Malicious RTF — malware analysis report

Static analysis result for SHA-256 93a4b4bca016c192…

MALICIOUS

RTF

228.8 KB
MD5: 42471712549add7a26e8957f402aa966 SHA-1: 20440a90bae34992f976dc09a0a757adde9a1882 SHA-256: 93a4b4bca016c1925bd2a499416f04d9cf4a1654a97cff707ea8957aee89619b
220 Risk Score

Malware Insights

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

The RTF file contains multiple heuristics indicating the exploitation of CVE-2017-8570, which is known to drop a script file. The presence of OLE object data and composite monikers strongly suggests that the file is designed to execute arbitrary code. The document body content appears to be malformed or corrupted, providing no clear user-facing lure.

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.
  • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000007da.bin
f2870094ba9e292da7d1702287fca7862aac00f912500f4cc776553e9a8db4f0		 rtf-objdata-decoded RTF \objdata at offset 0x7DA 20579 bytes
objdata_01_off0000afaf.bin
1af484323aa51f0bc067b498458ed2106db428c7b743185ac9a6e18e7b648e31		 rtf-objdata-decoded RTF \objdata at offset 0xAFAF 2632 bytes
objdata_02_off0000c552.bin
44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037		 rtf-objdata-decoded RTF \objdata at offset 0xC552 12297 bytes

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