Malicious RTF — malware analysis report

Static analysis result for SHA-256 db44e2b7adfaadc6…

MALICIOUS

RTF

4.9 KB
MD5: 977409c6e812a97727eaa45e2359744c SHA-1: 13af8bcb35492171b1dbab484650319d315ef8ec SHA-256: db44e2b7adfaadc6bf2e2093aa43a11661dfd6e0f84159bf0c1171a86cdb7e65
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 an attempt to exploit a known vulnerability for client-side code execution. The presence of ".objupdate" suggests the OLE object is designed to activate automatically upon opening, 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_off000000d6.bin
d7ad299cf3b3ee9e380ab837d319651deb67090288a6b970be60600e6183f3b4		 rtf-objdata-decoded RTF \objdata at offset 0xD6 2219 bytes

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