Malicious RTF — malware analysis report

Static analysis result for SHA-256 cc2ae8e628ab4a46…

MALICIOUS

RTF

7.6 KB First seen: 2019-11-20
MD5: ae4e1cf7cf268fbd141c0206e12278c2 SHA-1: c39f7c3bc0f9f32aedfb37797324dcd9bb1d8fdc SHA-256: cc2ae8e628ab4a463056c45cfa132a1c10815afd64256b2c60aec4bd670e9353
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 within the Equation Editor. This exploit allows for arbitrary code execution on the victim's machine, likely to download and run 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_off00000108.bin rtf-objdata-decoded RTF \objdata at offset 0x108 3644 bytes
SHA-256: 18d3df511b2a3246bfc4c05a5c7ae3fc6187a3e020fdafbcbd4d91f69565845f

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