RTF malware analysis — malicious · 3c77ba2d84d91215

MALICIOUS

RTF

1.02 MB

MD5: 9c641651b430f3250a63877c74d77e7a SHA-1: d47fcd5f7636703215d6a8434a3d8a98e18135b1 SHA-256: 3c77ba2d84d91215e09d96edf47de3113194ee4154b0e38b9bf5de1d4d44031d

280 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF document contains multiple indicators of malicious OLE object embedding, including composite monikers and automatic linking, strongly suggesting exploitation of CVE-2017-8570. The document body explicitly instructs the user to 'download the document and click Enable Editing', a common lure to bypass security measures. The presence of OLE object data, particularly the decoded objdata at offset 0xD66BC associated with CVE-2017-8570, indicates the likely execution of a script or 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.
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_off00000966.bin` `b5ed39ed67d070293735193b41288a1c424d0f10282840f5d6d36b451f371bce`	rtf-objdata-decoded	RTF \objdata at offset 0x966	408276 bytes
`objdata_01_off00007115.bin` `a111ff482c1c07951f34392991004bffb26a20f03a9300950f6e367ad7ed3266`	rtf-objdata-decoded	RTF \objdata at offset 0x7115	408249 bytes
`objdata_02_off000d66bc.bin` `51ef705eef602ac6eb91c2063c8f50d4e54b5e051b60429031d41133bc7df645`	rtf-objdata-decoded	RTF \objdata at offset 0xD66BC	2632 bytes
`objdata_03_off000d7c5f.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0xD7C5F	12297 bytes

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