RTF malware analysis — malicious · 57bb59a2c491b89b

MALICIOUS

RTF

662.3 KB

MD5: 47a5e618c809f1f37bccced9d3536deb SHA-1: da3a6f5851537edffcc29e9bf4282d552090ce6e SHA-256: 57bb59a2c491b89b3321428121ba1b5e88daca5a8e379fde41afc73e9679d752

240 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, specifically related to CVE-2017-8570 which is known to drop SCT scripts. The document body contains a lure instructing the user to enable editing, a common tactic for macro-based malware. The presence of composite monikers and objdata sections strongly suggests the exploitation of this vulnerability to execute arbitrary code.

Heuristics 7

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.
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` `3774e36c866cbfeef8538f5248205f2a88e939c4e7d51e4f19360d050cf7abcf`	rtf-objdata-decoded	RTF \objdata at offset 0x965	221069 bytes
`objdata_01_off00007114.bin` `72c4a0d6c14effd2bd17f743c01cad02c8d5db027de3dca1f3f37e17d7f35776`	rtf-objdata-decoded	RTF \objdata at offset 0x7114	221042 bytes
`objdata_02_off000775ab.bin` `51ef705eef602ac6eb91c2063c8f50d4e54b5e051b60429031d41133bc7df645`	rtf-objdata-decoded	RTF \objdata at offset 0x775AB	2632 bytes
`objdata_03_off00078b4e.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0x78B4E	12297 bytes

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