Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 48252096cbcf7101…

MALICIOUS

RTF / .DOC

41.5 KB First seen: 2023-05-23
MD5: 29a3e5a1d3864ce5b85ac5116f5ae844 SHA-1: 50cc73a3268ed9e343fc33a47b265c9c4cd3437d SHA-256: 48252096cbcf7101b317519ab2c9c59302983f035c3764678060f6782eeaa88c
180 Risk Score

Malware Insights

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

The RTF document contains multiple indicators of malicious intent, including the presence of OLE object data, an automatically linked OLE object, and specifically the Equation Editor ProgID. The 'SE_ENABLE_LURE' heuristic indicates that the document explicitly instructs the user to enable editing, a common social engineering tactic to bypass macro security. This suggests the document is designed to exploit a vulnerability via the embedded OLE object 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.
  • 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_off0000550d.bin
c8efe9f28381f1a096a21257a267300dce07b3bcbf301d655c00468fcce229e0
rtf-objdata-decoded RTF \objdata at offset 0x550D 1688 bytes