RTF / .DOC malware analysis — malicious · 85081a4a92b0e56e

MALICIOUS

RTF / .DOC

218.1 KB

MD5: 9398c35b581b843246ab743afac209d1 SHA-1: 7d29612252aa0926139d9b4cf6ccf55a43fc51b3 SHA-256: 85081a4a92b0e56e1b17b842d74ed6c86cd873548b5070369691520464d8f932

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF document contains OLE objects and uses ".objupdate" to force activation, indicating an attempt to execute embedded content. Heuristics confirm the exploitation of CVE-2017-8570, which is known to drop SCT scripts. The document body contains a lure instructing the user to 'Enable Editing', a common tactic for macro-based malware.

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.
\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
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
Suspicious extracted artifact medium 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000ba2.bin` `b097f6d5374631bbd5165c4493a5e2fccf721939b3ca31d99a0e8629ca2fbb8d`	rtf-objdata-decoded	RTF \objdata at offset 0xBA2	15540 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00008a80.bin` `893d8db8585190a273d0c7c3dcff2eb58184b866a3687a9319ca72a8284876cb`	rtf-objdata-decoded	RTF \objdata at offset 0x8A80	2632 bytes
`objdata_02_off0000a023.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0xA023	12297 bytes

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