Malicious RTF — malware analysis report

Static analysis result for SHA-256 2de9837a499a33f4…

MALICIOUS

RTF

53.3 KB
MD5: b38108328046da796a81ccd59bbd0b2b SHA-1: 7085d7db0c107f7b894eb751b7f74ef3ac54f703 SHA-256: 2de9837a499a33f4c3d1190df9ddcb79f99719ffdd49580316de56e76d4abb61
180 Risk Score

Malware Insights

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

The RTF document contains embedded OLE object data, specifically triggering the CVE-2017-11882 vulnerability related to Equation Editor. This exploit allows for arbitrary code execution, likely as a first stage to download and run a secondary payload. The presence of RTF_OBJDATA, RTF_OBJEMB, RTF_EQUATION_EDITOR, and RTF_OBJUPDATE heuristics strongly indicates 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_off00000fcd.bin
359dcd8b3d924da6f3012c7eb6aa89db3d7f0552a095ba0131da52b6547e3b76		 rtf-objdata-decoded RTF \objdata at offset 0xFCD 1772 bytes

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