Malicious RTF — malware analysis report

Static analysis result for SHA-256 2132d3e0053f7667…

MALICIOUS

RTF

439.5 KB Created: 2018-03-25 18:15:00 First seen: 2018-06-14
MD5: 8b0289db61484a274744b0008b38e115 SHA-1: d6f60d24fdda339a6514d3b1ce900e62fd102dac SHA-256: 2132d3e0053f7667a4ac99db08e0ea5d8fdb07534d40945698eb4e9f68c4197e
202 Risk Score

Malware Insights

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

The RTF file contains embedded OLE objects and triggers critical heuristics for CVE-2017-11882 (Equation Editor) and CVE-2017-8759 (MSXML SAX OLE activation). These vulnerabilities are commonly exploited to execute arbitrary code. The embedded URL 'http://garvit.xyz/arodcrypted.msi' suggests the file's purpose is to download and execute a malicious MSI installer, likely acting as a downloader for a second-stage payload.

Heuristics 6

  • CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882
    Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • \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
  • 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://garvit.xyz/arodcrypted.msi 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_off0000b334.bin rtf-objdata-decoded RTF \objdata at offset 0xB334 15672 bytes
SHA-256: 130f6730327ea534fa55f9cc38b46e9431db021ee4ac64b1c8f6de85480ea0c0

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