RTF / .DOC malware analysis — malicious · 02c49bf8de38bb3a

MALICIOUS

RTF / .DOC

218.9 KB First seen: 2022-04-09

MD5: bb5adab1f2902f0b4f3191db45f939b6 SHA-1: f1f9558af2da995b10caec172aff21cb91a688a3 SHA-256: 02c49bf8de38bb3ae4ac1bd4dcdbb40039e5b5a3ffc3f444c82e92cc8c63ceb4

200 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF document contains OLE objects and triggers heuristics related to CVE-2017-8570, indicating it exploits a vulnerability to drop a script. The document body explicitly prompts the user to 'Enable Editing', a common lure for macro-enabled malware. The exploitation of a composite moniker suggests a client-side execution vulnerability, likely leading to the execution of a second-stage 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_off00000ba2.bin` `b3487dff8851e159f3c480f0b34dd403cdb315efa2c7af72bb3fbde4edf9b673`	rtf-objdata-decoded	RTF \objdata at offset 0xBA2	15933 bytes
`objdata_01_off00008db4.bin` `1721aab459b68b884f13b5caf8aed48f2f1a5eb3d65c1b2ddac08c7c93062de4`	rtf-objdata-decoded	RTF \objdata at offset 0x8DB4	2632 bytes
`objdata_02_off0000a357.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0xA357	12297 bytes

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