Malicious RTF — malware analysis report

Static analysis result for SHA-256 d7529400b167ebfa…

MALICIOUS

RTF

8.1 KB First seen: 2018-12-09
MD5: 58ae95b05055d2b8c8fdce44e592298f SHA-1: 5f2643d28cd2f45ca023f6ec4ddffa28746b4f7b SHA-256: d7529400b167ebfa51f1e1fbf550eab7ae8f2e877c357266e279f3e575f81ea3
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains embedded OLE object data and triggers heuristics indicating the exploitation of the Equation Editor vulnerability (CVE-2017-11882). This vulnerability allows for arbitrary code execution on the victim's machine. The ClamAV detection further confirms the malicious nature of the file, specifically identifying it as a document exploit.

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 4139 bytes
SHA-256: 10af74feb8d4c7246cb46157d8e6f973f1fdda3bcf8f1875323849252584eced

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