RTF / .DOC malware analysis — malicious · b73c7b9f24fc1b3c

MALICIOUS

RTF / .DOC

235.6 KB First seen: 2022-07-13

MD5: 8304d3e5774b6538293c79f1cee0bde2 SHA-1: 0d4fe9b3665f881e1696d4616188536f6217d2b1 SHA-256: b73c7b9f24fc1b3cdb4c059b44eb900e79f84727869739dcb00f5b157ab3931d

220 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.005 Visual Basic

The RTF document contains embedded OLE objects and triggers heuristics related to CVE-2017-8570, which is known to drop SCT scripts. The document body contains a common lure instructing the user to 'Enable Editing' to view the content. This suggests the file is designed to exploit the vulnerability to execute a script, likely for further payload deployment.

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_off00000ba4.bin` `2d58abfc1412fc0cdf341342f25f8715968ecb6dd10c4667b861c4264d79ad64`	rtf-objdata-decoded	RTF \objdata at offset 0xBA4	24159 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000d08c.bin` `81ac98515bd4de25fc9f4148c41d6c0b489643c09de1fbb1e6bb969a785f1b01`	rtf-objdata-decoded	RTF \objdata at offset 0xD08C	2632 bytes
`objdata_02_off0000e62f.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xE62F	12297 bytes

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