Malicious RTF — malware analysis report

Static analysis result for SHA-256 7c9e6f21f25c10bb…

MALICIOUS

RTF

9.2 KB First seen: 2019-02-10
MD5: 19ccd1e0f0a222f554c14b1f129e6889 SHA-1: 1e0b3000e49534391816fa96b555d5800755e72c SHA-256: 7c9e6f21f25c10bb4ed8e7f4461639b931e3f38a302a87b03dc22c820338b640
200 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains embedded OLE object data and specifically triggers the Equation Editor CLSID, indicating exploitation of CVE-2017-11882. This vulnerability allows for arbitrary code execution when the embedded object is activated. The ClamAV detection further confirms the presence of this exploit.

Heuristics 5

  • 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
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000003b.bin rtf-objdata-decoded RTF \objdata at offset 0x3B 4663 bytes
SHA-256: 95b15fdceb85d04ddefcc9b3cdb9adb97ccaa73b3d5ba75800a7f335f87a4ea4

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