Malicious RTF — malware analysis report

Static analysis result for SHA-256 6acdfaa7968f0f92…

MALICIOUS

RTF

44.4 KB Created: 2017-11-20 09:58:00 First seen: 2017-11-29
MD5: b58f0dee1ddd7fa19f25901b8718e5f7 SHA-1: 296ec206ea9f8732ddebe4885bfe89a20cb69beb SHA-256: 6acdfaa7968f0f927028ededa21a43f0f9552e8f6c63fd78cbb45985dcdb8052
142 Risk Score

Malware Insights

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

The RTF file contains an OLE object that exploits CVE-2017-0199, a known vulnerability for remote code execution. The exploit targets the URL http://185.24.233.241/3/aap2.doc to download a secondary payload. The document also contains a lure to enable editing, indicating a malicious intent to bypass security measures.

Heuristics 5

  • 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.
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://185.24.233.241/3/aap2.doc In 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_off00003381.bin rtf-objdata-decoded RTF \objdata at offset 0x3381 3640 bytes
SHA-256: c8e1aa5e22c705d43fd95b782f4704102857b6b71c88c1bf38d4b59f4527a0f4