Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 5d6515052058ca58…

MALICIOUS

RTF / .DOC

286.2 KB First seen: 2022-03-01
MD5: f95701ce9d006b05f5b1d453b5e13bc3 SHA-1: 93395e80f752225ae9391347825d7aa48af16af8 SHA-256: 5d6515052058ca580fa2280e02c2c2fc29fd37235b7f09f3159974aeab966b2b
180 Risk Score

Malware Insights

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

The RTF document contains OLE objects and triggers the CVE-2017-8570 vulnerability via a composite moniker. This vulnerability is known to drop and execute a script, likely for further malicious activity. The document body contains only formatting information, providing no direct clues to the lure.

Heuristics 5

  • 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.
  • \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_off000007d0.bin
10a6b16f134e745a77700e2b0734314cd9c19e1c4785c5f6670ebd005f90f025		 rtf-objdata-decoded RTF \objdata at offset 0x7D0 49507 bytes
objdata_01_off00019aac.bin
ea39900f3f35bed9f78c8f6402daf7e23b4f89a2f7c10ee6f3ec6918b4c4be7e		 rtf-objdata-decoded RTF \objdata at offset 0x19AAC 2632 bytes
objdata_02_off0001b04f.bin
44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037		 rtf-objdata-decoded RTF \objdata at offset 0x1B04F 12297 bytes

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