Malicious RTF — malware analysis report

Static analysis result for SHA-256 47c684cd58146f9a…

MALICIOUS

RTF

64.1 KB First seen: 2023-08-09
MD5: b98806523c4916585df3f414296d0905 SHA-1: c2541aa8299dd929b29c3c8d8d27b21ea97f4201 SHA-256: 47c684cd58146f9adbd71eb47df0a97b0edeb1cf4e257ac5c12583349fed4c09
160 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution: Malicious Link T1059 Command and Scripting Interpreter

The RTF file contains an embedded OLE object and specifically triggers heuristics related to Equation Editor exploitation and forcing OLE activation. The document body includes a lure instructing the user to 'Enable editing', which is a common tactic to bypass macro security settings and trigger exploits. The presence of these indicators suggests the file is designed to exploit a vulnerability, likely via the Equation Editor, to execute further malicious code.

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.
  • \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_off000027b0.bin
866c7cbe53d008a537f17363ab4a1e227a68d713f620b16e8d162d216cc528cf
rtf-objdata-decoded RTF \objdata at offset 0x27B0 1739 bytes