Malicious RTF — malware analysis report

Static analysis result for SHA-256 35a12f062cf89d2c…

MALICIOUS

RTF

15.8 KB First seen: 2023-03-17
MD5: 86fc671549dae9122a212b2d0866518d SHA-1: 6dae20a1f000b592f2b7b567b7ac6e02b60d6aaa SHA-256: 35a12f062cf89d2ce795bca9ae9ecd96ee09df1f7f701acb7b122b466c2d7501
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1105 Ingress Tool Transfer

The sample is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. The presence of ` tf1 0 s24{\fonttbl{\f0 Arial;}} \pard\sa200\sl276\slmult1\f0\fs24\lang9 This is a test document.\par \pard\sa200\sl276\slmult1\f0\fs24\lang9 \object\objclass Equation.3\objw11906\objh9370\objscalex100\objscaley100\objemb\wmetafile8\pict\wmetafile8\picw11906\pich9370\picwgoal11906\pichgoal9370\objdata 7405

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 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002045.bin
28074026cabe5ef07199885e902d2d9c55fc930660fb52629d4d1ffb4d506952		 rtf-objdata-decoded RTF \objdata at offset 0x2045 1672 bytes

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