RTF / .DOC malware analysis — malicious · f26e6511b62b5177

MALICIOUS

RTF / .DOC

233.0 KB First seen: 2022-06-24

MD5: 5b926c4faa8ce58606f46beaaf7519dd SHA-1: dad935fe64b1e86ce458ea5bd7a59725e92b813d SHA-256: f26e6511b62b517757fa069530221db6d6fa5a49b17072adecdb5ad9e5110a30

220 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1559.001 Component Object Model Hijacking T1059.005 Visual Basic

The RTF document contains embedded OLE objects and utilizes a composite moniker, strongly indicating exploitation of CVE-2017-8570. The document body explicitly instructs the user to 'download the document and click Enable Editing', a common lure to bypass macro security. The embedded OLE object data, specifically objdata_01_off0000c5cb.bin, is associated with the CVE-2017-8570 exploit, which typically drops a script file.

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` `7dfcaef3558d81fd31e8834af9ff6077f1fc61ba73c7dfb93ba4e33d33004cc8`	rtf-objdata-decoded	RTF \objdata at offset 0x95D	23116 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000c5cb.bin` `625ba87dad062d63542a2f08013c93a4f9eac2363a88c9240f1688e698b82c02`	rtf-objdata-decoded	RTF \objdata at offset 0xC5CB	2632 bytes
`objdata_02_off0000db6e.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xDB6E	12297 bytes

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