Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 96cce33cca8b3a02…

MALICIOUS

RTF / .DOC

41.7 KB First seen: 2023-02-09
MD5: 63105821dee03d72fe243acebf51ad1a SHA-1: d5abf2c7398dec63c27d7b119ed88bc2e3941308 SHA-256: 96cce33cca8b3a0296c28f1e228821fe65afa896d1b22cbabefa5839de68e0e5
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution 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' to view its content. This combination strongly suggests the document is designed to exploit CVE-2017-11882, leading to the execution of a secondary payload. No specific family could be identified.

Heuristics 4

  • 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
  • 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_off00005ae6.bin
28310e78286d02e15ae9317d1dd1252f6331d0d9f13d2007ab271bde862acf35
rtf-objdata-decoded RTF \objdata at offset 0x5AE6 1871 bytes