Malicious RTF — malware analysis report

Static analysis result for SHA-256 bba89f55ddb519b2…

MALICIOUS

RTF

43.5 KB First seen: 2023-07-12
MD5: 0fcc6667be74591f883fd8e602f7da28 SHA-1: 8e6347899878d6f841b558216dc5ad695df1adf2 SHA-256: bba89f55ddb519b233864edcb9046d8866b3377489bd1b6eee057b5f83448a7f
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.005 Visual Basic

The RTF document contains multiple indicators of exploitation targeting Microsoft Equation Editor, including OLE object data and specific ProgIDs. The 'SE_ENABLE_LURE' heuristic indicates the document prompts the user to enable editing, a common social engineering tactic. This suggests the file is designed to exploit a vulnerability, likely via the embedded OLE object, to achieve initial execution.

Heuristics 5

  • 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.
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00005a6f.bin
8f45dad7a94c6189421d75a6bdf5969da1da18f9f80125a43c83bc60817be6cb
rtf-objdata-decoded RTF \objdata at offset 0x5A6F 1746 bytes