Analysis
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max time kernel
77s -
max time network
16s -
platform
windows7_x64 -
resource
win7-20240903-en -
resource tags
arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system -
submitted
23-01-2025 03:46
Behavioral task
behavioral1
Sample
2025-01-22_12448b9b16e1c3a907f669ff5906046d_babuk_mailto.exe
Resource
win7-20240903-en
Behavioral task
behavioral2
Sample
2025-01-22_12448b9b16e1c3a907f669ff5906046d_babuk_mailto.exe
Resource
win10v2004-20241007-en
General
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Target
2025-01-22_12448b9b16e1c3a907f669ff5906046d_babuk_mailto.exe
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Size
82KB
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MD5
12448b9b16e1c3a907f669ff5906046d
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SHA1
264a5f682001eae793103023f35b0a865b48d25b
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SHA256
d68ec0df2b057387bbd78a51054f7c06bdf029337bf9d66c1d411ba0243b2ae5
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SHA512
58870722418a14fbc86062979b8b93fc9aa31848b03217fc7534b6bd9d03383de5ad338cd75376f8bbee378f38d5e473364429cf8bc631a5125e5e65314b7be3
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SSDEEP
1536:yoF+QbXFzvL4ZwxY/ic0ty2XGf0s7pBZWNFMSZs1:yiFF7Loxt0tyAGf0sN5S2
Malware Config
Extracted
C:\Users\Admin\Contacts\70E7-Readme.txt
netwalker
Signatures
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Detected Netwalker Ransomware 59 IoCs
Detected unpacked Netwalker executable.
resource yara_rule behavioral1/memory/1892-0-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-2-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-3-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-4-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-5-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-6-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-7-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/3036-9-0x0000000000080000-0x0000000000099000-memory.dmp netwalker_ransomware behavioral1/memory/1892-8-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/3036-10-0x0000000000080000-0x0000000000099000-memory.dmp netwalker_ransomware behavioral1/memory/1892-61-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-64-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-62-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-60-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-59-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-58-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-57-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-56-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-55-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-54-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-53-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-52-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-51-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-49-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-48-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-47-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-46-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-45-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-44-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-43-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-42-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-41-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-40-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-39-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-38-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-37-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-35-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-33-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-32-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-31-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-30-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-29-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-28-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-27-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-26-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-25-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-24-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-23-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-22-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-21-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-20-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-19-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-18-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-17-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-16-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-15-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-14-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-13-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/1892-1717-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware -
Netwalker Ransomware
Ransomware family with multiple versions. Also known as MailTo.
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Netwalker family
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Deletes shadow copies 3 TTPs
