Malicious RTF — malware analysis report

Static analysis result for SHA-256 48e5c7bdb837211e…

MALICIOUS

RTF

3.7 KB
MD5: 1dca3d4c9b3e914e5f58b24b5f46e3ac SHA-1: 67f948d700b2c148ff94c262da294f0e86aa472d SHA-256: 48e5c7bdb837211ed2cd2913fa64cc5f821101903c10c28d13c8b83509079e14
180 Risk Score

Malware Insights

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

The RTF file contains embedded OLE object data and specifically triggers the Equation Editor vulnerability (CVE-2017-11882). This vulnerability allows for the execution of arbitrary code when the embedded object is activated, likely through a ".objupdate" directive. The presence of the Equation Editor ProgID 'EqUAtIoN.3' further confirms the exploitation vector.

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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000000a6.bin
71c8cb2a6e39f6b3423f2a750df4f8bb65f03f4cbff17e8f39c4cb87c8499202		 rtf-objdata-decoded RTF \objdata at offset 0xA6 1651 bytes

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