Malicious RTF — malware analysis report

Static analysis result for SHA-256 a0f48c689677f2ee…

MALICIOUS

RTF

5.6 KB First seen: 2019-08-04
MD5: cdc141d97d150a3359ef23eefd6bdebd SHA-1: 7bed0ff34cb13a0eb52566b480e5550d3666e8c7 SHA-256: a0f48c689677f2eef0538652a9c53582c716a468bb0a674e859e87c3bb2154d4
222 Risk Score

Malware Insights

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

The RTF file contains an OLE object that is automatically linked and updated, indicating an attempt to activate remote content. The critical CVE-2017-0199 heuristic firing confirms exploitation of this vulnerability, targeting the embedded URL http://192.168.178.157:8080//. This suggests the file is designed to download and execute a secondary payload from the specified address.

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://192.168.178.157:8080// In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000000df.bin rtf-objdata-decoded RTF \objdata at offset 0xDF 2724 bytes
SHA-256: 9e950f687df0f38523846401335373236af0fdf30e81b57acfc407244c7c9a7f

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