Malicious RTF — malware analysis report

Static analysis result for SHA-256 1228ba2604d0a579…

MALICIOUS

RTF

9.7 KB
MD5: 926c7c3b1010b8599d883fd9caa04227 SHA-1: 2dc226296b29273f64c702f69e21cc5a05680bd6 SHA-256: 1228ba2604d0a579845a1dfdc24e4923c184e1295d2af972063d76d64b33ef99
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object that exploits the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This vulnerability is known to be used to execute arbitrary code, typically to download and run a second-stage payload. The specific class name 'eQuATIon.3' is a strong indicator of this 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_off0000138c.bin
cd890fbcc05c7694b27e17e64ae48bda79a4905d7461181bb5e5cdb80f78e8bd		 rtf-objdata-decoded RTF \objdata at offset 0x138C 1764 bytes

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