Malicious RTF — malware analysis report

Static analysis result for SHA-256 15655af972b63296…

MALICIOUS

RTF

9.8 KB
MD5: b115f24fcecce5e8661300527a748448 SHA-1: 9673703628a2edf4fea0b3a764357f82b4c9ce9f SHA-256: 15655af972b632964f3327334c8809fb6cd6cd04e43f4548a32a5bb5743a75bc
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. This exploit is designed to execute arbitrary code, likely leading to the download and execution of a secondary payload. The presence of the ".bin" file suggests a dropped executable or script.

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_off00001462.bin
8c7cf5545bc725bf1b12ecde4dd2b3dcd55029386c817a82aa706c86da18233a		 rtf-objdata-decoded RTF \objdata at offset 0x1462 1741 bytes

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