Malicious RTF — malware analysis report

Static analysis result for SHA-256 ccd0bd892935d6df…

MALICIOUS

RTF

68.2 KB First seen: 2019-05-16
MD5: 9a59397fbcc8aea517902f3c43804321 SHA-1: e75b6eaaf8bee4bcff13bf1d3e748c48bd637029 SHA-256: ccd0bd892935d6dfaca4f3110ad7b0555cd720498ead56abe43894597137f988
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object with a split Equation Editor ProgID, indicating an attempt to exploit a known vulnerability. The \objupdate field further suggests that the embedded object is designed to be activated automatically, leading to the execution of arbitrary code. No document body text was available for further analysis.

Heuristics 3

  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000f222.bin rtf-objdata-decoded RTF \objdata at offset 0xF222 1833 bytes
SHA-256: e3bfc5e1871027697583a60e628ffe54fcde7cae8380a07f7813590f265ee4fc

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