Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 0781609c95d49539…

MALICIOUS

RTF / .DOC

368.4 KB
MD5: f01525b2b4ebb308ecc5d816e447f0e4 SHA-1: d943d79f881d088093bcb954c47be5f147210e92 SHA-256: 0781609c95d49539c78f3638fd03ba47f3488fc7c8c4c1b5cce3907003ad6dd6
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 manipulation, specifically related to CVE-2017-8570, which is known to drop SCT scripts. The document body explicitly instructs the user to 'download the document and click Enable Editing', a common lure to bypass security measures and enable macro execution. This suggests the file is designed to exploit vulnerabilities and 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 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
eeaa7be44d0366ace4d20613a6bbe208cdeb7971fbd3d12a1ccdb59a79e1b6c6		 rtf-objdata-decoded RTF \objdata at offset 0x965 76400 bytes
objdata_01_off00007114.bin
8d810657f6faf2237eada91539e56b4eb8df5398e5ff883d6e5fc45fd6685335		 rtf-objdata-decoded RTF \objdata at offset 0x7114 76373 bytes
objdata_02_off0002de3d.bin
a8e170497da15decc11753d202c99c86f7a7ffd2d52481e6b9c79a5403675379		 rtf-objdata-decoded RTF \objdata at offset 0x2DE3D 2632 bytes
objdata_03_off0002f3e0.bin
e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7		 rtf-objdata-decoded RTF \objdata at offset 0x2F3E0 12297 bytes

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