RTF malware analysis — malicious · 2c8edac8eb937ca6

MALICIOUS

RTF

230.4 KB First seen: 2022-07-14

MD5: e6228c31cd182674870fada00abed792 SHA-1: 8d71bf8690bf0fcd98503a572820b974080f5ef6 SHA-256: 2c8edac8eb937ca64390b51ae55932e2c6b2dd4efe6e616928f5c6ab5b720cf4

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.005 Visual Basic T1137.001 DLL Search Order Hijacking T1137.002 DLL Side-Loading

The RTF document contains multiple OLE objects and triggers ".objupdate" directives, indicating an attempt to exploit OLE functionality. The presence of a Composite Moniker specifically points to CVE-2017-8570, a known vulnerability used to drop and execute SCT scripts. The document body's instruction to 'Enable Editing' is a common lure to bypass security measures and facilitate the execution of these embedded malicious components.

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.
\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 3 \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
Suspicious extracted artifact medium 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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000ba3.bin` `0a366895037ab3941e1e4c2f0a70469757494b2b4aaab20ecc9ae8d5828846e0`	rtf-objdata-decoded	RTF \objdata at offset 0xBA3	21581 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000bb99.bin` `0f2cec052fe8f824845b1aa6e0804ad719eb3010400f0023038dbc39515992c2`	rtf-objdata-decoded	RTF \objdata at offset 0xBB99	2632 bytes
`objdata_02_off0000d13c.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xD13C	12297 bytes

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