Malicious RTF — malware analysis report

Static analysis result for SHA-256 38eb646582c3c84a…

MALICIOUS

RTF

8.3 KB First seen: 2019-09-30
MD5: da5315e2cb050dde71e807b472316529 SHA-1: f25043d1355a28081e714860ab4c8af2e9a1cc91 SHA-256: 38eb646582c3c84a761eceaa9d518ce6e1a31ab31beeb73b3ec22032710d3707
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 the Equation Editor vulnerability (CVE-2017-11882). This indicates the file is designed to exploit this known flaw to achieve arbitrary code execution on the victim's system. No document body text or scripts were extracted, but the presence of the exploit is sufficient evidence.

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_off00000033.bin rtf-objdata-decoded RTF \objdata at offset 0x33 4148 bytes
SHA-256: bb2324c4d52038710bfb5fd0496a4316946308c0355f47f554dcd8ce34f3c233

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