Malicious RTF — malware analysis report

Static analysis result for SHA-256 fe2e5d0543b4c876…

MALICIOUS

RTF

6.1 KB Created: 2002-06-14 10:24:00 First seen: 2018-03-04
MD5: 415fe69bf32634ca98fa07633f4118e1 SHA-1: 101cc1cb56c407d5b9149f2c3b8523350d23ba84 SHA-256: fe2e5d0543b4c8769e401ec216d78a5a3547dfd426fd47e097df04a5f7d6d206
222 Risk Score

Malware Insights

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

The RTF file contains an OLE2Link object that is automatically activated via \objupdate, exploiting CVE-2017-0199 or CVE-2017-8759. This mechanism is designed to download and execute a second-stage payload from a remote source embedded within the OLE moniker stream. The document also contains a lure instructing the user to 'Enable Editing', a common tactic for malware droppers.

Heuristics 7

  • 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.Exploit.CVE_2017_0199-6331394-6 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_0199-6331394-6
  • \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 OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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_off000002e0.bin rtf-objdata-decoded RTF \objdata at offset 0x2E0 2593 bytes
SHA-256: df1d5d4124cc8a7024064f57f77eb64347455641d91084bfe72434c8cea4fa93

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