Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 1c65c5481a10849b…

MALICIOUS

RTF / .DOC

32.7 KB First seen: 2023-04-14
MD5: 610151c8e1d588bc114f5790b4f8deda SHA-1: 3a1c723d0e46fdb4d82bbac921a52a7c9a3df5fe SHA-256: 1c65c5481a10849b56fac836adceaba28f7c6ea3358fb37a691f6c0972c2fd71
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The RTF document contains OLE object data and specifically triggers heuristics related to Equation Editor vulnerabilities and automatic OLE activation. The document body includes a lure instructing the user to 'Enable editing', indicating a social engineering tactic to bypass security measures. The presence of these indicators suggests the file is designed to exploit a vulnerability, likely via the Equation Editor, to execute malicious code upon user interaction.

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.
  • 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_off00005457.bin
582430d2f5860dcffbbc19f04925265d362ceef0b84cdcda7f89330f3da57bfe
rtf-objdata-decoded RTF \objdata at offset 0x5457 1386 bytes