Malicious RTF — malware analysis report

Static analysis result for SHA-256 032689c6fafc5e7c…

MALICIOUS

RTF

4.7 KB
MD5: 86dd4824c3b2cb50dbdda5877b95f602 SHA-1: 3557ef843bd9df48a2bceb8390786253aa49189f SHA-256: 032689c6fafc5e7c528d72ab5f78a1af73a7d6442ef698b098c2f54daf473405
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 exploits the Equation Editor vulnerability (CVE-2017-11882). The ".objupdate" directive forces the activation of this object, leading to arbitrary code execution. The specific ProgID "eqUaTIon.3" is indicative 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_off000000d8.bin
811a1e6a743d9837bb51e1242207e6c2c6be98d296bdb8cc9b5c4a2d2ad05759		 rtf-objdata-decoded RTF \objdata at offset 0xD8 2094 bytes

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