Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 729f20408786691d…

MALICIOUS

RTF / .DOC

241.5 KB
MD5: 81b22f7b7ee081fa82adddf2cd61a0d1 SHA-1: aa2f1ee24b812f886278e5a16a9e599bb3ff3c72 SHA-256: 729f20408786691df49a0dbc47efd36783b1ffe71ac94dbb6811512979f8fafe
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic 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 'click Enable Editing when opening', indicating a lure to bypass security measures. This suggests the file is a dropper designed to execute a malicious script via OLE object exploitation.

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
1b7c0053ed71691a370748a658d913c174553d7c45569a7a8fbcc0bd0c16cb89		 rtf-objdata-decoded RTF \objdata at offset 0x969 26658 bytes
objdata_01_off0000e2a2.bin
9d9bc825f2fa5e0ed8db7dce6823e199ad9c775873472d42887214589f205470		 rtf-objdata-decoded RTF \objdata at offset 0xE2A2 2632 bytes
objdata_02_off0000f845.bin
44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037		 rtf-objdata-decoded RTF \objdata at offset 0xF845 12297 bytes

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