Malicious RTF — malware analysis report

Static analysis result for SHA-256 b4d5f8c95e894c75…

MALICIOUS

RTF

5.6 KB First seen: 2017-11-20
MD5: b15d16907ecc52c0ebc9b86201303174 SHA-1: b31f7271a526d47de8bfead9d117372cac5d4f78 SHA-256: b4d5f8c95e894c7592075ac1f3cb40afbeed6a9c284f8c7c9641f13ec7ae1162
222 Risk Score

Malware Insights

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

The RTF file contains OLE object data and is configured to automatically update, indicating an attempt to exploit vulnerabilities. Specifically, the CVE-2017-0199 heuristic fired, pointing to the embedded URL http://GreatMike.crabdance.com:162/logo.doc. This exploit is known to download and execute a secondary payload, likely leading to further compromise.

Heuristics 6

  • CVE-2017-0199 (OLE2Link / remote URL Moniker) critical CVE likely CVE_2017_0199
    RTF contains a URL Moniker OLE link whose decoded target is remote. Office can fetch and process the response through the CVE-2017-0199 OLE2Link attack path, but the server-side content type is not proven statically.
  • ClamAV: Rtf.Exploit.CVE_2017_0199-6335035-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_0199-6335035-0
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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 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
    • http://GreatMike.crabdance.com:162/logo.docIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000001a2.bin rtf-objdata-decoded RTF \objdata at offset 0x1A2 2601 bytes
SHA-256: 6cf3afa1e395270f1f19250e2c55ae25c2ec7691e577c96b30c50c0ef07bcd42

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