Malicious RTF — malware analysis report

Static analysis result for SHA-256 06f834721d27c694…

MALICIOUS

RTF

30.7 KB First seen: 2023-05-30
MD5: bf084f461abb357afd8a709cbced50da SHA-1: 527a62ef447061353dd565f1ca40262374c62ca4 SHA-256: 06f834721d27c694168d0dec35973c0e4436b706edac0e89b37ea07facdf6236
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1059.005 PowerShell

The RTF document contains embedded OLE object data and specifically targets the Equation Editor vulnerability, indicated by the 'RTF_EQUATION_EDITOR' and 'RTF_OBJUPDATE' heuristics. The 'SE_ENABLE_LURE' heuristic confirms the presence of a prompt instructing the user to enable editing, a common social engineering tactic to bypass security measures. This combination strongly suggests an exploit attempt leveraging a known Microsoft Office vulnerability.

Heuristics 4

  • 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 1 \objdata section(s) — embedded OLE objects
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000047e1.bin
64b02e7e9a1f41e12421f855c50cfe04eb22f75717956621063415e11b2e12a4
rtf-objdata-decoded RTF \objdata at offset 0x47E1 1634 bytes