Analysis
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max time kernel
95s -
max time network
143s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-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:\ProgramData\Package Cache\{4d8dcf8c-a72a-43e1-9833-c12724db736e}\4D33-Readme.txt
netwalker
Signatures
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Detected Netwalker Ransomware 64 IoCs
Detected unpacked Netwalker executable.
resource yara_rule behavioral2/memory/2716-0-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-2-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-3-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-7-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-17-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-29-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-35-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-65-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2644-95-0x0000000000C40000-0x0000000000C59000-memory.dmp netwalker_ransomware behavioral2/memory/2716-64-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-63-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-62-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-61-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-60-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-59-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-58-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-57-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-56-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-55-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-54-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-53-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-52-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-51-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-50-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-49-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-48-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-47-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-46-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-45-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-44-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-43-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-42-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-41-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-40-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-39-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-34-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-33-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-32-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-31-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-30-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-28-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-26-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-25-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-24-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-23-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-22-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-21-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-20-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-19-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-18-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-16-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-14-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-13-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-12-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-11-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-10-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-15-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-9-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-8-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-6-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-5-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-4-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2716-1739-0x0000000000630000-0x0000000000649000-memory.dmp netwalker_ransomware behavioral2/memory/2644-1740-0x0000000000C40000-0x0000000000C59000-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 (154) 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 2716 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\4d333b22 = "C:\\Program Files (x86)\\4d333b22\\4d333b22.exe" explorer.exe -
Suspicious use of SetThreadContext 1 IoCs
description pid Process procid_target PID 956 set thread context of 2716 956 2025-01-22_12448b9b16e1c3a907f669ff5906046d_babuk_mailto.exe 82 -
Drops file in Program Files directory 2 IoCs
description ioc Process File created C:\Program Files (x86)\4d333b22\4d333b22.exe explorer.exe File opened for modification C:\Program Files (x86)\4d333b22\4d333b22.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 explorer.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language explorer.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language notepad.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language 2025-01-22_12448b9b16e1c3a907f669ff5906046d_babuk_mailto.exe -
Interacts with shadow copies 3 TTPs 2 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
pid Process 5756 vssadmin.exe 4832 vssadmin.exe -
Suspicious behavior: EnumeratesProcesses 64 IoCs
pid Process 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe 2644 explorer.exe -
Suspicious behavior: MapViewOfSection 2 IoCs
pid Process 956 2025-01-22_12448b9b16e1c3a907f669ff5906046d_babuk_mailto.exe 2716 explorer.exe -
Suspicious use of AdjustPrivilegeToken 4 IoCs
description pid Process Token: SeDebugPrivilege 2644 explorer.exe Token: SeBackupPrivilege 7648 vssvc.exe Token: SeRestorePrivilege 7648 vssvc.exe Token: SeAuditPrivilege 7648 vssvc.exe -
Suspicious use of WriteProcessMemory 13 IoCs
description pid Process procid_target PID 956 wrote to memory of 2716 956 2025-01-22_12448b9b16e1c3a907f669ff5906046d_babuk_mailto.exe 82 PID 956 wrote to memory of 2716 956 2025-01-22_12448b9b16e1c3a907f669ff5906046d_babuk_mailto.exe 82 PID 956 wrote to memory of 2716 956 2025-01-22_12448b9b16e1c3a907f669ff5906046d_babuk_mailto.exe 82 PID 2716 wrote to memory of 2644 2716 explorer.exe 83 PID 2716 wrote to memory of 2644 2716 explorer.exe 83 PID 2716 wrote to memory of 2644 2716 explorer.exe 83 PID 2644 wrote to memory of 4832 2644 explorer.exe 84 PID 2644 wrote to memory of 4832 2644 explorer.exe 84 PID 2716 wrote to memory of 5716 2716 explorer.exe 95 PID 2716 wrote to memory of 5716 2716 explorer.exe 95 PID 2716 wrote to memory of 5716 2716 explorer.exe 95 PID 2716 wrote to memory of 5756 2716 explorer.exe 96 PID 2716 wrote to memory of 5756 2716 explorer.exe 96 -
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:956 -
C:\Windows\SysWOW64\explorer.exe"C:\Windows\system32\explorer.exe"2⤵
- Deletes itself
- Adds Run key to start application
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2716 -
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:2644 -
C:\Windows\system32\vssadmin.exeC:\Windows\system32\vssadmin.exe delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:4832
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C:\Windows\SysWOW64\notepad.exeC:\Windows\system32\notepad.exe C:\Users\Admin\Desktop\4D33-Readme.txt3⤵
- System Location Discovery: System Language Discovery
PID:5716
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C:\Windows\system32\vssadmin.exeC:\Windows\system32\vssadmin.exe delete shadows /all /quiet3⤵
- Interacts with shadow copies
PID:5756
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:7648
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C:\Windows\system32\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\Desktop\4D33-Readme.txt1⤵PID:8140
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
1KB
MD51cac7c44fde2bb8e536a3c8c11a3000e
SHA1fec2c9c1c078392a92133e72377ef9d97b062507
SHA256ea50107743e34a4cdd587135510f3050b15cabea872f36133f120c7ca6a5b631
SHA51237b930f830226b4a90437119086b5b28a1d1e6d77fda481591d8ecee5761560a21d0d150e91aaff0dc176f336c4df8afcc970832ff6bbf17c6ca7d133f2db013