Malicious RTF — malware analysis report

Static analysis result for SHA-256 b13d86e398cddf18…

MALICIOUS

RTF

4.1 KB
MD5: 31e838a075a0df704b67e979c9b2e0ec SHA-1: 8e3047303e2c5bc2fd04e93bfb0964321e43513d SHA-256: b13d86e398cddf186780ceb3ca9c8f9ff88c957ceff53aeb00de3f5207391159
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 Microsoft Equation Editor 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_off0000007a.bin
01f1c7ce86f5fef2fe9c63aa2047db8ff41ea0c24bf2b0bffda036d221de0041		 rtf-objdata-decoded RTF \objdata at offset 0x7A 1871 bytes

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