Malicious RTF — malware analysis report

Static analysis result for SHA-256 702f996223dd6538…

MALICIOUS

RTF

61.0 KB
MD5: ef4013fd387e03e4aae8c604e5f52d6f SHA-1: 94c3f95ecfd081f4353223ff785fe9a0d1301555 SHA-256: 702f996223dd65389f23ee3a14aeaa325c920733e539ea53476696588cdedfbc
160 Risk Score

Malware Insights

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

The sample is an RTF document containing an embedded OLE object that exploits the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution, likely to download and run a secondary payload. The presence of the Equation Editor CLSID and the specific CVE firing strongly indicate 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_off00000112.bin
c374937f3eb59983b74d669b13cb8f3a49f52751301cd4cb0e6bf1200a1d866f		 rtf-objdata-decoded RTF \objdata at offset 0x112 3631 bytes

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