Malicious RTF — malware analysis report

Static analysis result for SHA-256 5b0bb064be0d32c6…

MALICIOUS

RTF

44.4 KB Created: 2017-11-14 05:25:00 First seen: 2017-11-20
MD5: 0d9efa59bae34726cc7a1d0fd11ae13d SHA-1: 334d0ceb0cc99151e7cfa0a9d9e35a385919103b SHA-256: 5b0bb064be0d32c674905532f20675464c58aa65be2c7314c817be7c66c24779
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://185.24.233.19/2/j1.doc, which likely serves as a downloader for a secondary malicious payload. The document also contains a lure to enable editing, indicating a common social engineering tactic.

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://185.24.233.19/2/j1.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_off00003380.bin rtf-objdata-decoded RTF \objdata at offset 0x3380 3640 bytes
SHA-256: adde0e05aac9815b723dbba3e19d37f64416b800f01216ffd4f43c6f1167f9b5

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