Malicious RTF — malware analysis report

Static analysis result for SHA-256 562ca6379154c5a9…

MALICIOUS

RTF

52.9 KB
MD5: 36bab8f8fa07520975ee1dc8d56e642e SHA-1: bb4cbd837e109f38c904c42e017bc667db1fff30 SHA-256: 562ca6379154c5a937e678052eddb80ce08cc0c4ced84974fec32f126479c630
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 leverages a known vulnerability in Microsoft Equation Editor (CVE-2017-11882). This vulnerability allows for arbitrary code execution when the object is processed. The presence of the OLE object and the specific Equation Editor CLSID strongly indicate exploitation for client execution, likely delivered as a spearphishing attachment.

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_off00000112.bin
a8f326211ae251423fc63cbfd095b4ec289ecfcaf5a731f7f5fbbf58c59a189d		 rtf-objdata-decoded RTF \objdata at offset 0x112 3631 bytes

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