Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 50c3ea6070dee7d2…

MALICIOUS

RTF / .DOC

39.6 KB First seen: 2023-05-26
MD5: 711a1ce28c6046140c925891efb2efdf SHA-1: 0664c5601fa22afba36f8e0d100a37b4a6c5426d SHA-256: 50c3ea6070dee7d283807af750a6df61fd63205c4b25edb9bc88ee4b03a9ad73
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 embedded OLE objects and an Equation Editor exploit. The 'SE_ENABLE_LURE' heuristic indicates the document likely prompts the user to enable editing or macros, a common social engineering tactic. The presence of RTF-specific exploit indicators suggests the file aims to leverage a vulnerability to execute a 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_off0000500d.bin
5c9e9f4a9bd15642e97cee8769158f673ce687e10dc5342ab621b8916f0413b8
rtf-objdata-decoded RTF \objdata at offset 0x500D 1835 bytes