Analysis
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max time kernel
166s -
max time network
176s -
platform
windows10-2004_x64 -
resource
win10v2004-20220721-en -
resource tags
arch:x64arch:x86image:win10v2004-20220721-enlocale:en-usos:windows10-2004-x64system -
submitted
06-08-2022 18:26
Behavioral task
behavioral1
Sample
Serveftgr.exe
Resource
win7-20220718-en
General
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Target
Serveftgr.exe
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Size
93KB
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MD5
97266b25a791e68493ea2563306c7cf0
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SHA1
d161fff47235e7d60209b6feae74019e6d000297
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SHA256
f9dfaeff5fd22709b5cd29cb23c6f7c81f392f3a2d88c2bcf09fb4b599fb6f30
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SHA512
9eac60682d5ce4398dfd45449fde4272cba942fa01afe7034ef0b1393605f7a65997a52c9ae960d87d973dab1c9c2f0dfa339ae921470664f241a71cc9d82d09
Malware Config
Extracted
njrat
0.7d
HacKed
c3VzaWFoYXQyNDE5OWEuZGRucy5uZXQStrik:NTU1Mg==
a8f08fa23dbc544d76787e679872404a
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reg_key
a8f08fa23dbc544d76787e679872404a
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splitter
|'|'|
Signatures
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Executes dropped EXE 1 IoCs
Processes:
server.exepid process 624 server.exe -
Modifies Windows Firewall 1 TTPs 3 IoCs
Processes:
netsh.exenetsh.exenetsh.exepid process 4688 netsh.exe 1112 netsh.exe 4396 netsh.exe -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
Serveftgr.exedescription ioc process Key value queried \REGISTRY\USER\S-1-5-21-1101907861-274115917-2188613224-1000\Control Panel\International\Geo\Nation Serveftgr.exe -
Drops startup file 6 IoCs
Processes:
server.exedescription ioc process File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\a8f08fa23dbc544d76787e679872404aWindows Update.exe server.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\a8f08fa23dbc544d76787e679872404aWindows Update.exe server.exe File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Explorer.exe server.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Explorer.exe server.exe File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Microsoft Corporation.exe server.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Microsoft Corporation.exe server.exe -
Drops file in System32 directory 1 IoCs
Processes:
server.exedescription ioc process File created C:\Windows\SysWOW64\Explorer.exe server.exe -
Drops file in Program Files directory 2 IoCs
Processes:
server.exedescription ioc process File created C:\Program Files (x86)\Explorer.exe server.exe File opened for modification C:\Program Files (x86)\Explorer.exe server.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Suspicious behavior: EnumeratesProcesses 64 IoCs
Processes:
server.exepid process 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe 624 server.exe -
Suspicious behavior: GetForegroundWindowSpam 1 IoCs
Processes:
server.exepid process 624 server.exe -
Suspicious use of AdjustPrivilegeToken 37 IoCs
Processes:
server.exedescription pid process Token: SeDebugPrivilege 624 server.exe Token: 33 624 server.exe Token: SeIncBasePriorityPrivilege 624 server.exe Token: 33 624 server.exe Token: SeIncBasePriorityPrivilege 624 server.exe Token: 33 624 server.exe Token: SeIncBasePriorityPrivilege 624 server.exe Token: 33 624 server.exe Token: SeIncBasePriorityPrivilege 624 server.exe Token: 33 624 server.exe Token: SeIncBasePriorityPrivilege 624 server.exe Token: 33 624 server.exe Token: SeIncBasePriorityPrivilege 624 server.exe Token: 33 624 server.exe Token: SeIncBasePriorityPrivilege 624 server.exe Token: 33 624 server.exe Token: SeIncBasePriorityPrivilege 624 server.exe Token: 33 624 server.exe Token: SeIncBasePriorityPrivilege 624 server.exe Token: 33 624 server.exe Token: SeIncBasePriorityPrivilege 624 server.exe Token: 33 624 server.exe Token: SeIncBasePriorityPrivilege 624 server.exe Token: 33 624 server.exe Token: SeIncBasePriorityPrivilege 624 server.exe Token: 33 624 server.exe Token: SeIncBasePriorityPrivilege 624 server.exe Token: 33 624 server.exe Token: SeIncBasePriorityPrivilege 624 server.exe Token: 33 624 server.exe Token: SeIncBasePriorityPrivilege 624 server.exe Token: 33 624 server.exe Token: SeIncBasePriorityPrivilege 624 server.exe Token: 33 624 server.exe Token: SeIncBasePriorityPrivilege 624 server.exe Token: 33 624 server.exe Token: SeIncBasePriorityPrivilege 624 server.exe -
