Gandcrab — RTF malware analysis

Static analysis result for SHA-256 328b29b940554b49…

MALICIOUS

RTF

734.6 KB First seen: 2020-02-04
MD5: 6d36c15327846d69d6c0687a6275613e SHA-1: a4be38a5f4c266c132d7cf132d6064036b2fc6aa SHA-256: 328b29b940554b497693b7dc4b1f74dc58dceb0619a33ed4aeeafa09b95af290
424 Risk Score

Malware Insights

Gandcrab · confidence 95%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of exploitation for CVE-2017-8570, including composite moniker and Equation Editor CLSID firings. ClamAV detections identify the sample as Win.Dropper.Gandcrab-7077551-0, suggesting it acts as a dropper for the Gandcrab ransomware family. The embedded OLE object data likely contains the malicious payload.

Heuristics 10

  • 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.
  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • 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 7 \objdata section(s) — embedded OLE objects
  • OlePres presentation stream in RTF OLE object medium RTF_OLEPRES_STREAM
    RTF contains an embedded OLE object with an OlePres presentation stream. OlePres is an OLE presentation marker and is not enough on its own to identify CVE-2025-21298.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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_off00000031.bin rtf-objdata-decoded RTF \objdata at offset 0x31 336798 bytes
SHA-256: 4a1cddbff2de124fcca03140bc22c2a8d0926f472ca2ec440f6ae9588aed4389
Detection
ClamAV: Win.Dropper.Gandcrab-7077551-0
Obfuscation or payload: likely
Carved artifact entropy is 7.95, consistent with packed or encrypted content.
objdata_01_off000ad7ed.bin rtf-objdata-decoded RTF \objdata at offset 0xAD7ED 11417 bytes
SHA-256: 5d6cfe4c5d1aa428e7c0f5e3f03a769703c8abf56b2cd296a4c4e881ac0011e7
objdata_02_off000b3157.bin rtf-objdata-decoded RTF \objdata at offset 0xB3157 381 bytes
SHA-256: 3458e1d85410d8b0a08c68591e0912e582782375d61f43343a9a5d6983b8c436
objdata_03_off000b348d.bin rtf-objdata-decoded RTF \objdata at offset 0xB348D 788 bytes
SHA-256: 9f474d871d5073e0821f436fc51680b1a4730c0843652540921f90acc5b5f4a5
objdata_04_off000b3b33.bin rtf-objdata-decoded RTF \objdata at offset 0xB3B33 2633 bytes
SHA-256: 1feb5f150bb35566d1a01fc59a357dc0ea34bc7498e0ec99bd939f6f848044b0
objdata_05_off000b505b.bin rtf-objdata-decoded RTF \objdata at offset 0xB505B 4679 bytes
SHA-256: 82391dd064c94b96ac16e2f26524d4d6c5630381aa5a88c7c3d5e8aac77bbfc4

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