RTF / .DOC malware analysis — malicious · b0ece36cf980b50f

MALICIOUS

RTF / .DOC

337.0 KB First seen: 2022-09-19

MD5: ab62c48940233f9567469ce36701416e SHA-1: 8b80b5fa226f20f615c791444e49a174a1b7b30f SHA-256: b0ece36cf980b50fd70dd8628f55caa44fdfb5b6861cdf6070db76f6651660ee

220 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 User Execution: Malicious File T1559.001 Component Object Model Hijacking T1140 Deobfuscate/Decode Files or Information

The RTF document contains OLE object data and triggers an ".objupdate" to activate it, exploiting CVE-2017-8570 via a composite moniker. The document body contains a lure instructing the user to 'Enable Editing', which is a common technique to bypass macro security. The exploit is designed to drop and execute a script, likely leading to further malicious activity.

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_off00000ba6.bin` `581d293c3a53758c49dd737b6571f0765628be0dbff060bd638edf304d0a32d9`	rtf-objdata-decoded	RTF \objdata at offset 0xBA6	74041 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off000265d8.bin` `43dc420203828d24ec36adf809a9ada54bc1f182c6dd7bd39e852b7059bf1a1d`	rtf-objdata-decoded	RTF \objdata at offset 0x265D8	2632 bytes
`objdata_02_off00027b7b.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0x27B7B	12297 bytes

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