Malicious RTF — malware analysis report

Static analysis result for SHA-256 a002d8904a7ddf4f…

MALICIOUS

RTF

28.1 KB First seen: 2022-11-25
MD5: 1d5bfac95dd1ebc0a522b31774f3eef1 SHA-1: 6e9d3e26edb0b51d49b6397b3ea2ccb57bb74951 SHA-256: a002d8904a7ddf4f6f1b1a8e6e90a83205fbb5436f3633f1857af79c5e2540f5
220 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1059.005 PowerShell

The RTF document contains embedded OLE object data and specifically triggers heuristics related to Microsoft Equation Editor and CVE-2017-11882. The document body includes a lure instructing the user to 'Enable editing', which is a common tactic to bypass macro security and activate embedded exploits. The presence of the Equation Editor ProgID 'eQuatION.3' strongly suggests an attempt to exploit this known vulnerability.

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_off00005737.bin
f6489761acf83dd8765b0844089a9faad0039c23a21ca6545997dd878bff3f32		 rtf-objdata-decoded RTF \objdata at offset 0x5737 1822 bytes

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