Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 0174f2ae73de2c65…

MALICIOUS

RTF / .DOC

920.1 KB Created: 2019-09-17 13:59:00
MD5: 6aad32d47dc65501a1ff04847f2217c5 SHA-1: 5b77e900f12c5ecb8500f32363d60b8fbbe6dbbb SHA-256: 0174f2ae73de2c6555b520a69b0cc9cb910620252f699854c682bc188ffac4c9
302 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The sample is an RTF document containing embedded OLE objects, specifically triggering critical heuristics for Equation Editor and MSXML vulnerabilities (CVE-2017-11882 and CVE-2017-8759). These vulnerabilities allow for the execution of arbitrary code when the document is opened. The presence of ` tf1 ouicompat ouidom tf2` and the `Ole10Native` stream further confirm the exploitation of these known vulnerabilities.

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_off000e0855.bin
bfd7ceeffab1d93296c4c3e58f54f517d63b778ac5588ebd47334fcb979d5a42		 rtf-objdata-decoded RTF \objdata at offset 0xE0855 3739 bytes

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