Gandcrab — RTF malware analysis

Static analysis result for SHA-256 9f4241f7bdb66400…

MALICIOUS

RTF

420.9 KB First seen: 2019-10-01
MD5: 2b044643d52fbfa91802bcaa52bb66ef SHA-1: ba151678f4afd7b9a27619dcca87789a569980ea SHA-256: 9f4241f7bdb66400ff7f872eba79936894d621229b85a1a66d3dafd372e69bb3
342 Risk Score

Malware Insights

Gandcrab · confidence 95%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains OLE object data and triggers critical heuristics for CVE-2017-8570, indicating it exploits this vulnerability to drop a script. ClamAV detections identify the sample as Win.Dropper.Gandcrab-7077551-0, suggesting a ransomware or information-stealing payload. The embedded PE header further confirms the presence of an executable artifact.

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.
  • ClamAV: Win.Dropper.Gandcrab-7077551-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Dropper.Gandcrab-7077551-0
  • 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
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://nsis.sf.net/NSIS_Error In RTF body

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00003af4.bin rtf-objdata-decoded RTF \objdata at offset 0x3AF4 885 bytes
SHA-256: eeabec211f2ccdc2d7c9de123e145457e6ea1837722e08b7b8d755219cd5056e
objdata_01_off00004211.bin rtf-objdata-decoded RTF \objdata at offset 0x4211 612 bytes
SHA-256: c62851521e10316dfd43f2b6ee67cc27e2a24456bb346c8fa9dc4a6d6e21d526
objdata_02_off0000470b.bin rtf-objdata-decoded RTF \objdata at offset 0x470B 482 bytes
SHA-256: 8f35162cb7523f92e9f44d62d12eded23d00d10857cb163693e107bc76bbe0d8
objdata_03_off00004b03.bin rtf-objdata-decoded RTF \objdata at offset 0x4B03 870 bytes
SHA-256: 32061a4dca89ef49c09f05d649d9d25dda979cbf0f2da90d4c3523ad7b48cca2
objdata_04_off00005236.bin rtf-objdata-decoded RTF \objdata at offset 0x5236 2633 bytes
SHA-256: fe11c27d916ab897eb94064e9631d8a29c847a6db39259bef31578da8d19fdf5
objdata_05_off00006710.bin rtf-objdata-decoded RTF \objdata at offset 0x6710 202281 bytes
SHA-256: 58e310d29140b3bcfb203628f4576aab26dba9fb87fb2520a2f6b4723caeef43
Detection
ClamAV: Win.Dropper.Gandcrab-7077551-0
Obfuscation or payload: unlikely

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