Malicious RTF — malware analysis report

Static analysis result for SHA-256 4458b680f781358d…

MALICIOUS

RTF

1.33 MB Created: 2017-05-03 22:12:00 First seen: 2019-09-30
MD5: 1f5022a02c82fbe414dc91bf3f1b5180 SHA-1: 64661d09307849912b220866d479790acfa86ea1 SHA-256: 4458b680f781358da2ab47e1cc43e5a4eb17e5d70825cf1c92a543b353d791b3
362 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document that exploits CVE-2017-8759, a critical vulnerability in MSXML SAX OLE activation, to execute arbitrary code. It also contains references to PowerShell and Windows Script Host, suggesting further malicious activity. The presence of OLE object data and a 'Password-protected archive handoff' heuristic indicates the document is likely a lure to trick users into opening a password-protected archive, possibly containing a phishing form or further malware.

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.com/office/word/2003/wordml In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0013bb74.bin rtf-objdata-decoded RTF \objdata at offset 0x13BB74 11426 bytes
SHA-256: 3e57352f45a302ffc276439c3046d60740d8b31126f8b323d2230e2dd66041d7
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered command string(s): mshta.exe

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