Malicious RTF — malware analysis report

Static analysis result for SHA-256 4b04f4a72b95700c…

MALICIOUS

RTF

78.6 KB
MD5: d9c684f230320d4e1b13cf13ccb9acaa SHA-1: 5fbdac99f5d3ab628b03635bb0a38af95e486151 SHA-256: 4b04f4a72b95700cf59464f92c52f46d6d8d8c6d854b0ec7a4b0938dab9c471d
160 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 triggers 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.

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.
  • 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
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002356.bin
181d68099739468201fb1c92ea1c3c75bcb5561d9a193e776b763aaad57f1140		 rtf-objdata-decoded RTF \objdata at offset 0x2356 3631 bytes

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