Analysis
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max time kernel
181s -
max time network
195s -
platform
windows10-2004_x64 -
resource
win10v2004-20220414-en -
submitted
30-05-2022 21:39
Static task
static1
Behavioral task
behavioral1
Sample
08858e8984291d023391d7ae86261273f35bfde102368459b9f0c99dddf688a8.exe
Resource
win7-20220414-en
General
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Target
08858e8984291d023391d7ae86261273f35bfde102368459b9f0c99dddf688a8.exe
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Size
3.6MB
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MD5
e940b879305a2ecdf3a08dd1fbde6c16
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SHA1
927518df1e8d041e0f1390d9819cb0593e108dd8
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SHA256
08858e8984291d023391d7ae86261273f35bfde102368459b9f0c99dddf688a8
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SHA512
b0d6241b3b12cf39578a42db915600ecac0de199061693043bde046633a221c554ff6a26bb20767520f9fbfdbf11c23af01c31b45ba50d635006b66d83de451f
Malware Config
Extracted
vidar
9.7
231
http://bestbtcchange.com/
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profile_id
231
Signatures
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Vidar Stealer 2 IoCs
Processes:
resource yara_rule behavioral2/memory/4472-148-0x0000000000400000-0x0000000000CA3000-memory.dmp family_vidar behavioral2/memory/4472-150-0x0000000000400000-0x0000000000CA3000-memory.dmp family_vidar -
Executes dropped EXE 2 IoCs
Processes:
busshost.exeYTLoader.exepid process 4472 busshost.exe 4620 YTLoader.exe -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
08858e8984291d023391d7ae86261273f35bfde102368459b9f0c99dddf688a8.exedescription ioc process Key value queried \REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\Control Panel\International\Geo\Nation 08858e8984291d023391d7ae86261273f35bfde102368459b9f0c99dddf688a8.exe -
Reads local data of messenger clients 2 TTPs
Infostealers often target stored data of messaging applications, which can include saved credentials and account information.
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Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
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Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
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Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
Processes:
flow ioc 21 ip-api.com -
Drops file in Program Files directory 4 IoCs
Processes:
08858e8984291d023391d7ae86261273f35bfde102368459b9f0c99dddf688a8.exedescription ioc process File opened for modification C:\Program Files (x86)\LetsSee!\YTLoader.exe 08858e8984291d023391d7ae86261273f35bfde102368459b9f0c99dddf688a8.exe File opened for modification C:\Program Files (x86)\LetsSee!\busshost.exe 08858e8984291d023391d7ae86261273f35bfde102368459b9f0c99dddf688a8.exe File opened for modification C:\Program Files (x86)\LetsSee!\Uninstall.exe 08858e8984291d023391d7ae86261273f35bfde102368459b9f0c99dddf688a8.exe File created C:\Program Files (x86)\LetsSee!\Uninstall.ini 08858e8984291d023391d7ae86261273f35bfde102368459b9f0c99dddf688a8.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Program crash 1 IoCs
Processes:
WerFault.exepid pid_target process target process 2692 4620 WerFault.exe YTLoader.exe -
Checks processor information in registry 2 TTPs 4 IoCs
Processor information is often read in order to detect sandboxing environments.
Processes:
YTLoader.exebusshost.exedescription ioc process Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 YTLoader.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString YTLoader.exe Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 busshost.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString busshost.exe -
Enumerates system info in registry 2 TTPs 3 IoCs
Processes:
YTLoader.exedescription ioc process Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS YTLoader.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemManufacturer YTLoader.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemProductName YTLoader.exe -
Suspicious behavior: EnumeratesProcesses 8 IoCs
Processes:
busshost.exepid process 4472 busshost.exe 4472 busshost.exe 4472 busshost.exe 4472 busshost.exe 4472 busshost.exe 4472 busshost.exe 4472 busshost.exe 4472 busshost.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
Processes:
YTLoader.exedescription pid process Token: SeDebugPrivilege 4620 YTLoader.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
