RTF / .DOC malware analysis — malicious · 070172e62acbf8cc

MALICIOUS

RTF / .DOC

226.4 KB First seen: 2022-09-13

MD5: 304e56a3af6b4dbaaf610c8f507a298e SHA-1: eb431b4d4208004cc3d33c27d92d93abd14a1647 SHA-256: 070172e62acbf8cc34bc43a6cdf61e78826d7f77d023d600bac7682dc3f524f0

220 Risk Score

Malware Insights

MITRE ATT&CK

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

The RTF document contains embedded OLE objects and triggers CVE-2017-8570, which is known to drop SCT scripts. The document body explicitly instructs the user to download and enable editing, a common social engineering tactic to bypass macro security. The embedded artifacts are likely payloads or scripts executed via the Composite Moniker vulnerability.

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` `ced4d985da439f81db72778e4356b7bf629e216aed3691d2fc57b92cea6a66af`	rtf-objdata-decoded	RTF \objdata at offset 0x95D	19912 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000abc3.bin` `0d43d0259256045ade883d7b458e66a06e631ebdde9a2c08ee87abea4afef7c9`	rtf-objdata-decoded	RTF \objdata at offset 0xABC3	2632 bytes
`objdata_02_off0000c166.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xC166	12297 bytes

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