3' references Equation Editor
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~1336KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 2 \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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001819.bin
bea89d2d808c4a042210674bb7f25b9f3d9afc0e4daa65fd7adbf82162da1d70		 rtf-objdata-decoded RTF \objdata at offset 0x1819 3628 bytes
objdata_01_off001498bf.bin
1a3ff27c03bac9ab655a63dfdb43398a46de0515ac0d035feac6821565b87984		 rtf-objdata-decoded RTF \objdata at offset 0x1498BF 3570 bytes

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