Malicious RTF — malware analysis report

Static analysis result for SHA-256 7e5a8adbf13e914e…

MALICIOUS

RTF

478.5 KB First seen: 2019-05-16
MD5: efae965b20b0e60b85a1ae9e9c0e6e34 SHA-1: 4de211878561ca67fe1227776ec45922c0c48570 SHA-256: 7e5a8adbf13e914ea01734c4c5ae3486720b24116562e439babfc0795266497f
140 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains critical heuristics indicating the exploitation of the Equation Editor vulnerability (RTF_EQUATION_EDITOR) and the use of OLE objects (RTF_OBJDATA, RTF_OBJEMB, RTF_OBJUPDATE). This strongly suggests the file is designed to execute arbitrary code, likely by downloading a second-stage payload. No document body or script content was available for further analysis.

Heuristics 4

  • Split hex Equation Editor ProgID + OLE object critical CVE likely 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 1 \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_off000728fd.bin rtf-objdata-decoded RTF \objdata at offset 0x728FD 2099 bytes
SHA-256: f6d704bf5f7fa4cd9de10f0d15c750b5089fff52f28a2b1f11ea0f0ca0350771

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