Malicious RTF — malware analysis report

Static analysis result for SHA-256 4caaf8ab19b7bce8…

MALICIOUS

RTF

8.4 KB First seen: 2019-06-27
MD5: d468bfa5a3020d9f55d66e205e6fbea8 SHA-1: ec200e3ac9301065a6a171965c1fd75a5fefd208 SHA-256: 4caaf8ab19b7bce866bb1e86aeab475e7d23e3ea5c57c1bb60993082a6935370
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object that exploits the CVE-2017-11882 vulnerability in Equation Editor. This vulnerability allows for arbitrary code execution when the object is activated, likely leading to the download and execution of a secondary payload.

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_off000000d5.bin rtf-objdata-decoded RTF \objdata at offset 0xD5 4160 bytes
SHA-256: e5c1d6978f2171d209678dd6654b1f253b1eee5ae3883262bd5b8215a3ab55b0

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