Malicious RTF — malware analysis report

Static analysis result for SHA-256 189f0ab021c39b7e…

MALICIOUS

RTF

6.6 KB First seen: 2023-01-07
MD5: 5036c5caf4d3839c4768b846b2026b49 SHA-1: 05971e6e13b6a5e88ec50ae43fe89874516e88e6 SHA-256: 189f0ab021c39b7e837691b536c320ff30d20de3c27c938176ce3f0cc317987a
200 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 PowerShell

The RTF document contains an embedded OLE object specifically identified as an Equation Editor object, triggering heuristics related to CVE-2017-11882. The presence of ` tf1 ouicompat onttbl 0 decor swiss charset0 0 Arial;{\* chars04310441043B043804390430043D043E043204300442044C00200434043E043A0443043C0435043D0442002C003A0068043004330430043A04380439

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.
  • \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
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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_off00000bdb.bin
4880e57fbe098edf0e27ef681a741cf86a598a11f7afdb4c1ff03c97338a093e		 rtf-objdata-decoded RTF \objdata at offset 0xBDB 1811 bytes

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