Malicious RTF — malware analysis report

Static analysis result for SHA-256 2b1767520a79ec1f…

MALICIOUS

RTF

21.4 KB First seen: 2023-05-18
MD5: 1828f4c2bc4c852fbeedddcc9d5b9c4a SHA-1: 13e95a4a0be3c5e57b4a7af1a0112963aa763b2c SHA-256: 2b1767520a79ec1f477672e696fb5c64d7dc980baf1608a7d74abff3a133d607
160 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution T1204.002 Malicious File T1059 Command and Scripting Interpreter T1059.005 Visual Basic

The RTF file contains an embedded OLE object, specifically identified as an Equation Editor exploit. The document body provides a lure, instructing the user to 'Enable editing' to bypass security measures. This combination strongly suggests the file is designed to exploit the Equation Editor vulnerability to execute malicious code upon user interaction.

Heuristics 5

  • 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
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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_off00002fed.bin
13e90a8871ef129928d6f56b142d81181e41dc25da59a442a63f9d6eb9e80f0b
rtf-objdata-decoded RTF \objdata at offset 0x2FED 1458 bytes