Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 a4dc28a4d88f3ebe…

MALICIOUS

RTF / .DOC

4.5 KB
MD5: a9eda8efe0588de2175c1c9fd42155e5 SHA-1: 88d8e015c535b8e639aa8e512003c8382f3b8ed6 SHA-256: a4dc28a4d88f3ebed9d958e399e5d01c6b086404132967adec80ac8c9cc9bbcc
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell

The RTF document contains an embedded OLE object specifically identified as related to the Equation Editor vulnerability CVE-2017-11882. The presence of RTF_OBJDATA, RTF_OBJEMB, RTF_EQUATION_EDITOR, and RTF_OBJUPDATE heuristics strongly indicates that this file is designed to exploit this known Microsoft Office vulnerability. The exploit likely leads to arbitrary code execution, although no specific payload or second-stage activity was observed in the static analysis.

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_off00000096.bin
c2d18d86951c2a121c313558bcb03e512b5d18dfd19cb14e3ae14c308e741695		 rtf-objdata-decoded RTF \objdata at offset 0x96 2054 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.