Malicious RTF — malware analysis report

Static analysis result for SHA-256 59142faa6799ce90…

MALICIOUS

RTF

8.1 KB First seen: 2019-01-20
MD5: 287e0b78aa461aaa40177d0c7d5b9da2 SHA-1: a1df26f366bfb0ba39e0da3e434bb76dd1b3024d SHA-256: 59142faa6799ce908de832a82a947d0d9599cb8da8fe16ad0a5efdf936e07800
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 Microsoft Equation Editor and OLE object activation. ClamAV detection confirms this is a known exploit for CVE-2017-11882, which allows for arbitrary code execution. The file's purpose is to exploit this vulnerability.

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_off0000003a.bin rtf-objdata-decoded RTF \objdata at offset 0x3A 4131 bytes
SHA-256: 82d616c0447aab1924ed032fed9fbfb6c9d7c5cf49090e6901ca77a9c43a933f

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