Malicious RTF — malware analysis report

Static analysis result for SHA-256 6cdd13858c80732f…

MALICIOUS

RTF

12.0 KB
MD5: 94c2c8723c5275bbc57c76fca34e94f0 SHA-1: 72c4c96f97fa9d21ba422d1972ca0ef853d8608d SHA-256: 6cdd13858c80732f5bcae5a998b2cc4402ee5c549b7042594b0edec313671a6f
180 Risk Score

Malware Insights

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

The RTF document contains an embedded OLE object that triggers the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This exploit allows for arbitrary code execution, which is typically used to download and run a second-stage malicious payload. The presence of the 'eQUAtIOn.3' class name is a strong indicator of this specific exploit.

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 1 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001756.bin
32f97464ea2bc7f1962c6cc698d4d8f5b2383e49b0450a0eef5ee1180b74dbf9		 rtf-objdata-decoded RTF \objdata at offset 0x1756 2003 bytes

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