Malicious RTF — malware analysis report

Static analysis result for SHA-256 39fcf7c07a057d97…

MALICIOUS

RTF

4.6 KB
MD5: 481c22b5e46aee29787378d65d00fc92 SHA-1: c661b85631510dbb9010d5c6d0e4ad71bf0d2bae SHA-256: 39fcf7c07a057d9770dd0e5315e47fc23767f00ce3d31cb2e6d91d235415d9d2
120 Risk Score

Malware Insights

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

The RTF file contains embedded OLE object data 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.

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_off000000af.bin
41f3b6c1b70f284c2b89867eaca5b4ba543603560e2e43924b1d23406b7dc9b1		 rtf-objdata-decoded RTF \objdata at offset 0xAF 2072 bytes

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