Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 5e663cf9243b9a2e…

MALICIOUS

RTF / .DOC

229.3 KB
MD5: 9c4ed8fd9de8cf77979e73cf7c750a16 SHA-1: ca4f063193809a85a34948c1e9116f65ef039a6b SHA-256: 5e663cf9243b9a2e5757311c4b6c70c241b766646df6774b629f499d0e72c5ff
240 Risk Score

Malware Insights

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

The RTF document contains multiple indicators of malicious OLE object embedding, specifically related to CVE-2017-8570 which is known to drop SCT scripts. The document body explicitly instructs the user to 'Enable Editing' and implies the need to enable macros, a common lure for executing malicious content. The presence of composite monikers and objdata sections strongly suggests the exploitation of this vulnerability to execute a secondary payload.

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_off00000965.bin
a2bc34666fd860c541b161b4811a6b3bfa2a606e364d005cf51db829985049c2		 rtf-objdata-decoded RTF \objdata at offset 0x965 20622 bytes
objdata_01_off0000b194.bin
18cff8ef194415d33763880bf64011d23305e4b9143b76244b89e1c53b70a0d5		 rtf-objdata-decoded RTF \objdata at offset 0xB194 2632 bytes
objdata_02_off0000c737.bin
44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037		 rtf-objdata-decoded RTF \objdata at offset 0xC737 12297 bytes

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