Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 7b64b4aa057f902a…

MALICIOUS

RTF / .DOC

1.69 MB Created: 2019-09-17 13:59:00
MD5: 32894a13044a61cbc9474bd7236f13b0 SHA-1: b78f6bb2d54f3403f72b1b9eee702275e96b7100 SHA-256: 7b64b4aa057f902af8c36bf408df91697df9b1fad8a6ae36f89b221f380a1b51
302 Risk Score

Malware Insights

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

The RTF document contains critical heuristics indicating exploitation of CVE-2017-11882 and CVE-2017-8759 via Equation Editor and MSXML SAX respectively. These vulnerabilities are known to allow for arbitrary code execution when exploited. The presence of OLE object data and updates further supports the exploitation vector.

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_off00193de5.bin
cf85ed3e5d39803c754df4d25888382516e6467a83a1e85480ba1fc0466d9c7a		 rtf-objdata-decoded RTF \objdata at offset 0x193DE5 3732 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.