Malicious RTF — malware analysis report

Static analysis result for SHA-256 2e30907ebfafe954…

MALICIOUS

RTF

7.2 KB First seen: 2019-12-09
MD5: 1e8f51413c1fdee66e8d19dc47869bd4 SHA-1: 35e7e2619e724788e24cac2f0b14198619e54275 SHA-256: 2e30907ebfafe954f3184e0310c5c98bcae55255963189e90a4e85f263a7bf36
220 Risk Score

Malware Insights

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

The RTF file contains critical heuristic firings indicating the exploitation of CVE-2017-11882 via Microsoft Equation Editor. This vulnerability allows for arbitrary code execution, suggesting the file is designed to deliver a malicious payload. The presence of OLE object data and an automatically linked OLE object further supports the exploitation vector.

Heuristics 5

  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • 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.
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000036.bin rtf-objdata-decoded RTF \objdata at offset 0x36 3641 bytes
SHA-256: c7779343e7d6f94ac254afadad952e3673e2275d9521c79b3e95042f271bb241

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