equation-editor-exploit — RTF malware analysis

Static analysis result for SHA-256 b5491e60c3241d57…

MALICIOUS

RTF

8.1 KB First seen: 2019-08-04
MD5: d09d3a238225fa2eac37167895dd3b53 SHA-1: 5934027548e0f5b7f21c0a31c94a7b2bbc63bfe6 SHA-256: b5491e60c3241d57adc035bd16f5d9b46276b6cf6a6406fbe3535f717a557f3b
120 Risk Score

Malware Insights

equation-editor-exploit · confidence 95%

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

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability. This technique is commonly used to deliver a malicious payload via spearphishing attachments. The critical heuristic firing for Equation Editor CLSID and the objupdate rule strongly indicate exploitation for client execution.

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 4132 bytes
SHA-256: 98215a5af2dfe7bb2dcd13507235b89703c78b3d5269171cb82a5d12812bd6dd

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