Malicious RTF — malware analysis report

Static analysis result for SHA-256 2594134643fa259a…

MALICIOUS

RTF

536.4 KB First seen: 2019-05-10
MD5: f390efef372ce6569c01078d9d0e5f83 SHA-1: 95d3a20039f6394e64a17bacf2f5ed963bc52121 SHA-256: 2594134643fa259a92df95e3d8f6c55d383e83db6ab736b47e9e5eea745baaff
242 Risk Score

Malware Insights

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

The RTF document contains multiple OLE objects and triggers the CVE-2017-8570 vulnerability via a composite moniker. This vulnerability is known to drop and execute a script, likely leading to further malicious activity. The ClamAV detection confirms the malicious nature of the file.

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: Rtf.Dropper.Agent-7534803-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-7534803-0
  • \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
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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.

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000025.bin rtf-objdata-decoded RTF \objdata at offset 0x25 229 bytes
SHA-256: bdf6de0a64b3411ca5229f989a8704bb9f2ac8eac0d3b0c83ab62136585dd012
objdata_01_off0000021e.bin rtf-objdata-decoded RTF \objdata at offset 0x21E 260906 bytes
SHA-256: ea4923b06b4aec43e08a857aff9c00ac1114e4a4780ae7cda4ed93717fab54ff
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.91, consistent with packed or encrypted content.
objdata_02_off0008337b.bin rtf-objdata-decoded RTF \objdata at offset 0x8337B 1123 bytes
SHA-256: 263c6a332f8bed14e4d9417cab11f921ef8d301d5b5d655b5a43179ea58c7434
objdata_03_off00083c7a.bin rtf-objdata-decoded RTF \objdata at offset 0x83C7A 636 bytes
SHA-256: beeb549ebc57e264e8e77fa6b4cfd820bf95bef53865f2e41c70d776aef38923
objdata_04_off000841aa.bin rtf-objdata-decoded RTF \objdata at offset 0x841AA 404 bytes
SHA-256: 392cac683130eb6402c5b549f0e7d1653f531eebb9a09e8b26c73d30cf6c8b98
objdata_05_off0008450e.bin rtf-objdata-decoded RTF \objdata at offset 0x8450E 937 bytes
SHA-256: e21955e19ee5e9c33caa29d20574aba20d6cc02b855734ac20377ad351eddf3c
objdata_06_off00084cde.bin rtf-objdata-decoded RTF \objdata at offset 0x84CDE 2633 bytes
SHA-256: ce081fd28fe7177ff803b92dfff0940839fdacbc316318ce15cbf8889540f4f0

Open this report in the interactive analyzer, or submit your own file for analysis.