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Analysis
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max time kernel
15s -
max time network
19s -
platform
windows7_x64 -
resource
win7-20241010-en -
resource tags
arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system -
submitted
22/01/2025, 20:22
Behavioral task
behavioral1
Sample
2025-01-22_12448b9b16e1c3a907f669ff5906046d_babuk_mailto.exe
Resource
win7-20241010-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\Microsoft Help\F3D3-Readme.txt
netwalker
Signatures
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Detected Netwalker Ransomware 58 IoCs
Detected unpacked Netwalker executable.
resource yara_rule behavioral1/memory/2028-0-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-3-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-4-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-2-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2716-20-0x0000000000080000-0x0000000000099000-memory.dmp netwalker_ransomware behavioral1/memory/2716-30-0x0000000000080000-0x0000000000099000-memory.dmp netwalker_ransomware behavioral1/memory/2028-29-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-28-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-27-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-26-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-25-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-24-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-23-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-22-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-21-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-19-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-18-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-17-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-16-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-15-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-14-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-13-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-12-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-11-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-10-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-9-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-8-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-7-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-6-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-5-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-53-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-52-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-51-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-50-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-49-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-48-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-47-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-46-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-45-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-44-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-43-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-41-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-40-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-39-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-38-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-37-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-36-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-33-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-82-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-80-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-79-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-78-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-77-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-76-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-75-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-69-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-1640-0x00000000000C0000-0x00000000000D9000-memory.dmp netwalker_ransomware behavioral1/memory/2028-1809-0x00000000000C0000-0x00000000000D9000-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 (207) 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 2028 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\f3d39392 = "C:\\Program Files (x86)\\f3d39392\\f3d39392.exe" explorer.exe -
Suspicious use of SetThreadContext 2 IoCs
description pid Process procid_target PID 1056 set thread context of 2028 1056 2025-01-22_12448b9b16e1c3a907f669ff5906046d_babuk_mailto.exe 29 PID 2028 set thread context of 2716 2028 explorer.exe 30 -
Drops file in Program Files directory 2 IoCs
description ioc Process File created C:\Program Files (x86)\f3d39392\f3d39392.exe explorer.exe File opened for modification C:\Program Files (x86)\f3d39392\f3d39392.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 notepad.exe 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 -
Interacts with shadow copies 3 TTPs 2 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
pid Process 2828 vssadmin.exe 316 vssadmin.exe -
Suspicious behavior: EnumeratesProcesses 64 IoCs
pid Process 2028 explorer.exe 2028 explorer.exe 2028 explorer.exe 2028 explorer.exe 2028 explorer.exe 2028 explorer.exe 2028 explorer.exe 2028 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 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 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe 2716 explorer.exe -
Suspicious behavior: MapViewOfSection 2 IoCs
pid Process 1056 2025-01-22_12448b9b16e1c3a907f669ff5906046d_babuk_mailto.exe 2028 explorer.exe -
Suspicious use of AdjustPrivilegeToken 4 IoCs
description pid Process Token: SeDebugPrivilege 2716 explorer.exe Token: SeBackupPrivilege 2928 vssvc.exe Token: SeRestorePrivilege 2928 vssvc.exe Token: SeAuditPrivilege 2928 vssvc.exe -
Suspicious use of WriteProcessMemory 20 IoCs
description pid Process procid_target PID 1056 wrote to memory of 2028 1056 2025-01-22_12448b9b16e1c3a907f669ff5906046d_babuk_mailto.exe 29 PID 1056 wrote to memory of 2028 1056 2025-01-22_12448b9b16e1c3a907f669ff5906046d_babuk_mailto.exe 29 PID 1056 wrote to memory of 2028 1056 2025-01-22_12448b9b16e1c3a907f669ff5906046d_babuk_mailto.exe 29 PID 1056 wrote to memory of 2028 1056 2025-01-22_12448b9b16e1c3a907f669ff5906046d_babuk_mailto.exe 29 PID 2028 wrote to memory of 2716 2028 explorer.exe 30 PID 2028 wrote to memory of 2716 2028 explorer.exe 30 PID 2028 wrote to memory of 2716 2028 explorer.exe 30 PID 2028 wrote to memory of 2716 2028 explorer.exe 30 PID 2716 wrote to memory of 2828 2716 explorer.exe 31 PID 2716 wrote to memory of 2828 2716 explorer.exe 31 PID 2716 wrote to memory of 2828 2716 explorer.exe 31 PID 2716 wrote to memory of 2828 2716 explorer.exe 31 PID 2028 wrote to memory of 1096 2028 explorer.exe 36 PID 2028 wrote to memory of 1096 2028 explorer.exe 36 PID 2028 wrote to memory of 1096 2028 explorer.exe 36 PID 2028 wrote to memory of 1096 2028 explorer.exe 36 PID 2028 wrote to memory of 316 2028 explorer.exe 37 PID 2028 wrote to memory of 316 2028 explorer.exe 37 PID 2028 wrote to memory of 316 2028 explorer.exe 37 PID 2028 wrote to memory of 316 2028 explorer.exe 37 -
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:1056 -
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:2028 -
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:2716 -
C:\Windows\system32\vssadmin.exeC:\Windows\system32\vssadmin.exe delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:2828
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C:\Windows\SysWOW64\notepad.exeC:\Windows\system32\notepad.exe C:\Users\Admin\Desktop\F3D3-Readme.txt3⤵
- System Location Discovery: System Language Discovery
PID:1096
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C:\Windows\system32\vssadmin.exeC:\Windows\system32\vssadmin.exe delete shadows /all /quiet3⤵
- Interacts with shadow copies
PID:316
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2928
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
1KB
MD5a449dec7faa26ff8d5b793a2425261a9
SHA1c4bf801369f7033573485064423fbe95dc2305ba
SHA2567fa992df2f72683db77b8d88cb8dad71779b69f75dfb961f45d6c69d3de2a6a7
SHA512efd90bc3a825048be6f57c008b5e61fa1251bffb06872150c05b8bae6b1178870784de53b6fdc97f6d437d49cf2710f274f6dc78edb8725803066fe241bfe843