Malicious RTF — malware analysis report

Static analysis result for SHA-256 8fd9fc4e38a85411…

MALICIOUS

RTF

9.2 KB First seen: 2022-10-23
MD5: b82740d37d5337b2e2da1424b8d2ec8c SHA-1: e45d1cf5e47eef7734cb2e6950aff39dcf8857a9 SHA-256: 8fd9fc4e38a85411f0e13d3b3417f4405503fe0bd768ac9b715509fede12a581
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains embedded OLE object data and specifically triggers the CVE-2017-11882 vulnerability related to the Equation Editor. This exploit allows for the execution of arbitrary code, likely to download and run a secondary payload. The presence of the ".bin" file suggests a potential embedded executable or script.

Heuristics 4

  • 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.
  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • \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_off0000003a.bin
0984e203289cdfde3a18cb2f173a433ea87888e6a46479cbf0cb29494379afe5		 rtf-objdata-decoded RTF \objdata at offset 0x3A 4669 bytes

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