Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 14813f2f1c5a3dc1…

MALICIOUS

RTF / .DOC

327.9 KB
MD5: 8878f2a3a7a71b648afca597c3d907c6 SHA-1: 74c7a8657d80f0d4471010df9a24228e9b9fbbe8 SHA-256: 14813f2f1c5a3dc1eb83a867d1a1537c38061af136c0d54e8ec0707f103b29e6
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 contains a lure instructing the user to 'enable editing' to view the content, a common tactic for macro-enabled malicious documents. The presence of OLE object data and composite monikers strongly suggests an attempt to execute embedded code, likely a second-stage 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 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
fe2d63f545c7e7640031a8bdb54295fbba3ff1c6075793840592e8f593ea03ea		 rtf-objdata-decoded RTF \objdata at offset 0x965 56437 bytes
objdata_01_off00007114.bin
5fdce7e20144c9864fbd4b0af9cf720ac2c5b7a3f3553f2f09163faf141ece9f		 rtf-objdata-decoded RTF \objdata at offset 0x7114 56410 bytes
objdata_02_off00023c09.bin
a8e170497da15decc11753d202c99c86f7a7ffd2d52481e6b9c79a5403675379		 rtf-objdata-decoded RTF \objdata at offset 0x23C09 2632 bytes
objdata_03_off000251ac.bin
e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7		 rtf-objdata-decoded RTF \objdata at offset 0x251AC 12297 bytes

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