Malicious RTF — malware analysis report

Static analysis result for SHA-256 ee9b9bc0f963a10d…

MALICIOUS

RTF

23.3 KB First seen: 2022-11-23
MD5: 2c568a0469240235e8cf0ef7979ad06c SHA-1: 34cfa76b4c6023ddb1c607813436789b78543ff9 SHA-256: ee9b9bc0f963a10dfb20e8ab725c250f6e26d6888f476853beca56537b50035e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The RTF document contains embedded OLE object data and specifically triggers heuristics related to CVE-2017-11882, indicating an attempt to exploit a known vulnerability in the Equation Editor component. The document also contains a lure instructing the user to 'Enable editing', a common tactic to bypass security measures and facilitate the execution of malicious code.

Heuristics 6

  • Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED
    RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
  • 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_off00004671.bin
5eb84ae5aebb8db6696a63ba1e433fd034742ab7e6254bae1477c912802c691b		 rtf-objdata-decoded RTF \objdata at offset 0x4671 1288 bytes

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