Malicious RTF — malware analysis report

Static analysis result for SHA-256 1d548fc3dd617680…

MALICIOUS

RTF

55.6 KB
MD5: 8fbc8c146d6e11cc75dd5e1d09ebd4c3 SHA-1: c0e07b87d5e691f35da95c6be4a9996b2c4bdb3e SHA-256: 1d548fc3dd617680aee368f1878a4fb9d86770919c7328e9ce8d3f7da893c6d1
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, likely to download and run a second-stage payload. The presence of the Equation Editor CLSID and the decoded RTF object data 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_off0000010e.bin
2db39c27453c524da1ed55b4b87efc6a59b1952400053b23ced2edfbaf9359d1		 rtf-objdata-decoded RTF \objdata at offset 0x10E 3631 bytes

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