RTF / .DOC malware analysis — malicious · b09eb083963bcc49

MALICIOUS

RTF / .DOC

226.5 KB First seen: 2022-09-13

MD5: 62f4e9638e2c8fcb38981873e71f08d9 SHA-1: 7744fe6a1b3762e3d6e17b52fde16a1624009dc7 SHA-256: b09eb083963bcc4927b2c86a301f840c6003c0db240239f0a290c72a0d688e27

220 Risk Score

Malware Insights

MITRE ATT&CK

T1204 User Execution T1204.002 Malicious File T1566 Phishing T1566.001 Spearphishing Attachment T1059 Command and Scripting Interpreter T1059.005 Visual Basic

The RTF document contains OLE objects and triggers ".objupdate" which is indicative of exploiting CVE-2017-8570 to drop a script. The document body explicitly instructs the user to 'click Enable Editing when opening' to bypass security measures, a common lure for macro-enabled 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_off0000095d.bin` `f9b0d6422b77a20f3bca510141382cf859db60e58631a4a13ea63df25c7c8e03`	rtf-objdata-decoded	RTF \objdata at offset 0x95D	19916 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000abcb.bin` `0d43d0259256045ade883d7b458e66a06e631ebdde9a2c08ee87abea4afef7c9`	rtf-objdata-decoded	RTF \objdata at offset 0xABCB	2632 bytes
`objdata_02_off0000c16e.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xC16E	12297 bytes

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