RTF / .DOC malware analysis — malicious · 1c77a9354c8b78eb

MALICIOUS

RTF / .DOC

488.1 KB First seen: 2022-10-18

MD5: 97eac9d2f5de0516738991f942ac5a23 SHA-1: a3190f529c5e1acb4dec09d04eb874b61f7f87b8 SHA-256: 1c77a9354c8b78eb256e3cc66cd84383ab510e7c0f7dfeaa729eec4e9f3f0b39

240 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 embedded OLE objects and triggers heuristics related to CVE-2017-8570, indicating it's designed to drop and execute a script. The document body explicitly instructs the user to 'download the document and click Enable Editing', a common lure to bypass security measures and facilitate the execution of embedded malicious content. The primary attack vector appears to be exploiting a vulnerability to download and run a secondary 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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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 4 \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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000983.bin` `5a5c5809b219286b33e9239b31c95d1ff976d96d2c7baa741b2ec1b7a80c953a`	rtf-objdata-decoded	RTF \objdata at offset 0x983	141047 bytes
`objdata_01_off00004291.bin` `7a717e4627e5676c0bb636627362fd2a91dc7411ee48a5403243a67fd8aaac05`	rtf-objdata-decoded	RTF \objdata at offset 0x4291	141021 bytes
`objdata_02_off0004bcfe.bin` `3cd3b7d42e5855c90d6d11c54ef2670ed8970441480cc23f7d39ef08fa1c935b`	rtf-objdata-decoded	RTF \objdata at offset 0x4BCFE	2632 bytes
`objdata_03_off0004d2a1.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0x4D2A1	12297 bytes

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