RTF malware analysis — malicious · 2bacbdedbf73e1c9

MALICIOUS

RTF

1.02 MB

MD5: 60d6c27c63c410e06e7528cb86279d2b SHA-1: 072093a317ac7c6960b2de531ab60ab86d0e29b3 SHA-256: 2bacbdedbf73e1c9ce7a1dfe463873237bfd96270b4ac03991c8899df0c76fe5

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, specifically related to CVE-2017-8570, which is known to drop SCT scripts. The document body includes a 'click Enable Editing' lure, indicating an attempt to bypass security measures and execute embedded content. The presence of composite monikers and large amounts of hex-encoded data within OLE objects strongly suggests the embedding of a malicious payload, likely a script that is executed upon enabling editing.

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` `6380276f8ba296e45150873b54da5666494edaa270d528b9482a032034c85167`	rtf-objdata-decoded	RTF \objdata at offset 0xBAD	408280 bytes
`objdata_01_off0000735c.bin` `daa15554b3e662fe7cd4f9b3e58883c22e8a924b733952b3b94f5192cf9589e5`	rtf-objdata-decoded	RTF \objdata at offset 0x735C	408253 bytes
`objdata_02_off000d690b.bin` `51ef705eef602ac6eb91c2063c8f50d4e54b5e051b60429031d41133bc7df645`	rtf-objdata-decoded	RTF \objdata at offset 0xD690B	2632 bytes
`objdata_03_off000d7eae.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0xD7EAE	12297 bytes

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