Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 41bfbb9ab9b21612…

MALICIOUS

RTF / .DOC

14.8 KB
MD5: 239c3776ed81667a6f5cc58dced354e6 SHA-1: 651fa74b596af9bb833070553aac294013bf02e5 SHA-256: 41bfbb9ab9b216128a82959ac490cab6b6ee4ae40801d711b80be3f7dd23a97e
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an RTF document that leverages the CVE-2017-11882 vulnerability in the Equation Editor component. This is a critical finding indicated by multiple heuristics and ClamAV detection. The exploit is designed to execute code, and while no specific payload or URL was extracted, the nature of the exploit strongly suggests a downloader or dropper functionality. The OLE object data further supports the exploitation vector.

Heuristics 4

  • 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_2017_11882-6584355-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
  • \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_off00001a3c.bin
75847472ea1435d13f36d2bd9c9f8c1ecd294a332a21739a819bd0df27c9cff5
rtf-objdata-decoded RTF \objdata at offset 0x1A3C 4167 bytes