RTF / .DOC malware analysis — malicious · 0e79f639f267295d

MALICIOUS

RTF / .DOC

386.4 KB

MD5: 86e31c3957ccb853fc6fd4e35c4b9b2f SHA-1: 9276ad3472bdb95f8cf4861efd6f4cdd7d8e1b21 SHA-256: 0e79f639f267295dbe7bea367af95dd7e156bc6230b89bc22aaef4c2488a649c

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 CVE-2017-8570, which is known to drop and execute a script. This indicates an attempt to achieve initial execution on the victim's system, likely delivered as a spearphishing attachment. The specific script dropped is not directly visible, but the exploit itself is a high-confidence indicator of malicious intent.

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_off000007d1.bin` `bfe9a10e6e0c91b01454e6a96025bc6e38c7b7721992044e253155d97b60a6c3`	rtf-objdata-decoded	RTF \objdata at offset 0x7D1	98857 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00032ba4.bin` `7a8598fff434e2b582d3d87e32bb1d356d28f288618d4b03cf39e56767823039`	rtf-objdata-decoded	RTF \objdata at offset 0x32BA4	2632 bytes
`objdata_02_off00034147.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x34147	12297 bytes

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