Malicious RTF — malware analysis report

Static analysis result for SHA-256 6fc2bf3b3c4c6697…

MALICIOUS

RTF

8.9 KB First seen: 2019-08-04
MD5: c192a2e231b2c46d8cc9011a834b7029 SHA-1: 8c16610c0fb7e44a8d4bbd40c95f8bb9cfb8717f SHA-256: 6fc2bf3b3c4c66977c2a707113c34b30e24e58a4908aab3602105d4b33ad62b5
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object that leverages 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. The presence of ".objupdate" further suggests an attempt to force OLE object activation.

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_off00000150.bin rtf-objdata-decoded RTF \objdata at offset 0x150 4163 bytes
SHA-256: c609262c908e309253a280eab0602e50a9e2618e125cfa580b89cf657b2a8924

Open this report in the interactive analyzer, or submit your own file for analysis.