RTF / .DOC malware analysis — malicious · 428a2118926a69b7

MALICIOUS

RTF / .DOC

336.0 KB First seen: 2022-09-15

MD5: 2214a5fd8b21dc68b3a3755e0da8b1cd SHA-1: 03c99ce772fdde9759b598a118e88562a03082e0 SHA-256: 428a2118926a69b70ede2453f8f95fbdc1c78dfcc3671a703448862ddd097bbc

220 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1059.005 Command and Scripting Interpreter: Visual Basic T1566.001 Phishing: Spearphishing Attachment T1566 Phishing

The RTF document contains multiple OLE object data sections and triggers heuristics related to CVE-2017-8570, indicating it exploits a vulnerability to drop a script. The document body explicitly instructs the user to 'download the document and click Enable Editing when opening,' a common lure to bypass macro security. The embedded artifacts, particularly objdata_01_off000261c5.bin, are likely the dropped script that executes the malicious payload.

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_off0000095f.bin` `a075b2948ca03f61fdb266eedf70f262ac3d6b850f9749c3538003bfcdfb2336`	rtf-objdata-decoded	RTF \objdata at offset 0x95F	73819 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off000261c5.bin` `43dc420203828d24ec36adf809a9ada54bc1f182c6dd7bd39e852b7059bf1a1d`	rtf-objdata-decoded	RTF \objdata at offset 0x261C5	2632 bytes
`objdata_02_off00027768.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0x27768	12297 bytes

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