RTF / .DOC malware analysis — malicious · 43ef2091276f3ad2

MALICIOUS

RTF / .DOC

237.4 KB First seen: 2023-03-13

MD5: bcff0721025f0867891bae941b7d5531 SHA-1: b4d06b92bafb6bdfbfc366a0c2f6bc1f8344460a SHA-256: 43ef2091276f3ad2192980f2a2a42f6573753a8707d457d0f43b5a0529936687

200 Risk Score

Malware Insights

MITRE ATT&CK

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

The RTF document contains OLE objects and triggers heuristics related to CVE-2017-8570, which is known to drop SCT scripts. The document body explicitly instructs the user to 'Enable Editing', a common lure to bypass macro security. This suggests the file is designed to exploit the vulnerability to execute a secondary payload.

Heuristics 6

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

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000ba6.bin` `4b47d69a6bc723ea9db3f5ffe19d9efaaa1c9aaa89477f20874509a400824974`	rtf-objdata-decoded	RTF \objdata at offset 0xBA6	24990 bytes
`objdata_01_off0000d74e.bin` `a6611d501e579ac96404a9c19f7f70ee1bd26c5f4967cc103af51e1fde90fca8`	rtf-objdata-decoded	RTF \objdata at offset 0xD74E	2632 bytes
`objdata_02_off0000ecf1.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xECF1	12297 bytes

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