Malicious RTF — malware analysis report

Static analysis result for SHA-256 7329917ceedacd33…

MALICIOUS

RTF

50.1 KB
MD5: 1a4bc302eb0f26f22b0e11fedfbf2f64 SHA-1: c9c11eab80d05d7329c34cc79b7767ebafda641a SHA-256: 7329917ceedacd33eac0882ec3fcbb0bdc47da81ab9d23d8defe49f0fcca33df
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 leverages the Equation Editor, specifically triggering CVE-2017-11882. This exploit is designed to execute arbitrary code, likely leading to the download and execution of a secondary payload. The presence of the Equation Editor ProgID '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 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_off00000f93.bin
c6f6ea453ae11af8071bb5842f39233bb34661b3e3c84a4651779c928dea8161		 rtf-objdata-decoded RTF \objdata at offset 0xF93 2087 bytes

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