Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 64b7fef25635c423…

MALICIOUS

RTF / .DOC

375.9 KB
MD5: 8aaa0c2003bddf31afc4385d1439f0a5 SHA-1: d7ea6f7e6d33a7abf5a85ed7b97d6e5501356031 SHA-256: 64b7fef25635c423b045493e9e5bde293931ce20ea7de4b4601308a7306e995f
240 Risk Score

Malware Insights

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

The RTF document contains multiple OLE objects and triggers heuristics related to composite monikers and CVE-2017-8570. This indicates the file is designed to exploit this vulnerability, which is known to drop and execute script files. The presence of a lure to 'Enable Editing' further supports its role as a malicious dropper.

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 4 \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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000bac.bin
3219f47a28483bd37a6cb933cbda1c958d01797f33388632d08272e764c089e9		 rtf-objdata-decoded RTF \objdata at offset 0xBAC 79788 bytes
objdata_01_off0000735b.bin
9b269d166dab60a8bc8a380a012b428c7ec096b5aa4e03d6e38c807f1654a111		 rtf-objdata-decoded RTF \objdata at offset 0x735B 79761 bytes
objdata_02_off0002fc0a.bin
a8e170497da15decc11753d202c99c86f7a7ffd2d52481e6b9c79a5403675379		 rtf-objdata-decoded RTF \objdata at offset 0x2FC0A 2632 bytes
objdata_03_off000311ad.bin
e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7		 rtf-objdata-decoded RTF \objdata at offset 0x311AD 12297 bytes

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