Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 11f158ef9540360a…

MALICIOUS

RTF / .DOC

1.18 MB Created: 2019-09-17 13:59:00
MD5: af130de7bb8729a5d6c6ddc7d2b3da0b SHA-1: c871920ba067b2a334028776b9affbfd1ebd8c1e SHA-256: 11f158ef9540360aa6a8bb557cffe0bb33a0165f7d9048549f4962f9cc1380b9
342 Risk Score

Malware Insights

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

The sample is an RTF document that leverages two critical vulnerabilities, CVE-2017-11882 and CVE-2017-8759, both related to the Equation Editor component. These exploits are known to allow for arbitrary code execution, indicating the document's primary purpose is to compromise the user's system. The presence of OLE object data and the ".objupdate" directive further support the exploitation of embedded objects for malicious purposes. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic of instructing users to disable password protection on archives, likely to bypass security scans.

Heuristics 9

  • 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.
  • 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_off001153f9.bin
caa7c9d078918e2f3fcd49fe1e61c005fb73a8fa7aff4af4ab0cddc82fe28b62		 rtf-objdata-decoded RTF \objdata at offset 0x1153F9 3732 bytes

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