RTF / .DOC malware analysis — malicious · 5ec2e4ef16fcb888

MALICIOUS

RTF / .DOC

217.8 KB First seen: 2022-04-14

MD5: b9d87e75bc2b1aa850368ef63cfcaec9 SHA-1: dcd933286c294c5607fb16e39d643fbd5f9751a3 SHA-256: 5ec2e4ef16fcb888486f788b47dde9b66e2782a69980cb9c30e52bdb10f78f03

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF document contains embedded OLE objects and triggers CVE-2017-8570, which is known to drop SCT scripts. The document body explicitly instructs the user to 'click Enable Editing when opening', indicating a lure to bypass security measures. The embedded artifacts, likely containing malicious scripts, are the primary indicators of compromise.

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` `1deb20ecb72717e0f83e55cdc4ff7c462564ad102fa60f28d0eb267c56e7db3d`	rtf-objdata-decoded	RTF \objdata at offset 0x95D	15670 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000894d.bin` `36dcadcd9dba6c796320cf103eee4d99a0cf65218f74bac40d0f472a6487a1f8`	rtf-objdata-decoded	RTF \objdata at offset 0x894D	2632 bytes
`objdata_02_off00009ef0.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x9EF0	12297 bytes

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