Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 659d217a6b8ab390…

MALICIOUS

RTF / .DOC

375.3 KB
MD5: 883d2b2aa8c0e37fcec05384d2ca04f4 SHA-1: d85007a5f8a9a30d8831e83361a29267cdc10609 SHA-256: 659d217a6b8ab390a9c0d70e0a4f12e05d945cba399246623e42675acac7e11c
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, including composite monikers and automatic updates, strongly suggesting exploitation of CVE-2017-8570. The document body explicitly instructs the user to 'Enable Editing' and implies the need to open the document to view its content, which is a typical social engineering lure to bypass macro security. This combination points to a dropper mechanism designed to execute a malicious script, likely a SCT file as indicated by the CVE.

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_off00000965.bin
ac8f1871cc86d9d6dc058c6091b8b832a641ab8895feab1519ac4a52898c915f		 rtf-objdata-decoded RTF \objdata at offset 0x965 79784 bytes
objdata_01_off00007114.bin
3e7c5530879349cc7d1b054835b5af8780cbcf4aea107c43e3ac551314db0ae2		 rtf-objdata-decoded RTF \objdata at offset 0x7114 79757 bytes
objdata_02_off0002f9bb.bin
a8e170497da15decc11753d202c99c86f7a7ffd2d52481e6b9c79a5403675379		 rtf-objdata-decoded RTF \objdata at offset 0x2F9BB 2632 bytes
objdata_03_off00030f5e.bin
e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7		 rtf-objdata-decoded RTF \objdata at offset 0x30F5E 12297 bytes

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