Analysis
- max time kernel
149s - max time network
149s - platform
windows11-21h2_x64 - resource
win11-20251231-en - resource tags
- submitted
08/01/2026, 08:31
General
- Target ARRIVAL-NOTICE-pdf.exe
- Size 572KB
- Sample260108-keytjses4e
- SHA256 a2872a57bbad4ddbd5a46e2bd32d502b0f8e0682d89869b72613d5bd5f74b580
Malware Config
Signatures
- Formbook
Formbook is a data stealing malware which is capable of stealing data.
- Formbook family
- Formbook payload 3 IoCs
- Loads dropped DLL 2 IoCs
- Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs
- Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs
- Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs
- Drops file in Program Files directory 1 IoCs
- Drops file in Windows directory 1 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- System Location Discovery: System Language Discovery 1 TTPs 2 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
- Suspicious behavior: EnumeratesProcesses 14 IoCs
- Suspicious behavior: MapViewOfSection 1 IoCs
- Suspicious use of WriteProcessMemory 4 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\ARRIVAL-NOTICE-pdf.exe"C:\Users\Admin\AppData\Local\Temp\ARRIVAL-NOTICE-pdf.exe"1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Drops file in Program Files directory
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\ARRIVAL-NOTICE-pdf.exe"C:\Users\Admin\AppData\Local\Temp\ARRIVAL-NOTICE-pdf.exe"2⤵
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C:\Users\Admin\AppData\Local\Temp\ARRIVAL-NOTICE-pdf.exe"C:\Users\Admin\AppData\Local\Temp\ARRIVAL-NOTICE-pdf.exe"2⤵
- Suspicious use of NtCreateThreadExHideFromDebugger
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\ARRIVAL-NOTICE-pdf.exe"C:\Users\Admin\AppData\Local\Temp\ARRIVAL-NOTICE-pdf.exe"3⤵
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Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
nscBE21.tmp
nsdC17F.tmp
nsdC17F.tmp
nsdC17F.tmp
nsdC17F.tmp
nsdC17F.tmp
System.dll
nstC22C.tmp
nstC22C.tmp
nstC22C.tmp
nsxC026.tmp
memory/5368-575-0x0000000000400000-0x0000000001717000-memory.dmp
memory/5368-591-0x0000000077E41000-0x0000000077F63000-memory.dmp
memory/5368-576-0x0000000077ED8000-0x0000000077ED9000-memory.dmp
memory/5368-578-0x0000000077EEB000-0x0000000077EEC000-memory.dmp
memory/5368-577-0x0000000077F6B000-0x0000000077F6C000-memory.dmp
memory/5368-590-0x0000000000400000-0x0000000001717000-memory.dmp
memory/5368-592-0x0000000000401000-0x0000000000404000-memory.dmp
memory/5368-600-0x0000000000400000-0x0000000001717000-memory.dmp
memory/5368-593-0x0000000000400000-0x0000000001717000-memory.dmp
memory/5368-594-0x0000000000400000-0x0000000001717000-memory.dmp
memory/5368-595-0x0000000000400000-0x0000000001717000-memory.dmp
memory/5368-596-0x0000000077F6B000-0x0000000077F6C000-memory.dmp
memory/5368-597-0x0000000000401000-0x0000000000404000-memory.dmp
memory/5468-574-0x0000000074BE5000-0x0000000074BE6000-memory.dmp