Malicious RTF — malware analysis report

Static analysis result for SHA-256 0d00ac1fc9f629c5…

MALICIOUS

RTF

464.7 KB First seen: 2019-03-10
MD5: cea8e7e1d5c9c333ecb33ddd211173db SHA-1: 1b181823caccd0cc2ae1b128b1c4b34ef2b293f1 SHA-256: 0d00ac1fc9f629c573ece88fdd7e36ec3cfe70d63efb43fd419eec58596bcea3
280 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of malicious activity, including OLE object data and composite moniker usage, strongly suggesting exploitation of CVE-2017-8570. This vulnerability is known to facilitate the dropping of script files, which in turn execute a payload. The presence of a PE header within hex data further confirms the embedded executable.

Heuristics 6

  • 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.
  • ClamAV: Rtf.Dropper.Agent-9965975-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-9965975-1
  • PE header (with DOS stub) in hex data critical RTF_MZ_HEX
    Hex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
  • \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 6 \objdata section(s) — embedded OLE objects

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000002f.bin rtf-objdata-decoded RTF \objdata at offset 0x2F 873 bytes
SHA-256: c481ae32e55cd5aed2c08c2e2d44fffd4c3c894b98dd0aadef7fe1bcc1714b99
objdata_01_off00018d62.bin rtf-objdata-decoded RTF \objdata at offset 0x18D62 4290 bytes
SHA-256: 62bc4770163eeee82b5a46aebd692acb1095de3e77160ff8936a9bdde6305799
objdata_02_off0001af1e.bin rtf-objdata-decoded RTF \objdata at offset 0x1AF1E 487 bytes
SHA-256: fbdc08917d7c4e786f601c1fc37cd61fc0fa1fdd4c6590c37bf66bf37ded9f73
objdata_03_off0001b328.bin rtf-objdata-decoded RTF \objdata at offset 0x1B328 833 bytes
SHA-256: a57103bc84a2998af640e20eec949b44c7cbeb12765e1e7ce6b5161436b0b531
objdata_04_off0001ba1b.bin rtf-objdata-decoded RTF \objdata at offset 0x1BA1B 2633 bytes
SHA-256: 1feb5f150bb35566d1a01fc59a357dc0ea34bc7498e0ec99bd939f6f848044b0
objdata_05_off0001cefb.bin rtf-objdata-decoded RTF \objdata at offset 0x1CEFB 178686 bytes
SHA-256: f925e2164f948548b31da2be9c19c9f0cd3c188970fcaf3e73826544afe3a1d1
embedded_rtf_0001cfb8.exe embedded-pe RTF hex-encoded MZ at offset 0x1CFB8 178592 bytes
SHA-256: 0825043d01dfd2db27fd476634705a2933bdb91ac217fc610384087766a3a47d

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