Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 cfac37cd5b85ab3f…

MALICIOUS

RTF / .DOC

664.8 KB Created: 2019-09-17 13:59:00
MD5: 0e16b8368adbd8eeba8c851b7f10a6fd SHA-1: 0c8fecb44fcdc1c9ed35b388d789cf7e32ba7bcb SHA-256: cfac37cd5b85ab3f8f719a5362e13664f3a511819c9c687de196e67f8b2617f7
200 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.001 PowerShell

The sample is an RTF document that leverages the Equation Editor vulnerability (CVE-2017-8759). The presence of OLE object data and the specific CLSID for Equation Editor strongly indicate exploitation. The embedded URL, while benign, is part of the document structure that facilitates the exploit. The primary attack vector is exploitation for client execution, leading to potential arbitrary code execution.

Heuristics 6

  • 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.
  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • \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://schemas.microsoft.com/office/word/2003/wordml

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000a1b22.bin
fdb06468f4cd9370cea3c76acb40bf039cc73096b63b1985c2146664f37b46c2		 rtf-objdata-decoded RTF \objdata at offset 0xA1B22 3739 bytes

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