Malicious RTF — malware analysis report

Static analysis result for SHA-256 34e83e49e9b7bf08…

MALICIOUS

RTF

44.6 KB Created: 2017-11-20 14:39:00 First seen: 2017-11-29
MD5: a325b49ce63a8f84e18e1d7b06042041 SHA-1: bc9215e1d6af3f343c4937a853b71abba2e9c2be SHA-256: 34e83e49e9b7bf08fec9d600cd2787e198b64346d7ce16c6e8b2b8e5b30e719b
142 Risk Score

Malware Insights

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

The RTF document exploits CVE-2017-0199 via a remote URL moniker, targeting the vulnerability to download and execute a secondary payload from http://185.24.233.241/3/aaus.doc. The presence of an OLE object and a lure to 'ENABLE EDITING' further indicate a malicious intent to bypass security controls and execute arbitrary code.

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/aaus.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_off00003461.bin rtf-objdata-decoded RTF \objdata at offset 0x3461 3640 bytes
SHA-256: 8be465af514e7aeae9b0f434f1a3e89138881d2ddd66e177191b0de7c2c89b00

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