Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 c166a7f931452e48…

MALICIOUS

RTF / .DOC

470.5 KB Created: 2021-10-26 05:44:00
MD5: 8c7fae181de7b6daac8d6cbaf328d6d0 SHA-1: c4ef978cb35b40a2e8a9f54f8e8e5d1199918950 SHA-256: c166a7f931452e486cfe99f960ad3585d0afb98140402044931d92af0c89a4a4
222 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1566.001 Spearphishing Attachment T1059.001 PowerShell

The RTF file contains multiple indicators of malicious OLE object embedding and activation, specifically triggering the CVE-2017-8759 vulnerability. This vulnerability allows for the execution of arbitrary code when the OLE object is activated. The presence of `RTF_OBJAUTLINK` and `RTF_OBJUPDATE` further suggests an attempt to automatically activate and update the embedded object, likely to trigger the exploit. No document body text or scripts were extracted, but the heuristics strongly indicate a classic exploit delivery mechanism.

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.
  • Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED
    RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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 3 \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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000c828.bin
cb3c2565255f1c27b238b7e66fb41b59b34d58daf5c2d1ed777364643f4abb58		 rtf-objdata-decoded RTF \objdata at offset 0xC828 116592 bytes
objdata_01_off00047c17.bin
79fc97ccaa38d91458cde2c6b1b01259c64ac0c6d61e1a01b0a66bc01e3e6a8d		 rtf-objdata-decoded RTF \objdata at offset 0x47C17 2632 bytes
objdata_02_off000491ba.bin
44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037		 rtf-objdata-decoded RTF \objdata at offset 0x491BA 12297 bytes

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