Malicious RTF — malware analysis report

Static analysis result for SHA-256 dc6080f687156377…

MALICIOUS

RTF

1.39 MB
MD5: 6369c4aed8ff9f167224f4cbe04ed0c6 SHA-1: 174ce1f34cf2b794d421089197d1f607e988dbc2 SHA-256: dc6080f6871563778eb833958731b2dc1012dc3287d40ba4f09afe59e326d591
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.002 Component Object Model

The RTF file contains embedded OLE objects, specifically triggering the Equation Editor vulnerability (CVE-2017-11882). This vulnerability allows for the execution of arbitrary code when the embedded object is activated, which is forced by the \objupdate directive. No document body or scripts were extracted, but the exploit itself is clearly indicated by the heuristics.

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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000011e1.bin
842bcac84c9672a0340a1ba19797e72d5a4796a84324d051551459dc9853e627		 rtf-objdata-decoded RTF \objdata at offset 0x11E1 53277 bytes
objdata_01_off0002ec8b.bin
5d913e0bdd4543b59117490fda1dba3c38edbcd2b81c5376d07402a696f7c2ab		 rtf-objdata-decoded RTF \objdata at offset 0x2EC8B 346025 bytes

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