Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 4e9e57073c99e59d…

MALICIOUS

RTF / .DOC

8.8 KB
MD5: 6e6520638e17a1fca2f4d93dba56581b SHA-1: 68adb192d58686b54feefe30dba247dbf8aeee27 SHA-256: 4e9e57073c99e59d096167b9b0f3cf2a4d62d8de420055e7c364abeb6104128e
280 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an RTF document that contains embedded OLE object data. Critical heuristics indicate the presence of the Equation Editor CLSID and a specific vulnerability, CVE-2017-11882, which is triggered by a FONT record overflow within the decoded RTF object. This exploit is known to allow for arbitrary code execution. The file is detected by ClamAV as Rtf.Exploit.CVE_2018_0802-6825822-0.

Heuristics 6

  • 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
  • ClamAV: Rtf.Exploit.CVE_2018_0802-6825822-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2018_0802-6825822-0
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000092.bin
d27b070f7f63e6471c05164411eeaa50debf8c74bf92fc5589698b0afb9d6b10		 rtf-objdata-decoded RTF \objdata at offset 0x92 4175 bytes

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