Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 e3e53818ce691ec1…

MALICIOUS

RTF / .DOC

698.6 KB Created: 2019-09-17 13:59:00
MD5: 15dc5d9fd98a43b9ea77fafe035f110c SHA-1: 10edf340c57e6e7bff0ca11692693fede01f7386 SHA-256: e3e53818ce691ec1e92f29e93a51eb3e8dc2b213db7b451e61db472938cf7681
240 Risk Score

Malware Insights

MITRE ATT&CK
T1204.001 User Execution: Malicious Link T1566.001 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

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 in MSXML SAX that allows for OLE activation. The presence of ".objupdate" further suggests that the embedded object is designed to be activated automatically. The heuristic "SE_PASSWORD_ARCHIVE_LURE" indicates the document likely attempts to trick the user into opening a password-protected archive, a common tactic for bypassing gateway security. The embedded URL, while benign, is present in the document text.

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_off000a7730.bin
be82cfde49e83ab36f34ad8d2e025e9b4ebb4477c0c34f8789772b276344df8a		 rtf-objdata-decoded RTF \objdata at offset 0xA7730 3739 bytes

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