Malicious RTF — malware analysis report

Static analysis result for SHA-256 08a8ea44605f8141…

MALICIOUS

RTF

5.6 KB First seen: 2019-08-04
MD5: 73c80d20582c1b0634afcf76bd61a34a SHA-1: 2f5395e6959947fce5feeb013d4c6ea14b3db37a SHA-256: 08a8ea44605f814195440c1eb2af252474c87999fc95b1ebcbea4542c2ba9d29
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, exploiting CVE-2017-0199. This vulnerability is used to fetch a payload from the embedded URL http://94.130.40.133:8080/http:/icloudtn.com. The file is detected by ClamAV as Rtf.Exploit.CVE_2017_0199-6335035-0, indicating its malicious intent to execute remote code.

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://94.130.40.133:8080/http:/icloudtn.com 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_off000001b4.bin rtf-objdata-decoded RTF \objdata at offset 0x1B4 2601 bytes
SHA-256: 326b029f010ce332537b2a0b98c5f2a722ad21af5c29454d5d2e9f422e88c985

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