RTF / .DOC malware analysis — malicious · 4756801203243db6

MALICIOUS

RTF / .DOC

233.5 KB First seen: 2022-06-21

MD5: 0cdb29ddc64df2bcce439009258b5793 SHA-1: 32d851234808ee1412d8623b15378c51b723393e SHA-256: 4756801203243db65820ae473cc9fe90f87a2a15e4ab6f8d15df42f7c9cfe365

220 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.005 Visual Basic

The RTF document contains OLE object data and triggers an objupdate event, indicating an attempt to activate embedded objects. Heuristics confirm the exploitation of CVE-2017-8570, which is known to drop SCT scripts. The document body includes a common lure instructing the user to 'Enable Editing' to view the content, facilitating the exploit. This suggests the file is designed to drop and execute a malicious script via the CVE-2017-8570 vulnerability.

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` `739b7936caef3a3472bf3e9afdc5094c89863b8e612caf226cd89a6640937e11`	rtf-objdata-decoded	RTF \objdata at offset 0xBA4	23108 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000c802.bin` `4aa0e7f5ab53bb62fd4a60818892a21fcbe35dba260d2112984f00988c699ebb`	rtf-objdata-decoded	RTF \objdata at offset 0xC802	2632 bytes
`objdata_02_off0000dda5.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xDDA5	12297 bytes

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