RTF / .DOC malware analysis — malicious · 3b17bf8fc1cd239e

MALICIOUS

RTF / .DOC

232.9 KB First seen: 2022-06-16

MD5: a757077f64d653c8ecf84a86dbd196dc SHA-1: 2346d0d2a6148b7e0a46f10ab500cf6cc12a6422 SHA-256: 3b17bf8fc1cd239eb7ddccc35244f8f538ce494027a668624c139f5b546d53d0

220 Risk Score

Malware Insights

MITRE ATT&CK

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

The RTF document contains embedded OLE objects and triggers activation via \objupdate, indicating an attempt to execute embedded content. The critical CVE-2017-8570 heuristic confirms the exploitation of a vulnerability that drops an SCT script. The document body explicitly instructs the user to 'download the document and click Enable Editing', serving as a lure to bypass macro security. The extracted artifacts are likely components of this exploit chain.

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` `f20f7a0eef579f9847853ae6f6147d299f11ed649c4f0244fef2996a4d83d1ec`	rtf-objdata-decoded	RTF \objdata at offset 0x95D	23108 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000c5bb.bin` `acfe22ea9e4ff240389575cbfc30c4442fd35fc5f8c4bda2b30eb5c2cf4c1cf0`	rtf-objdata-decoded	RTF \objdata at offset 0xC5BB	2632 bytes
`objdata_02_off0000db5e.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xDB5E	12297 bytes

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