Malicious RTF — malware analysis report

Static analysis result for SHA-256 d77e09b48a198dfc…

MALICIOUS

RTF

5.6 KB First seen: 2019-05-31
MD5: ba77e20a1e16980c1bfc45af675aa070 SHA-1: bddea8f640a4a26c17a361f3945e9052ef0d1dcd SHA-256: d77e09b48a198dfc67213ecd08b3d6d4342d4dd7629032ff278ba405d7a53cc5
222 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains OLE object data and is configured to automatically update and activate an embedded OLE object. This functionality is leveraged to exploit CVE-2017-0199, which is used to download and execute a secondary payload from the IP address 111.144.45.12. The ClamAV detection confirms the exploit and its associated malware signature.

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://111.144.45.12 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: c4760afa92d54e8297885e79204fcf0de331acf77fc92f7f5a85d26acb0b9c50

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