Malicious RTF — malware analysis report

Static analysis result for SHA-256 4536ea320b766aef…

MALICIOUS

RTF

5.6 KB First seen: 2018-03-04
MD5: 4f5dde428afbd9feb112f3aa252c46fd SHA-1: de61a1ee8e90624fcb04910f657d4d17605c020a SHA-256: 4536ea320b766aefc5e93b5065874c54bfecb5ffbcde7be3cb2af779514bae69
222 Risk Score

Malware Insights

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

The RTF file contains embedded OLE object data and is flagged for exploiting CVE-2017-0199. This exploit is designed to automatically link to and download a remote object, in this case, from the URL http://192.168.37.128/logo.doc. This indicates the file's primary purpose is to act as a dropper for a secondary malicious payload.

Heuristics 6

  • 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.
  • ClamAV: Rtf.Exploit.CVE_2017_0199-6335035-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_0199-6335035-0
  • 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 http://192.168.37.128/logo.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_off000001a2.bin rtf-objdata-decoded RTF \objdata at offset 0x1A2 2601 bytes
SHA-256: e37e67f6d0de5c70a8639ac28f00dbb08da9dbde92ed95554c8afc6773f123be

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