Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 00d51477a424136e…

MALICIOUS

RTF / .DOC

582.9 KB Created: 2019-09-17 13:59:00
MD5: 1918467ba41cb6ed440c1da2f6195d29 SHA-1: 920aa30356aa0651e25f5a76df948e29f9658b1e SHA-256: 00d51477a424136e07e6cba10d3740c012cbeb3e5405f99a2a42e2bef5a4cb1d
302 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an RTF document containing embedded OLE objects, specifically targeting vulnerabilities in the Equation Editor (CVE-2017-11882) and MSXML (CVE-2017-8759). These exploits are known to allow for arbitrary code execution, likely to download and run a secondary payload. No document body text or scripts were extracted, but the critical heuristic firings strongly indicate exploitation of these known vulnerabilities.

Heuristics 8

  • Equation Editor Ole10Native payload — CVE-2017-11882 likely critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE
    RTF decodes to an activated Microsoft Equation 3.0 OLE storage whose payload is a high-entropy Ole10Native stream rather than normal Equation Native/MTEF data. This is a weaponized Equation Editor RCE delivery shape consistent with CVE-2017-11882/CVE-2018-0802.
  • 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.
  • Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM
    RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
  • 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_off0008d0cf.bin
4be23094363a2565a0a0aaa12e558e88bedc17a8d87e432ed47ce40dd587f3ed		 rtf-objdata-decoded RTF \objdata at offset 0x8D0CF 3739 bytes

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