Malicious RTF — malware analysis report

Static analysis result for SHA-256 dab3e0845261a8d9…

MALICIOUS

RTF

35.5 KB
MD5: ebcbbbb4c2920b3df80cd824ddd4e232 SHA-1: d1fbd70a4dc14fd9e8942626b1dd3d9a593eda38 SHA-256: dab3e0845261a8d943d13693fcf901601ce609d6557ac447ef588024a1f52013
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of exploitation targeting the Equation Editor vulnerability, specifically the 'RTF_EQUATION_EDITOR' and 'RTF_OBJUPDATE' heuristics. This technique is commonly used to achieve arbitrary code execution, likely to download and run a secondary payload. The presence of OLE object data further supports this attack vector.

Heuristics 3

  • Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR
    RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
  • \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 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001f55.bin
f568f403f5552371925e0bfd2a7d6b840d4e745cec4495796e5de76e75fecc13		 rtf-objdata-decoded RTF \objdata at offset 0x1F55 1416 bytes

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