Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 b808c4ee5e9fdb51…

MALICIOUS

RTF / .DOC

1.69 MB Created: 2019-09-17 13:59:00
MD5: 999e79ac396cfeac9a6fe8138cd7cd03 SHA-1: 9ad0690e7986a111798f294b37383d99989eaf99 SHA-256: b808c4ee5e9fdb51e08ffe0ee885c09f6b6e7eb034322bcd9116fb6fa8c083cb
242 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1059 Command and Scripting Interpreter T1059.003 Command and Scripting Interpreter: Windows Command Shell

The sample is an RTF document containing an embedded OLE object that leverages the Equation Editor. Critical heuristics indicate exploitation of CVE-2017-8759, a known vulnerability associated with the Equation Editor, which allows for arbitrary code execution. The embedded OLE object is likely designed to download and execute a secondary payload.

Heuristics 7

  • 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 — context-specific rules above attribute URLs they actually evaluated; this rule lists URLs that were present in the bytes but were not otherwise tied to a specific finding.
    URL http://schemas.microsoft.com/office/word/2003/wordml

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00198657.bin
686caf4f77b782bd5f99be3e0dceced72620fa027038ab36daeee3afe4eb8ef9		 rtf-objdata-decoded RTF \objdata at offset 0x198657 3739 bytes

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