Malicious RTF — malware analysis report

Static analysis result for SHA-256 2da4a415a896115e…

MALICIOUS

RTF

5.6 KB First seen: 2019-10-29
MD5: a1242a4193a25e221bfe4be8eca9f47b SHA-1: 278d0d88ffcb4ef3e1e63adca9ac023a968988cc SHA-256: 2da4a415a896115e88cb10eea396e38c5de01e5916bac824ee1bdb5161f1250d
222 Risk Score

Malware Insights

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

The RTF file contains an OLE object configured for automatic linking and updating, exploiting CVE-2017-0199. This mechanism is designed to fetch and execute a payload from the embedded URL http://192.168.8.108/test.hta. The presence of the OLE object and the weaponized URL strongly indicate an exploit delivery attempt, likely via spearphishing.

Heuristics 6

  • CVE-2017-0199 (OLE2Link / weaponized URL) critical CVE exact CVE_2017_0199_WEAPONIZED_URL
    RTF contains a URL Moniker OLE link to a script/HTA/template-style remote loader, matching the tighter static CVE-2017-0199 shape.
  • 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://192.168.8.108/test.hta 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: 35efa8e57925022692f1164c5c33038ece897fcafc2a7e98db6cd2907f62a47c

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