Ransomware often targets backup files to inhibit system recovery.
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Renames multiple (177) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
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Deletes itself 1 IoCs
pid Process 1892 explorer.exe -
Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\70e7e6b8 = "C:\\Program Files (x86)\\70e7e6b8\\70e7e6b8.exe" explorer.exe -
Suspicious use of SetThreadContext 2 IoCs
description pid Process procid_target PID 2176 set thread context of 1892 2176 2025-01-22_12448b9b16e1c3a907f669ff5906046d_babuk_mailto.exe 30 PID 1892 set thread context of 3036 1892 explorer.exe 31 -
Drops file in Program Files directory 2 IoCs
description ioc Process File created C:\Program Files (x86)\70e7e6b8\70e7e6b8.exe explorer.exe File opened for modification C:\Program Files (x86)\70e7e6b8\70e7e6b8.exe explorer.exe -
System Location Discovery: System Language Discovery 1 TTPs 4 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
description ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language 2025-01-22_12448b9b16e1c3a907f669ff5906046d_babuk_mailto.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language explorer.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language explorer.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language notepad.exe -
Interacts with shadow copies 3 TTPs 2 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
pid Process 2528 vssadmin.exe 2580 vssadmin.exe -
Suspicious behavior: EnumeratesProcesses 64 IoCs
pid Process 1892 explorer.exe 1892 explorer.exe 1892 explorer.exe 1892 explorer.exe 1892 explorer.exe 1892 explorer.exe 1892 explorer.exe 1892 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe 3036 explorer.exe -
Suspicious behavior: MapViewOfSection 2 IoCs
pid Process 2176 2025-01-22_12448b9b16e1c3a907f669ff5906046d_babuk_mailto.exe 1892 explorer.exe -
Suspicious use of AdjustPrivilegeToken 4 IoCs
description pid Process Token: SeDebugPrivilege 3036 explorer.exe Token: SeBackupPrivilege 1856 vssvc.exe Token: SeRestorePrivilege 1856 vssvc.exe Token: SeAuditPrivilege 1856 vssvc.exe -
Suspicious use of WriteProcessMemory 20 IoCs
description pid Process procid_target PID 2176 wrote to memory of 1892 2176 2025-01-22_12448b9b16e1c3a907f669ff5906046d_babuk_mailto.exe 30 PID 2176 wrote to memory of 1892 2176 2025-01-22_12448b9b16e1c3a907f669ff5906046d_babuk_mailto.exe 30 PID 2176 wrote to memory of 1892 2176 2025-01-22_12448b9b16e1c3a907f669ff5906046d_babuk_mailto.exe 30 PID 2176 wrote to memory of 1892 2176 2025-01-22_12448b9b16e1c3a907f669ff5906046d_babuk_mailto.exe 30 PID 1892 wrote to memory of 3036 1892 explorer.exe 31 PID 1892 wrote to memory of 3036 1892 explorer.exe 31 PID 1892 wrote to memory of 3036 1892 explorer.exe 31 PID 1892 wrote to memory of 3036 1892 explorer.exe 31 PID 3036 wrote to memory of 2580 3036 explorer.exe 32 PID 3036 wrote to memory of 2580 3036 explorer.exe 32 PID 3036 wrote to memory of 2580 3036 explorer.exe 32 PID 3036 wrote to memory of 2580 3036 explorer.exe 32 PID 1892 wrote to memory of 4040 1892 explorer.exe 37 PID 1892 wrote to memory of 4040 1892 explorer.exe 37 PID 1892 wrote to memory of 4040 1892 explorer.exe 37 PID 1892 wrote to memory of 4040 1892 explorer.exe 37 PID 1892 wrote to memory of 2528 1892 explorer.exe 38 PID 1892 wrote to memory of 2528 1892 explorer.exe 38 PID 1892 wrote to memory of 2528 1892 explorer.exe 38 PID 1892 wrote to memory of 2528 1892 explorer.exe 38 -
Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
Processes
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C:\Users\Admin\AppData\Local\Temp\2025-01-22_12448b9b16e1c3a907f669ff5906046d_babuk_mailto.exe"C:\Users\Admin\AppData\Local\Temp\2025-01-22_12448b9b16e1c3a907f669ff5906046d_babuk_mailto.exe"1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2176 -
C:\Windows\SysWOW64\explorer.exe"C:\Windows\system32\explorer.exe"2⤵
- Deletes itself
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1892 -
C:\Windows\SysWOW64\explorer.exe"C:\Windows\system32\explorer.exe"3⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3036 -
C:\Windows\system32\vssadmin.exeC:\Windows\system32\vssadmin.exe delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:2580
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C:\Windows\SysWOW64\notepad.exeC:\Windows\system32\notepad.exe C:\Users\Admin\Desktop\70E7-Readme.txt3⤵
- System Location Discovery: System Language Discovery
PID:4040
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C:\Windows\system32\vssadmin.exeC:\Windows\system32\vssadmin.exe delete shadows /all /quiet3⤵
- Interacts with shadow copies
PID:2528
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1856
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C:\Windows\system32\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\Desktop\70E7-Readme.txt1⤵PID:2620
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
1KB
MD54a169e0774726e9a18a2c325d5902474
SHA17cf2a04e74860f16e0ab9b9d10258212547c6695
SHA256195a202adc99f65bd6e05ae27936f3a9f1c54994dee8ae95fd277fe907e7ce6e
SHA5121693fbdaf8023d8ca7dffc0eeac36b70ddfb546f6763f8198d13fb7080c88290eca3c417f95f7ed10154a417eaa08c70f935227acbc83d18ad8904390a2b23f0