RTF malware analysis — malicious · 6fe8a75ebe8ccdcb

MALICIOUS

RTF

1.02 MB

MD5: 3f327df4753c877cc8c91a952df75fb9 SHA-1: beb8d21cb4ad2e0e1689b38e2858f1a445e837b5 SHA-256: 6fe8a75ebe8ccdcb36a51231201a8c527cbb85433d51800bfd30d83acab29721

280 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple indicators of malicious OLE object embedding, specifically related to CVE-2017-8570. The presence of ".objdata" sections and Composite Monikers strongly suggests the file is designed to drop and execute a script. The document body also contains a lure instructing the user to 'Enable Editing', a common tactic for malware droppers.

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1037KB of hex-encoded data inside \objdata sections — may hide a payload
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_off00000bad.bin` `1ee6f1a59204805ccd203970c28815f62389baf03b3d374e738bc7535fb0e4cb`	rtf-objdata-decoded	RTF \objdata at offset 0xBAD	408272 bytes
`objdata_01_off0000735c.bin` `47f4f8032e8569f4df700e25243314d73cb82610e2e229c8a008966b681bf214`	rtf-objdata-decoded	RTF \objdata at offset 0x735C	408245 bytes
`objdata_02_off000d68fb.bin` `51ef705eef602ac6eb91c2063c8f50d4e54b5e051b60429031d41133bc7df645`	rtf-objdata-decoded	RTF \objdata at offset 0xD68FB	2632 bytes
`objdata_03_off000d7e9e.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0xD7E9E	12297 bytes

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