Malicious RTF — malware analysis report

Static analysis result for SHA-256 af09d473655b25e8…

MALICIOUS

RTF

8.7 KB Authoring application: Riched20 10.0.16299 First seen: 2018-09-04
MD5: 39b63976490390bc6f51e94bb0857244 SHA-1: 337284c12d7b8aa4ad568c63c556212559725ff1 SHA-256: af09d473655b25e828090af0f9ffd2a4ac6fb90a666d586b53f274379944ea69
202 Risk Score

Malware Insights

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

The RTF file contains an OLE object that is automatically linked and updated, exploiting CVE-2017-0199 to fetch a remote document from 'http://dagobah.local/logo.doc'. The document body suggests this is part of a spear-phishing campaign, presenting a password-protected archive lure ('suspicious_.rar') with a given password and hash, likely to bypass gateway security.

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.
  • 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.
  • 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
  • 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 https://github.com/rapid7/metasploit-framework/blob/master/data/exploits/cve-2017-0199.rtf In RTF body
    • http://dagobah.local/logo.docIn RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000094f.bin rtf-objdata-decoded RTF \objdata at offset 0x94F 2601 bytes
SHA-256: c324398c9695a751d3f56c7b7e63760b09eeff8a2196d4f46efd537f2977f117

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