Malicious RTF — malware analysis report

Static analysis result for SHA-256 7043c4eec651d7f1…

MALICIOUS

RTF

3.7 KB
MD5: 0913167d7db7e16aa2a57738b3ac1339 SHA-1: fac62b6d9821256b91223ecefeacd93652f72578 SHA-256: 7043c4eec651d7f149230e29b95c3fb311b350ae6218c9e3ce4dc90266629734
120 Risk Score

Malware Insights

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

The RTF file contains embedded OLE objects and specifically triggers heuristics related to the Equation Editor vulnerability. This indicates the file is designed to exploit a known vulnerability in the Equation Editor component to achieve code execution upon opening. The presence of ".objupdate" further suggests an attempt to force OLE object activation, likely to trigger the exploit.

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_off00000083.bin
f2ca0da61e95cf9c3a304d6df1ee7334d36ca68116517131d13ce1fbfabddcc6		 rtf-objdata-decoded RTF \objdata at offset 0x83 1588 bytes

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