Malicious RTF — malware analysis report

Static analysis result for SHA-256 4a5fd8a88d250a70…

MALICIOUS

RTF

41.4 KB Created: 2017-12-08 14:58:00 First seen: 2017-12-24
MD5: f9c008d2a3e4e2a3b658d1692d85dec0 SHA-1: d85705559f1a5178781b4ebc9a727048ede30fee SHA-256: 4a5fd8a88d250a70f22b5c7ddfc2c0aa1b58e98d9256ead3018880b115630bd9
122 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains an OLE object with an automatically linked URL, identified as exploiting CVE-2017-0199. This exploit is designed to download and execute a payload from the specified URL. The embedded URL, https://klotshop.tech/common/matus/volt.hta, is highly suspicious and likely serves as the second-stage payload.

Heuristics 4

  • CVE-2017-0199 (OLE2Link / weaponized URL) critical CVE exact CVE_2017_0199_WEAPONIZED_URL
    RTF contains a URL Moniker OLE link to a script/HTA/template-style remote loader, matching the tighter static CVE-2017-0199 shape.
  • 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
  • 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://klotshop.tech/common/matus/volt.hta 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_off0000277d.bin rtf-objdata-decoded RTF \objdata at offset 0x277D 3640 bytes
SHA-256: cddfda37ea27a711a94aca0ac3a6ad4f30b59ac4fe5f06afccad39bedc824031

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