Malicious RTF — malware analysis report

Static analysis result for SHA-256 26b63c2e819485bc…

MALICIOUS

RTF

8.3 KB First seen: 2019-11-20
MD5: 1b875612927bf2f30c9fbc61d6c1b666 SHA-1: 354e328a919287f0cc32596f18fda3dd88e00261 SHA-256: 26b63c2e819485bc5f366c5130e8fcacf8b528c3f83701eabcfbe76bafaa4937
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). This exploit allows for arbitrary code execution upon opening the document. The ClamAV detection explicitly names this vulnerability, confirming the exploitation method.

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
  • ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.CVE_2017_11882-6934206-0
  • \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_off00000033.bin rtf-objdata-decoded RTF \objdata at offset 0x33 4146 bytes
SHA-256: 965dd286a2f5cc2bca1a544d7ff4b14535a3b3ce85fd41b3d5c2ec2462ab15ec

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