RTF / .DOC malware analysis — malicious · 10f4d113285a8add

MALICIOUS

RTF / .DOC

232.9 KB First seen: 2022-06-16

MD5: a45c7778c4809ba5d36a7504a6984c76 SHA-1: 26075646d1db532eb551bd452999d318a67c37be SHA-256: 10f4d113285a8add1e2cdf0f0c69cfa734180fa324cfbc8afad7dc3fd1d46f25

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF document contains OLE object data and triggers heuristics related to CVE-2017-8570, which is known to drop SCT scripts. The document body explicitly instructs the user to 'click Enable Editing', a common lure for macro-based malware. The embedded artifacts, particularly objdata_01_off0000c5ab.bin, are associated with the CVE exploit, suggesting it's used to execute a secondary payload, likely a script.

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_off0000095d.bin` `ddd09d1e02ef78acf398cfbcfca960535e72e193a578292d133b278a1949193e`	rtf-objdata-decoded	RTF \objdata at offset 0x95D	23100 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000c5ab.bin` `acfe22ea9e4ff240389575cbfc30c4442fd35fc5f8c4bda2b30eb5c2cf4c1cf0`	rtf-objdata-decoded	RTF \objdata at offset 0xC5AB	2632 bytes
`objdata_02_off0000db4e.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xDB4E	12297 bytes

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