Malicious RTF — malware analysis report

Static analysis result for SHA-256 b1e9eb305d85f286…

MALICIOUS

RTF

57.9 KB
MD5: 90737d46fb8389e4492f56ac8b74d775 SHA-1: 4e9cff61af2937a7600a024cc7b5a659d757311d SHA-256: b1e9eb305d85f286f82b723f958285db86829eb8361f5113dbb9245563311f68
160 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

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 critical heuristic firings strongly indicate exploitation of this specific CVE. No further stages or IOCs were extracted from this sample.

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_off0000010b.bin
1f44dd76a24ba0ecf61e5c4868faf71e02dfbe5c9e5d2e2e53579400b42b934d		 rtf-objdata-decoded RTF \objdata at offset 0x10B 3631 bytes

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