RTF / .DOC malware analysis — malicious · 03be0184e1182d36

MALICIOUS

RTF / .DOC

238.1 KB First seen: 2022-11-09

MD5: 12bc2d9ae65f063620f0c9e4eee6ef3e SHA-1: cde997a4fad4284463ea18a16141c732d6312fd0 SHA-256: 03be0184e1182d36bee282b7ff70b12d5e2909077d671cc13743f1d5735f81d9

220 Risk Score

Malware Insights

MITRE ATT&CK

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

The RTF document contains OLE object data and triggers heuristics related to CVE-2017-8570, indicating it drops an SCT script. The document body explicitly instructs the user to 'download the document and click Enable Editing', a common lure to bypass macro security. The embedded script, though truncated, appears to be Base64 encoded and likely downloads a second-stage 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` `5e41b7fecf006a14460adcca8b20365b7fc27de923de997930b7fa782f4e2196`	rtf-objdata-decoded	RTF \objdata at offset 0x95F	25638 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000da4b.bin` `a8067f2f56086529114ca9573b5fb18bafa4bc65f99c3187b2d852749c9861bb`	rtf-objdata-decoded	RTF \objdata at offset 0xDA4B	2632 bytes
`objdata_02_off0000efee.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xEFEE	12297 bytes

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