Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 068573bab85f54a7…

MALICIOUS

RTF / .DOC

2.54 MB Created: 2019-09-17 13:59:00
MD5: fbfc4c0aa8f0a69044b28a2329c00023 SHA-1: 7af4e94f6bf82f1907cfbbcaed07d21f65fc2c57 SHA-256: 068573bab85f54a79e73a96aa5e3fed2ffbe2b1d5d51b234f399854990a79d10
302 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document that contains embedded OLE objects, specifically targeting Equation Editor vulnerabilities. Critical heuristics indicate exploitation of CVE-2017-11882 and CVE-2017-8759, which are known to allow for arbitrary code execution when activated. The document body is heavily obfuscated and does not provide clear textual lures, but the presence of these exploits strongly suggests an attempt to compromise the user's system upon opening.

Heuristics 8

  • Equation Editor Ole10Native payload — CVE-2017-11882 likely critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE
    RTF decodes to an activated Microsoft Equation 3.0 OLE storage whose payload is a high-entropy Ole10Native stream rather than normal Equation Native/MTEF data. This is a weaponized Equation Editor RCE delivery shape consistent with CVE-2017-11882/CVE-2018-0802.
  • 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 — 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_off0026d0f0.bin
1d002108557163a1adc46486090f50319382875a098c30f7ed878ae0bf86e5dd		 rtf-objdata-decoded RTF \objdata at offset 0x26D0F0 3732 bytes

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