Malicious RTF — malware analysis report

Static analysis result for SHA-256 589999aaa2213218…

MALICIOUS

RTF

51.5 KB First seen: 2023-09-07
MD5: b719fd07b3c6631dcc61bff0e8588489 SHA-1: bbc89688f4cb22a298e44b903d8b1831a127eaf1 SHA-256: 589999aaa2213218a961ade7f48566476d8e78720a8e6051ed3d0bd1fa761e4a
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The file is an RTF document that leverages the Equation Editor vulnerability, indicated by the RTF_EQUATION_EDITOR and RTF_OBJDATA heuristics. The SE_ENABLE_LURE heuristic confirms the document contains text designed to trick the user into enabling editing and potentially macros. This combination strongly suggests the document is a dropper intended to exploit the Equation Editor vulnerability to execute a secondary payload.

Heuristics 4

  • 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
  • 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_off00003e5e.bin
f95fd648c9afe760fc9c8db4b882d6424d7034475ffbe3162a050fbb2faf7f79		 rtf-objdata-decoded RTF \objdata at offset 0x3E5E 1557 bytes

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