Malicious RTF — malware analysis report

Static analysis result for SHA-256 758572b4a482bd4f…

MALICIOUS

RTF

38.8 KB First seen: 2023-07-25
MD5: bd86259ef85ed5eb85469ffb5702242c SHA-1: 5684cff108fdf071b2780ff0606f95a47bfcc398 SHA-256: 758572b4a482bd4f60e05e1cd8669396ade4eb0a0be89effeb88428658c0debb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution: Malicious Link T1059.005 PowerShell T1204.002 User Execution: Malicious File

The RTF document contains an embedded OLE object and specifically triggers the Equation Editor exploit. The 'SE_ENABLE_LURE' heuristic indicates the document likely instructs the user to enable editing, a common tactic for macro-based malware. This combination strongly suggests an attempt to exploit the Equation Editor vulnerability to achieve code 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.
  • \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_off0000413c.bin
680c947f0c70955db0bd18c3d35a903f3b749a4b57753311eb6690913b1cb662
rtf-objdata-decoded RTF \objdata at offset 0x413C 1639 bytes