Malicious RTF — malware analysis report

Static analysis result for SHA-256 dd7cec01b2d4df94…

MALICIOUS

RTF

1.14 MB Created: 2017-04-13 15:10:00 First seen: 2019-08-04
MD5: 54528fab9b7880adfca2b4c3755e8dd7 SHA-1: 5fb521a1ea06a7c9cb68b3d98535e17fbd63d8a4 SHA-256: dd7cec01b2d4df941de36f07f4be0dab9377a8a5fa7069df5a843750d12106c6
362 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.001 PowerShell

This RTF document exploits CVE-2017-8759, a vulnerability in MSXML SAX OLE activation, to achieve code execution. It contains references to PowerShell and Windows Script Host, and includes embedded OLE objects, suggesting it's designed to download and execute a second-stage payload. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely attempts to trick the user into opening a password-protected archive, a common tactic for bypassing gateway security.

Heuristics 10

  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • ClamAV: Win.Phishing.Suspicious-6355521-4 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Phishing.Suspicious-6355521-4
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Package object class high RTF_OBJCLASS_PACKAGE
    OLE Package object — can wrap arbitrary files
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • OLE object data medium RTF_OBJDATA
    RTF contains 2 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.microsoft In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00109046.bin rtf-objdata-decoded RTF \objdata at offset 0x109046 11422 bytes
SHA-256: 3724cf461589b966c7cfdcb1d1af36c435594634afba38a02e06e0d85478e3c4
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered command string(s): mshta.exe

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