Malicious RTF — malware analysis report

Static analysis result for SHA-256 bfe2ed82f6fc7861…

MALICIOUS

RTF

5.6 KB First seen: 2017-12-09
MD5: a11f97cb7b64956fc34541225696e709 SHA-1: c9a46d2a9595f8f17db2982d5ed5f9d7aefc44c8 SHA-256: bfe2ed82f6fc7861831d753cff6e4d68d5e7901f2d15ace32336a0830e14dc32
222 Risk Score

Malware Insights

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

The RTF file contains an OLE object with an automatically linked and updating object, indicative of an exploit. Specifically, it leverages CVE-2017-0199 to embed a URL that points to a remote HTA file. This technique is commonly used to download and execute a second-stage payload, likely malicious.

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://192.168.1.103:8080/default.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_off000001b4.bin rtf-objdata-decoded RTF \objdata at offset 0x1B4 2601 bytes
SHA-256: 32216e103eece86e8ecdbc84f8099e9ee68dd66a4902f76738e7a223fbf07d74

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