Malicious RTF — malware analysis report

Static analysis result for SHA-256 b329c2fc46be3e41…

MALICIOUS

RTF

7.2 KB First seen: 2019-03-18
MD5: 0ab7e13fe7e63c3e1d028c4c0cee60fa SHA-1: e90ea0b79bce7f74c71368286ca132f2362126aa SHA-256: b329c2fc46be3e4132592d6aedda577f540f7a8bb31897d74705e9bd0bcb9a46
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 vulnerability to achieve code execution on the victim's system. No document body or script content was available for further analysis.

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 3641 bytes
SHA-256: 3d8ef09cdf476caa3e30646150af6cda47f5497a928cc85402a1ce8d2e592afd

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