Malicious RTF — malware analysis report

Static analysis result for SHA-256 6bc786d07a7934cf…

MALICIOUS

RTF

1.82 MB
MD5: 450b3982bf31663bc7f9c04dc480d5fd SHA-1: 9304475e8ea1f6e0675b021110274d30ac83e245 SHA-256: 6bc786d07a7934cffeb69fb03c63917a640562e606d1db3660a416f98561f6b8
180 Risk Score

Malware Insights

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

The RTF file contains embedded OLE objects, specifically triggering heuristics related to Equation Editor and CVE-2017-11882. This indicates the file is designed to exploit this known vulnerability for code execution. The presence of ".objupdate" further suggests an attempt to force OLE object activation. 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.
  • \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
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000011e1.bin
1d5a1705e0e71c0011877273fdd300f26a9e7df5867c2b63f96b8b446dab2890		 rtf-objdata-decoded RTF \objdata at offset 0x11E1 53488 bytes
objdata_01_off0002ee31.bin
7d01ee387216102daeabf80a57c8f0d8112fdee1d8864b417a3fb9d69aa1d0dd		 rtf-objdata-decoded RTF \objdata at offset 0x2EE31 469226 bytes

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