Malicious RTF — malware analysis report

Static analysis result for SHA-256 5a86c42f4cde3bfb…

MALICIOUS

RTF

4.3 KB First seen: 2021-09-25
MD5: 6e844766be2697f2507cdd8709af3d18 SHA-1: d8f4a9ba2831a76364c45c5cf911d105c5c0c459 SHA-256: 5a86c42f4cde3bfb98e42f99e9a6baa21b5721cf82c2d4d8f603989d48a3e216
120 Risk Score

Malware Insights

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

The RTF file contains OLE objects and specifically triggers heuristics for a split hex Equation Editor ProgID, indicating exploitation of a vulnerability within the Equation Editor component. The \objupdate directive forces OLE object activation, leading to arbitrary code execution. No specific family is identifiable from the provided evidence.

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_off000000bc.bin rtf-objdata-decoded RTF \objdata at offset 0xBC 1897 bytes
SHA-256: d93ca053a997c4d80572bc15d89e0161196785529730abd7edb4c16a40121061

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