RTF / .DOC malware analysis — malicious · 1cab97d73c3f92f4

MALICIOUS

RTF / .DOC

233.0 KB First seen: 2022-06-21

MD5: b028dae964d51eb9e7f76c9879cf5300 SHA-1: 84e5d6406e52e3ad3666b871a0b0741fa64b891c SHA-256: 1cab97d73c3f92f4d080ad9d8f5c2ccb3889a10ab6ca5e23ff90de5a91b70eeb

220 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.005 Visual Basic

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 'click Enable Editing when opening' to bypass security warnings. This indicates a malicious intent to execute embedded code, likely a downloader or dropper, disguised as a functional document. No scripts were directly extracted, but the heuristics strongly suggest script execution via OLE object manipulation.

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` `5993cb03032cb59d2722b2559b7a35a90183d839bdcf998f495998e11ed5678c`	rtf-objdata-decoded	RTF \objdata at offset 0x95D	23124 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000c5dd.bin` `4aa0e7f5ab53bb62fd4a60818892a21fcbe35dba260d2112984f00988c699ebb`	rtf-objdata-decoded	RTF \objdata at offset 0xC5DD	2632 bytes
`objdata_02_off0000db80.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xDB80	12297 bytes

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