Malicious RTF — malware analysis report

Static analysis result for SHA-256 cb32f0f4befba2ac…

MALICIOUS

RTF

9.2 KB First seen: 2018-10-07
MD5: 8f7f30c0eabc09196a7e0fbde46d5f06 SHA-1: 3befe78ea26fc63d6e0765967e529fcebfda0052 SHA-256: cb32f0f4befba2aca5b6facb0a7022fa1716ca2873095fd52a1f59367bd621ed
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 Equation Editor exploits. ClamAV detection confirms this is a known exploit targeting CVE-2017-11882, which allows for arbitrary code execution. The file's primary purpose is to leverage 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 4665 bytes
SHA-256: 21fbf9cca032fbda462b09b5082bc3cff9277869c8414142a37b2bcecc66d07b

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