Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 2c32b26ced7d44aa…

MALICIOUS

RTF / .DOC

18.2 KB First seen: 2023-04-26
MD5: 79b5e9474377b7fc1fb037e24014f7de SHA-1: bf8300d0fdf6a65de5a0f6bedf73de53afb318d8 SHA-256: 2c32b26ced7d44aa8b7f0eb8cfebb3c2f0c78f61d7e778c5672511a0b623c858
160 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution: Malicious Link T1059 Command and Scripting Interpreter

The file is an RTF document containing an embedded OLE object, specifically targeting the Equation Editor vulnerability. The document body includes a lure instructing the user to 'Enable editing', which is a common tactic for macro-based malware droppers. The critical RTF_EQUATION_EDITOR heuristic indicates a high likelihood of exploit execution upon user interaction.

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.
  • \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
  • 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_off00002503.bin
e6a018d8c762f37e43d12b16b8d0534d3af5fa1cb2ba451c950470120e9b96b8
rtf-objdata-decoded RTF \objdata at offset 0x2503 1432 bytes