Malicious RTF — malware analysis report

Static analysis result for SHA-256 ec08f86d08819b2a…

MALICIOUS

RTF

4.9 KB
MD5: 6376c3250d983f7520d6b5d329943aea SHA-1: 29219150c2ba89e7ae0265393abcd527b83ded84 SHA-256: ec08f86d08819b2acfa51efb494d21614c86a9024aa47680152ee5ec2f774a38
180 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object with a ProgID indicative of Equation Editor, triggering heuristics related to CVE-2017-11882. This vulnerability is known to allow for arbitrary code execution when the object is activated, likely through the \objupdate directive. The file is classified as malicious due to 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_off000000c7.bin
7518302d0e36aba52ef70416cbbffd206e3a5201e77f70351a988c29138514b9		 rtf-objdata-decoded RTF \objdata at offset 0xC7 2214 bytes

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