Malicious RTF — malware analysis report

Static analysis result for SHA-256 737fd8bc3c6c6003…

MALICIOUS

RTF

56.3 KB
MD5: 3e343f8dd938a6f269c430c0440a1da4 SHA-1: f768f87c4089f277bc60f138830c09c22e0e7fb5 SHA-256: 737fd8bc3c6c60031b9f2edfa567fc371143a897751a676bcaed3f8260de25ca
160 Risk Score

Malware Insights

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

The RTF document contains an embedded OLE object that triggers CVE-2017-11882, a known vulnerability in Microsoft Equation Editor. This exploit allows for arbitrary code execution, likely to download and run a secondary payload. The presence of OLE object data and specific Equation Editor CLSID firings strongly indicate this attack vector.

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_off00000110.bin
12b2e6f3c2d5ae2df689b7dbee3ff291bdb20eaec7a29eacde38b5a99a8c4180		 rtf-objdata-decoded RTF \objdata at offset 0x110 3631 bytes

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