08858e8984291d023391d7ae86261273f35bfde102368459b9f0c99dddf688a8.exedescription pid process target process PID 4372 wrote to memory of 4472 4372 08858e8984291d023391d7ae86261273f35bfde102368459b9f0c99dddf688a8.exe busshost.exe PID 4372 wrote to memory of 4472 4372 08858e8984291d023391d7ae86261273f35bfde102368459b9f0c99dddf688a8.exe busshost.exe PID 4372 wrote to memory of 4472 4372 08858e8984291d023391d7ae86261273f35bfde102368459b9f0c99dddf688a8.exe busshost.exe PID 4372 wrote to memory of 4620 4372 08858e8984291d023391d7ae86261273f35bfde102368459b9f0c99dddf688a8.exe YTLoader.exe PID 4372 wrote to memory of 4620 4372 08858e8984291d023391d7ae86261273f35bfde102368459b9f0c99dddf688a8.exe YTLoader.exe PID 4372 wrote to memory of 4620 4372 08858e8984291d023391d7ae86261273f35bfde102368459b9f0c99dddf688a8.exe YTLoader.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\08858e8984291d023391d7ae86261273f35bfde102368459b9f0c99dddf688a8.exe"C:\Users\Admin\AppData\Local\Temp\08858e8984291d023391d7ae86261273f35bfde102368459b9f0c99dddf688a8.exe"1⤵
- Checks computer location settings
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
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C:\Program Files (x86)\LetsSee!\busshost.exe"C:\Program Files (x86)\LetsSee!\busshost.exe"2⤵
- Executes dropped EXE
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
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C:\Program Files (x86)\LetsSee!\YTLoader.exe"C:\Program Files (x86)\LetsSee!\YTLoader.exe"2⤵
- Executes dropped EXE
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 4620 -s 16083⤵
- Program crash
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4620 -ip 46201⤵
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
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Downloads
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C:\Program Files (x86)\LetsSee!\YTLoader.exeFilesize
3.0MB
MD5adc9db2753fa3daa6a8156254ba2a5f1
SHA150ff27e2e1c4acc35768b93b73c03f7630027f04
SHA256f8cc40321301d39f03eaa48d42cbbb2e953b694dc13ccf9d986032c621223fde
SHA5125f7fca8da622035f3a83e562d727ccdd842d623ec376f93c75c3218bddd970c34a9efc66a33cfd6e52a398fa2ed090b890d05aecef53f65a22917d50d31a1195
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C:\Program Files (x86)\LetsSee!\YTLoader.exeFilesize
3.0MB
MD5adc9db2753fa3daa6a8156254ba2a5f1
SHA150ff27e2e1c4acc35768b93b73c03f7630027f04
SHA256f8cc40321301d39f03eaa48d42cbbb2e953b694dc13ccf9d986032c621223fde
SHA5125f7fca8da622035f3a83e562d727ccdd842d623ec376f93c75c3218bddd970c34a9efc66a33cfd6e52a398fa2ed090b890d05aecef53f65a22917d50d31a1195
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C:\Program Files (x86)\LetsSee!\busshost.exeFilesize
627KB
MD58073f1d1a37c1b1e45e2529c08cfe43b
SHA12b4c4f2afa5110f56c4501650dd796ab90e04e99
SHA256c878566de0610cb02d485f8d1aba2a4a1afe8ea083446b1509c2a551625dd0f6
SHA512375d9e1afe03d56e1389a7c2674acd7ddd02bd2b54d6371c5771dad7297efe743bed0e71b9db99b454cb477f28fef4b61a4429d2e9a3df5efb7ff47de4990273
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C:\Program Files (x86)\LetsSee!\busshost.exeFilesize
627KB
MD58073f1d1a37c1b1e45e2529c08cfe43b
SHA12b4c4f2afa5110f56c4501650dd796ab90e04e99
SHA256c878566de0610cb02d485f8d1aba2a4a1afe8ea083446b1509c2a551625dd0f6
SHA512375d9e1afe03d56e1389a7c2674acd7ddd02bd2b54d6371c5771dad7297efe743bed0e71b9db99b454cb477f28fef4b61a4429d2e9a3df5efb7ff47de4990273
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memory/4472-147-0x0000000002990000-0x0000000002A90000-memory.dmpFilesize
1024KB
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memory/4472-150-0x0000000000400000-0x0000000000CA3000-memory.dmpFilesize
8.6MB
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memory/4472-149-0x0000000002990000-0x0000000002A90000-memory.dmpFilesize
1024KB
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memory/4472-148-0x0000000000400000-0x0000000000CA3000-memory.dmpFilesize
8.6MB
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memory/4472-131-0x0000000000000000-mapping.dmp
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memory/4620-139-0x0000000004CB0000-0x0000000004CB8000-memory.dmpFilesize
32KB
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memory/4620-141-0x0000000004DF0000-0x0000000004DF8000-memory.dmpFilesize
32KB
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memory/4620-142-0x0000000004E00000-0x0000000004E08000-memory.dmpFilesize
32KB
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memory/4620-143-0x0000000004E20000-0x0000000004E28000-memory.dmpFilesize
32KB
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memory/4620-144-0x0000000004E30000-0x0000000004E38000-memory.dmpFilesize
32KB
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memory/4620-145-0x0000000004E40000-0x0000000004E48000-memory.dmpFilesize
32KB
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memory/4620-140-0x0000000004CD0000-0x0000000004CD8000-memory.dmpFilesize
32KB
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memory/4620-138-0x0000000004CA0000-0x0000000004CAA000-memory.dmpFilesize
40KB
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memory/4620-137-0x00000000000C0000-0x00000000003C8000-memory.dmpFilesize
3.0MB
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memory/4620-134-0x0000000000000000-mapping.dmp