Malicious RTF — malware analysis report

Static analysis result for SHA-256 de9b4a27f4efd5fd…

MALICIOUS

RTF

426.1 KB First seen: 2018-11-05
MD5: 5d79a969eb1775af5dcb9ca307240e48 SHA-1: eeea59bb9bcb1fb9e4ed1513404dc142455f034f SHA-256: de9b4a27f4efd5fdcfcf3ef7f0a2c6a4dbb2fd2ed7d67433ba32b858051244b9
162 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains OLE object data and is weaponized to exploit CVE-2017-0199. This exploit is used to automatically link and update an OLE object, which forces the download and execution of a HTA file from the URL https://a.doko.moe/kmapsz.hta. The document body is heavily obfuscated and does not provide further context on the payload's intent.

Heuristics 5

  • 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.
  • \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 https://a.doko.moe/kmapsz.hta In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00057277.bin rtf-objdata-decoded RTF \objdata at offset 0x57277 23391 bytes
SHA-256: fb2334ead104635ed10c741f2a278530e9502368887f64d7ac1cb228aff5f180

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