Malicious RTF — malware analysis report

Static analysis result for SHA-256 70f35721eb13022a…

MALICIOUS

RTF

8.8 KB
MD5: 7426da962e68c5b20a5159ca4e911eee SHA-1: a3a37b190077a308a17ddb82aa545610807f6e8b SHA-256: 70f35721eb13022a6ae320055bf74d8c3bf688d5cd04c3bea37f6c2e4886d1b3
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 triggers heuristics related to the Equation Editor vulnerability and OLE object activation. This indicates the file is designed to exploit a known vulnerability to execute arbitrary code, likely downloading a secondary payload. The embedded OLE object data is the primary indicator of compromise.

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 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000ca5.bin
06bee319d671f10fbc8979cec67c1ded7c086435cfd8cb7a562ec26eb87ef7da		 rtf-objdata-decoded RTF \objdata at offset 0xCA5 1707 bytes

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