Malicious RTF — malware analysis report

Static analysis result for SHA-256 800615c0abac4626…

MALICIOUS

RTF

1.06 MB Created: 2017-03-27 20:21:00 First seen: 2018-07-14
MD5: 96f4b48bd496795cef9bd9ef1c55bed1 SHA-1: f92d00d7723cea20c36b1771f16550c199946557 SHA-256: 800615c0abac4626dc531d7b14c7360d776453ed9ad47caa7c2e138e2c1594f5
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_off000f5bba.bin rtf-objdata-decoded RTF \objdata at offset 0xF5BBA 11410 bytes
SHA-256: 28f7adb198bad18b5a249a3540e4891b284d6b3c2b3ad6a2e5b10b474ac824c2
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered command string(s): mshta.exe

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