Malicious RTF — malware analysis report

Static analysis result for SHA-256 721447f1c6631ab5…

MALICIOUS

RTF

56.0 KB
MD5: e33657b906ca1f3bab25c1b9005e01cf SHA-1: a958a83113187c2f0f1d8df9ec0b25c607163e40 SHA-256: 721447f1c6631ab52fa5dcbd7ee9a7c22bf67469871a0ed3e8a006ab77069a96
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 document is opened, likely leading to the download and execution of a secondary payload. 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_off00000108.bin
33c672d5361b4b1298f1e13708a137c660019824c7fb843466f2d54c61373567		 rtf-objdata-decoded RTF \objdata at offset 0x108 3631 bytes

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