RTF / .DOC malware analysis — malicious · f2f01e805c3ae507

MALICIOUS

RTF / .DOC

233.5 KB First seen: 2022-06-24

MD5: d493f543bd4e59ec7dd6645e834e75d9 SHA-1: 3d1cabf83ce2ea96600ad44cbdf3087f28fa9fdc SHA-256: f2f01e805c3ae5075e314e1c576d036899cea4048cd24a1b2d4bd968a892f8a4

220 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1559.002 Component Object Model Hijacking T1059.005 Visual Basic

The RTF document contains OLE object data and triggers an objupdate event, indicating an attempt to activate embedded objects. The critical heuristic firing for CVE_2017_8570 confirms the exploitation of this vulnerability, which is known to drop SCT scripts. The document body explicitly prompts the user to 'Enable Editing', a common lure to bypass macro security. The exploitation of CVE-2017-8570 facilitates the execution of a script, likely for further payload delivery.

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_off00000ba4.bin` `9e2f502e31285e2cf25590f15831b09f3327134103160ba6887deeacc0fc7282`	rtf-objdata-decoded	RTF \objdata at offset 0xBA4	23124 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000c824.bin` `625ba87dad062d63542a2f08013c93a4f9eac2363a88c9240f1688e698b82c02`	rtf-objdata-decoded	RTF \objdata at offset 0xC824	2632 bytes
`objdata_02_off0000ddc7.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xDDC7	12297 bytes

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