Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 3aa1e581198e086b…

MALICIOUS

RTF / .DOC

878.3 KB Created: 2019-09-17 13:59:00
MD5: d5cab6da2f86a848854c532864ddfcb0 SHA-1: eb551e18eb9c98c5ff7a8c8c912d01a747786f1e SHA-256: 3aa1e581198e086bbadcb54dd119e7fa7b92318353a89cb6433088ac8d2a160c
240 Risk Score

Malware Insights

MITRE ATT&CK
T1204.001 User Execution: Malicious Link T1566.001 Phishing: Spearphishing Attachment

The file is an RTF document that leverages the CVE-2017-8759 vulnerability in MSXML SAX OLE activation via the Equation Editor. This indicates an attempt to exploit a known vulnerability for code execution. The presence of OLE object data and the objupdate directive further support this attack vector. The document likely serves as a lure to trick the user into activating the embedded exploit, leading to the download and execution of a malicious 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.
  • 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_off000d5f53.bin
5e840ebbd67b5a78a5b9139171551a59a6b8dc66f522f939ab425cc555f626d5		 rtf-objdata-decoded RTF \objdata at offset 0xD5F53 3739 bytes

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