Malicious RTF — malware analysis report

Static analysis result for SHA-256 897e0f14ac9db1a5…

MALICIOUS

RTF

610.7 KB Created: 2019-09-19 23:26:00 First seen: 2020-05-25
MD5: f2bfbd056e2f84ab636d658cb66a822c SHA-1: 543a4faae821e3082aca494be83aec7e5c083fe4 SHA-256: 897e0f14ac9db1a541643dcab94cf0abe8a3d6f76e2ebf377fed7ee16ce74028
162 Risk Score

Malware Insights

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

The RTF document contains an embedded OLE object that is activated via \objupdate, exploiting CVE-2017-8759. This technique is commonly used to download and execute a second-stage payload. The presence of a reference to Windows Script Host further suggests the execution of external code.

Heuristics 5

  • 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.
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • \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 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://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002f19.bin rtf-objdata-decoded RTF \objdata at offset 0x2F19 89382 bytes
SHA-256: 2157516f9602fc2c560440eb0ef01ea7e2e004b3fd3835d42da65382defb7ac8

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