Malicious RTF — malware analysis report

Static analysis result for SHA-256 f1ca966a6f8af593…

MALICIOUS

RTF

4.3 KB First seen: 2021-06-20
MD5: 61ef8136914adebdf5a862d68e6e675b SHA-1: 0e831d081034a7e255f0e65ea261f5406d929201 SHA-256: f1ca966a6f8af593eff11a7c175f9ae362d7680f5c83b7e7c5aa47b94f77f4ee
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains embedded OLE objects and specifically triggers the Equation Editor vulnerability. The presence of ".objupdate" indicates an attempt to force the activation of the embedded object, leading to the exploitation of the Equation Editor vulnerability for arbitrary code execution.

Heuristics 3

  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000081.bin rtf-objdata-decoded RTF \objdata at offset 0x81 1894 bytes
SHA-256: ea0310595564a8613dee1070985e2cb525bae9e8532494890aa7ef46c3322ba1

Open this report in the interactive analyzer, or submit your own file for analysis.