Rtf.Dropper.Agent-6993089-0 — RTF malware analysis

Static analysis result for SHA-256 354b81e69039e29c…

MALICIOUS

RTF

4.6 KB First seen: 2019-05-31
MD5: 7b21684355bf5cffa2911a6cca98bb48 SHA-1: 9623845e2c2557bd7a3ad2573d364fd4ae01de0d SHA-256: 354b81e69039e29c42d44cacbae837d1e84316abcc9c74db9488f46320bc37d4
222 Risk Score

Malware Insights

Rtf.Dropper.Agent-6993089-0 · confidence 95%

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 or CVE-2017-8759. This mechanism is designed to download and execute a second-stage payload from a remote source, as indicated by the OLE2Link remote moniker loader heuristic. The ClamAV detection name further supports its classification as a dropper.

Heuristics 6

  • CVE-2017-0199 / CVE-2017-8759 (OLE2Link auto-activated remote loader) critical CVE related RTF_OLE2LINK_REMOTE_MONIKER_LOADER
    RTF embeds an OLE2Link object that is force-activated with \objupdate (no user interaction on open) and fetches a remote second stage — through an INCLUDETEXT/INCLUDEPICTURE field or the OLE object's own moniker. This is the OLE2Link auto-update attack path shared by CVE-2017-0199 (server returns an HTA/scriptlet) and CVE-2017-8759 (server returns a SOAP WSDL the .NET parser compiles). Office processes the fetched response through the same code path; the specific CVE depends on the now-unreachable server content type.
  • ClamAV: Rtf.Dropper.Agent-6993089-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-6993089-0
  • 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://schemas.microsoft.com/office/word/2003/wordml In 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 2091 bytes
SHA-256: d3200c9d5371fa421b40ab817fd3337f0cc9e98d6bb22b8f8803ea4dd8f58513

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