Malicious RTF — malware analysis report

Static analysis result for SHA-256 54256045e4d66856…

MALICIOUS

RTF

8.2 KB First seen: 2019-01-20
MD5: 825dca62da2bca1fea757d0a5ec529af SHA-1: 2deb8b535c4982f52ccbe0fdbb64732134a0ef25 SHA-256: 54256045e4d66856110b83322cc4ddf96f53de25091555b65a7f77379fa78d4f
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains embedded OLE object data and specifically triggers heuristics related to the Equation Editor vulnerability (CVE-2017-11882). ClamAV also explicitly detects this exploit. This indicates the file is designed to exploit this vulnerability for client-side execution.

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_off0000003c.bin rtf-objdata-decoded RTF \objdata at offset 0x3C 4156 bytes
SHA-256: d09f4581ebc4b2abe53f220ff92bbaff4335921ff4584b8503523fc94d1e78b7

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