equation editor exploit — RTF malware analysis

Static analysis result for SHA-256 ca0950806dbbf9fb…

MALICIOUS

RTF

8.2 KB First seen: 2019-05-31
MD5: ede5985401d5c9b312af80aa1f1fe36e SHA-1: acb50db29b4be5dc22c47c63103b125e3e8c2ba9 SHA-256: ca0950806dbbf9fb7cc13e11e70ba966454ca6f1e8c4d2bdcf9e8eff0f866aae
120 Risk Score

Malware Insights

equation editor exploit · confidence 95%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability. The presence of RTF_EQUATION_EDITOR and RTF_OBJUPDATE heuristics strongly indicates exploitation of this component. This technique allows for arbitrary code execution on the victim's machine.

Heuristics 3

  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • \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 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000033.bin rtf-objdata-decoded RTF \objdata at offset 0x33 4147 bytes
SHA-256: 21260d4b14cf0c080a4bb4c42fbe8df1f5c01b459be800a7eb104a5d236f3e15

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