RTF malware analysis — malicious · 5bf0104300255890

MALICIOUS

RTF

347.3 KB First seen: 2021-06-17

MD5: 8e2770383c64b266dcd5fd830aff93f5 SHA-1: 151529933b0d5f13861e03e1c9d9061c9cbee87b SHA-256: 5bf01043002558909c5d517bff9c4bd9c457f59cc42a01bea3518b0e8e88fa66

280 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of malicious OLE object embedding and automatic linking, specifically related to CVE-2017-8570. The document body explicitly instructs the user to 'download the document and click Enable Editing', which is a common lure to bypass security measures. The presence of shellcode command strings and extracted artifacts like 'objdata_01_off00007114.bin' suggests that the file is designed to execute a secondary payload.

Heuristics 8

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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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.
Suspicious extracted artifact high 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.
OLE object data medium RTF_OBJDATA

RTF contains 4 \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

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000965.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x965	66006 bytes
SHA-256: `92488db1ab97a30442a89d1d5df300e2dad1d933a479c32a258b16f89e912fa6`
`objdata_01_off00007114.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x7114	65979 bytes
SHA-256: `dcf037038e5156e9bda54fbcfa72e69ee1568a0baa17c9c5565bb604b5c26ec6`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell"")")
`objdata_02_off000289c9.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x289C9	2632 bytes
SHA-256: `32e8e449cdc043249ce37c79c9eaf2af80a02cb8175718a8a0ce726d961b7d16`
`objdata_03_off00029f6c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x29F6C	12297 bytes
SHA-256: `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`

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