Malicious RTF — malware analysis report

Static analysis result for SHA-256 9bd906fb7e5dc2ed…

MALICIOUS

RTF

44.4 KB Created: 2017-11-15 13:08:00 First seen: 2017-11-20
MD5: de37a607e1572920d7e6c80628e875ce SHA-1: b838a8df7383673a2f9ebb8cac753c9984e382e9 SHA-256: 9bd906fb7e5dc2edcaca5a8b3ca7c33987ba5684293393eec15cd46f41ac169e
142 Risk Score

Malware Insights

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

The RTF document 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/aus.doc to download a secondary payload. The document also contains a lure instructing the user to enable editing, which is a common tactic for malware droppers.

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/aus.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_off0000337f.bin rtf-objdata-decoded RTF \objdata at offset 0x337F 3640 bytes
SHA-256: 8c020063aee63317c88b656367c74587f1ab1871f617f765260a74c87a93a9b9

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