Malicious RTF — malware analysis report

Static analysis result for SHA-256 2fde682408b1f653…

MALICIOUS

RTF

38.2 KB
MD5: 754b626920802fc9cd5439559b05937c SHA-1: 4a219dfcf4146e8b0cb73e7c766ed2cb4eaddb1c SHA-256: 2fde682408b1f653cc5c569b46853098f10f0b054fda70cc944fd04cf72688c8
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 targets the Equation Editor vulnerability, as indicated by the 'RTF_EQUATION_EDITOR' and 'RTF_OBJUPDATE' heuristic firings. This exploit is designed to achieve code execution on the victim's machine, likely to download and execute a further stage of malware. No document body or script content was available for further analysis.

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_off000013d2.bin
45e5996fe22d9d9a4adf43595e066760347046df94c354ef0bffa800ae22ab90		 rtf-objdata-decoded RTF \objdata at offset 0x13D2 1519 bytes

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