Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 581b7806f9827e64…

MALICIOUS

RTF / .DOC

36.3 KB First seen: 2023-05-30
MD5: ba60433016547b1a8c42181c44b47cb4 SHA-1: cb13636f2986a12e69f9ea53526c80b8f9d12353 SHA-256: 581b7806f9827e643a0bfd87ff0b31c6c1e62db11ca7d27138708995470a58be
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains multiple indicators of exploitation targeting Microsoft Equation Editor, including OLE object data and automatic linking. The presence of a 'SE_ENABLE_LURE' heuristic suggests the document prompts the user to enable editing, a common tactic for malware droppers to bypass security measures and trigger embedded exploits.

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_off00004dc2.bin
025100cbc3f760b8424ed4418151516621ea5dec8c7148483d0086e02d5e442e
rtf-objdata-decoded RTF \objdata at offset 0x4DC2 2182 bytes