Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 156ef0c1cf12455b…

MALICIOUS

RTF / .DOC

422.2 KB
MD5: 78c18f8780fd53cf125503ec2f0b13f4 SHA-1: aa081b35215e17bc31727d300f1a7fb9a3a5a091 SHA-256: 156ef0c1cf12455baaea10a67353e2d4a560cc93a891e108204ce44657078dda
240 Risk Score

Malware Insights

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

The RTF document contains OLE objects and triggers heuristics related to CVE-2017-8570, indicating it likely drops a script for execution. The document body explicitly prompts the user to 'Enable Editing', a common social engineering tactic to bypass security measures and execute malicious content. The embedded OLE object data suggests the exploitation of a vulnerability to achieve code execution.

Heuristics 7

  • Composite Moniker — CVE-2017-8570 (drops SCT script) critical CVE related CVE_2017_8570
    RTF \objdata decodes to OLE data containing the Composite Moniker — CVE-2017-8570 (drops SCT script) CLSID — the vulnerable control/moniker is embedded directly in the document's object stream, the delivery shape of this exploit. RTF objects auto-render when Word opens the file.
  • 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000969.bin
e8d706816b92a6a6e3fd14b8142dcfee4f632da435c0454f2a9686470848d56b		 rtf-objdata-decoded RTF \objdata at offset 0x969 116297 bytes
objdata_01_off0003baf4.bin
76d4b8abb802bd06807a33ff09524d55e3d2a62fcd03f4b22006247f71e3f743		 rtf-objdata-decoded RTF \objdata at offset 0x3BAF4 2632 bytes
objdata_02_off0003d097.bin
44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037		 rtf-objdata-decoded RTF \objdata at offset 0x3D097 12297 bytes

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