RTF / .DOC malware analysis — malicious · 81c575e6885c8e04

MALICIOUS

RTF / .DOC

386.5 KB

MD5: bca1ce16458a693dd17230a64dbaf504 SHA-1: 2eaabff447a956166b45d6d758974190b11c85cb SHA-256: 81c575e6885c8e045673461dde404978c813304306de20708e2787618f0d0ae1

200 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains OLE objects and triggers the CVE-2017-8570 vulnerability via a Composite Moniker. This vulnerability is known to drop and execute a script, likely an SCT file, which is then executed by the system. The embedded OLE objects and the specific CVE exploited indicate a malicious intent to execute arbitrary code.

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
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_off000007d0.bin` `d6657db9d3617b5530a9dac6d56d073459c1e40b724c68091be1aca5c748aeb2`	rtf-objdata-decoded	RTF \objdata at offset 0x7D0	98921 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00032c29.bin` `c1062dbe2c516490ba03c091a3be0d514bef7428a936eb00367c1b3069f9cedc`	rtf-objdata-decoded	RTF \objdata at offset 0x32C29	2632 bytes
`objdata_02_off000341cc.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x341CC	12297 bytes

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