Malicious RTF — malware analysis report

Static analysis result for SHA-256 47f786f64da89021…

MALICIOUS

RTF

341.2 KB First seen: 2021-09-23
MD5: b30b3f24b6f2b984070f59b27379ae33 SHA-1: a4d204a53962ce14a6347d2c22b2686f79493f7b SHA-256: 47f786f64da89021d67ecb57d4e24cf446be48f06e5c74700591dae69fb90a1c
240 Risk Score

Malware Insights

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

The RTF file 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 'Enable Editing', a common lure to bypass macro security. The presence of composite monikers and objupdate directives strongly suggests an attempt to execute embedded code.

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 rtf-objdata-decoded RTF \objdata at offset 0x969 75724 bytes
SHA-256: b65323a1ff9ecb6fa7be15f20fbf23d036c766956f615d4d1a615be945bff5c6
objdata_01_off0002714c.bin rtf-objdata-decoded RTF \objdata at offset 0x2714C 2632 bytes
SHA-256: f4c761490fd63fc4aa791746a9a2b588dafd9e2c764f57f0c85377b99ef07062
objdata_02_off000286ef.bin rtf-objdata-decoded RTF \objdata at offset 0x286EF 12297 bytes
SHA-256: 44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037

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