Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 03b754b284d8fbbf…

MALICIOUS

RTF / .DOC

4.7 KB First seen: 2022-07-07
MD5: 2036ea3a0b4b4b3312a6e59eaffbb702 SHA-1: b35f3166f27bc76892de7a0ee1c426aa61935cd3 SHA-256: 03b754b284d8fbbf094d6d8d28d74154daa0e512c5da2c3b30ba0352a57e66c9
200 Risk Score

Malware Insights

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

The RTF document contains embedded OLE object data, specifically triggering heuristics related to Equation Editor and CVE-2017-11882. This indicates the file is designed to exploit this vulnerability for client-side code execution. No specific family could be identified, but the exploit vector is clear.

Heuristics 5

  • Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED
    RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
  • 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.
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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_off00000080.bin
576727f733eb2ff34aab3b500d66f2eebb9216a0e92e223429119bf757454c19		 rtf-objdata-decoded RTF \objdata at offset 0x80 1998 bytes

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