Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 382fb69bb165085b…

MALICIOUS

RTF / .DOC

2.71 MB Created: 2019-09-17 13:59:00
MD5: ce640333276704f9a973153ada77cd5d SHA-1: 4c42f88645e0d3717a67ad1b00bf1600004f2349 SHA-256: 382fb69bb165085b5cd3931c85dd7e006d04ae792b37721d6ff9f6cbb9b6734b
240 Risk Score

Malware Insights

MITRE ATT&CK
T1204.001 Malicious Link/Object T1059.001 PowerShell

The sample is an RTF document containing an embedded OLE object, specifically targeting the Equation Editor with CVE-2017-8759. This indicates an attempt to exploit a known vulnerability for code execution. The presence of ".objupdate" suggests the embedded object is designed to be activated automatically, likely to download and execute a secondary payload. The document body is heavily obfuscated, preventing a clear understanding of its lure, but the technical indicators strongly suggest a malicious exploit delivery.

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.
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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_off00299532.bin
b5fc80de1d308d48c2021afcab5aa0dfebe00cdfb3b82eb77f37db728fd07768		 rtf-objdata-decoded RTF \objdata at offset 0x299532 3732 bytes

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