Malicious RTF — malware analysis report

Static analysis result for SHA-256 7066b65d6914bfab…

MALICIOUS

RTF

16.7 KB
MD5: 1e7dde8a22b6c000f20341cebd012402 SHA-1: 7ed99272e3418f89d67f07826468b84761d1c30c SHA-256: 7066b65d6914bfab696ebc1f6f1bd486375d9526b5c73644554a57e42ed8b67a
180 Risk Score

Malware Insights

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

The RTF document contains embedded OLE objects, specifically triggering a critical heuristic for the Equation Editor. This indicates exploitation of CVE-2017-11882, which allows for arbitrary code execution. The presence of the 'EQuAtiON.3' ProgID is a key indicator for 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_off000007a3.bin
98b9de690198107d1bb07aabf0f56b9ec017f84dc401946836cc4cd70c5aaa40		 rtf-objdata-decoded RTF \objdata at offset 0x7A3 1508 bytes

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