Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 a3262df8796f39ee…

MALICIOUS

RTF / .DOC

1.18 MB Created: 2019-09-17 13:59:00
MD5: 62be786dba8a113fbb2af2d11d5cfa30 SHA-1: 23dadea8b00be1eaf580b58677aa391103d932b7 SHA-256: a3262df8796f39ee9842824eb0f6b57421786f386c4ec3f5120a66e9a43c1941
200 Risk Score

Malware Insights

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

The file is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor. Critical heuristics indicate the presence of CVE-2017-8759, a known vulnerability that allows for arbitrary code execution when the embedded object is activated. This suggests the document is designed to exploit this vulnerability to deliver a malicious payload.

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_off001280d4.bin
3ed235b983c78d094abe8c4bd15f85776a7449dc0e1606034d07ab2fceb1ba92		 rtf-objdata-decoded RTF \objdata at offset 0x1280D4 3739 bytes

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