Malicious RTF — malware analysis report

Static analysis result for SHA-256 fc60ab0558df71df…

MALICIOUS

RTF

9.3 KB First seen: 2019-11-20
MD5: c0df783ef2fa0069ebbf5afc4b720d83 SHA-1: a232dba46c58c4c9631939721af856c854abed0d SHA-256: fc60ab0558df71df85e4b093a38abbddb6b7a446d8a4c5e317c21880354ec5a7
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains embedded OLE object data and specifically triggers heuristics for CVE-2017-11882, indicating exploitation of the Equation Editor vulnerability. This vulnerability allows for arbitrary code execution on the victim's machine.

Heuristics 4

  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882
    Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
  • \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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000032.bin rtf-objdata-decoded RTF \objdata at offset 0x32 4652 bytes
SHA-256: dd8a38bcd1b0a4b2de67ce524a1db545bf9cdf66695dd5add282fc32f965d2f1

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