Malicious RTF — malware analysis report

Static analysis result for SHA-256 09f1ea01f3f2bf8e…

MALICIOUS

RTF

10.9 KB
MD5: a19eabf7fb153b7d9481cbd5a2957e5d SHA-1: 3647619ef94b0e2d9c6fd42bea0ad519779359bb SHA-256: 09f1ea01f3f2bf8e49e3af69a3069421150ac2983e1a6a5bc258bcc245604a50
120 Risk Score

Malware Insights

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

The RTF document contains OLE object data and specifically triggers heuristics for the Equation Editor vulnerability and object updates. This indicates an attempt to exploit a known vulnerability for code execution. The presence of these indicators strongly suggests the file is designed to download and execute a secondary payload, although the specific payload or destination could not be determined from the provided evidence.

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 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001a45.bin
ce93d9b4863a5439fa0444db1565369fdad54638635124d512dca59b243dd0b4		 rtf-objdata-decoded RTF \objdata at offset 0x1A45 1554 bytes

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