Suspicious use of WriteProcessMemory 12 IoCs
Processes:
Serveftgr.exeserver.exedescription pid process target process PID 1432 wrote to memory of 624 1432 Serveftgr.exe server.exe PID 1432 wrote to memory of 624 1432 Serveftgr.exe server.exe PID 1432 wrote to memory of 624 1432 Serveftgr.exe server.exe PID 624 wrote to memory of 4396 624 server.exe netsh.exe PID 624 wrote to memory of 4396 624 server.exe netsh.exe PID 624 wrote to memory of 4396 624 server.exe netsh.exe PID 624 wrote to memory of 4688 624 server.exe netsh.exe PID 624 wrote to memory of 4688 624 server.exe netsh.exe PID 624 wrote to memory of 4688 624 server.exe netsh.exe PID 624 wrote to memory of 1112 624 server.exe netsh.exe PID 624 wrote to memory of 1112 624 server.exe netsh.exe PID 624 wrote to memory of 1112 624 server.exe netsh.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\Serveftgr.exe"C:\Users\Admin\AppData\Local\Temp\Serveftgr.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1432 -
C:\Users\Admin\AppData\Local\Temp\server.exe"C:\Users\Admin\AppData\Local\Temp\server.exe"2⤵
- Executes dropped EXE
- Drops startup file
- Drops file in System32 directory
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:624 -
C:\Windows\SysWOW64\netsh.exenetsh firewall add allowedprogram "C:\Users\Admin\AppData\Local\Temp\server.exe" "server.exe" ENABLE3⤵
- Modifies Windows Firewall
PID:4396 -
C:\Windows\SysWOW64\netsh.exenetsh firewall delete allowedprogram "C:\Users\Admin\AppData\Local\Temp\server.exe"3⤵
- Modifies Windows Firewall
PID:4688 -
C:\Windows\SysWOW64\netsh.exenetsh firewall add allowedprogram "C:\Users\Admin\AppData\Local\Temp\server.exe" "server.exe" ENABLE3⤵
- Modifies Windows Firewall
PID:1112
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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C:\Users\Admin\AppData\Local\Temp\server.exeFilesize
93KB
MD597266b25a791e68493ea2563306c7cf0
SHA1d161fff47235e7d60209b6feae74019e6d000297
SHA256f9dfaeff5fd22709b5cd29cb23c6f7c81f392f3a2d88c2bcf09fb4b599fb6f30
SHA5129eac60682d5ce4398dfd45449fde4272cba942fa01afe7034ef0b1393605f7a65997a52c9ae960d87d973dab1c9c2f0dfa339ae921470664f241a71cc9d82d09
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C:\Users\Admin\AppData\Local\Temp\server.exeFilesize
93KB
MD597266b25a791e68493ea2563306c7cf0
SHA1d161fff47235e7d60209b6feae74019e6d000297
SHA256f9dfaeff5fd22709b5cd29cb23c6f7c81f392f3a2d88c2bcf09fb4b599fb6f30
SHA5129eac60682d5ce4398dfd45449fde4272cba942fa01afe7034ef0b1393605f7a65997a52c9ae960d87d973dab1c9c2f0dfa339ae921470664f241a71cc9d82d09
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C:\Users\Admin\AppData\Roaming\appFilesize
4B
MD53eb8a6afa534fadc147aa70dea76e863
SHA103b827d99098f69c9f126679598f7166c99d1624
SHA256d3d1d98df443947ab0b52378acbb5f5c21593677b45f0403b3831c93d8be7fca
SHA512b9d20e1f18dd2dc9a71e436e5c27854196f1f8f0adfbf59aed9d70ab83b88c2c39958720508e87d98f8cb23dcb7bbaa81825406439edcc07b6d2ee310acd4327
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memory/624-131-0x0000000000000000-mapping.dmp
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memory/624-135-0x00000000751D0000-0x0000000075781000-memory.dmpFilesize
5.7MB
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memory/624-140-0x00000000751D0000-0x0000000075781000-memory.dmpFilesize
5.7MB
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memory/1112-139-0x0000000000000000-mapping.dmp
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memory/1432-130-0x00000000751D0000-0x0000000075781000-memory.dmpFilesize
5.7MB
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memory/1432-134-0x00000000751D0000-0x0000000075781000-memory.dmpFilesize
5.7MB
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memory/4396-137-0x0000000000000000-mapping.dmp
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memory/4688-138-0x0000000000000000-mapping.dmp