Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 354a141c4ff4d035…

MALICIOUS

RTF / .DOC

30.7 KB First seen: 2023-06-06
MD5: f7d50cc55175762cb1444c2b0a92a49c SHA-1: 43b8fd80fc1fefb57859b57fe19308426312f3d6 SHA-256: 354a141c4ff4d03516e6182c0b28ab37183972c9e7fc632f08899661f4f7f54d
180 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The RTF document contains an embedded OLE object with a split Equation Editor ProgID, indicating an attempt to exploit a known vulnerability. The 'SE_ENABLE_LURE' heuristic confirms the presence of a message instructing the user to enable editing, a common tactic to bypass security measures. This combination strongly suggests the document is designed to trigger an exploit, likely leading to the download and execution of a secondary payload.

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_off00004514.bin
edd4d59079215346c85e9fb1ef9aa35b5c72f9389c1c953642054815c3e0af68
rtf-objdata-decoded RTF \objdata at offset 0x4514 1683 bytes