Analysis
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max time kernel
201s -
max time network
224s -
platform
windows10-2004_x64 -
resource
win10v2004-20220414-en -
submitted
25-06-2022 01:44
Static task
static1
Behavioral task
behavioral1
Sample
a59d62e59533961aa25c3c8b035ef568efe89f000e4e6c303e571deea3084371.exe
Resource
win7-20220414-en
General
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Target
a59d62e59533961aa25c3c8b035ef568efe89f000e4e6c303e571deea3084371.exe
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Size
3.6MB
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MD5
a8ad0e6c4cadc3ca2b95ccd00f4c7144
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SHA1
cff385720a074c1f2a250e95e5c544674bc20a0d
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SHA256
a59d62e59533961aa25c3c8b035ef568efe89f000e4e6c303e571deea3084371
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SHA512
c0a3f7f1d69dd1bb11649d9aab1e17c7a385fc97344356cc11898d3c295cc45a918096f730e042e822a57add5bc19141380f827101ae6382ebedafd1fa0a2d3e
Malware Config
Extracted
vidar
9.7
231
http://bestbtcchange.com/
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profile_id
231
Signatures
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Vidar Stealer 1 IoCs
Processes:
resource yara_rule behavioral2/memory/4404-140-0x0000000000400000-0x00000000008B6000-memory.dmp family_vidar -
Executes dropped EXE 2 IoCs
Processes:
busshost.exeYTLoader.exepid process 4404 busshost.exe 4568 YTLoader.exe -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
a59d62e59533961aa25c3c8b035ef568efe89f000e4e6c303e571deea3084371.exedescription ioc process Key value queried \REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\Control Panel\International\Geo\Nation a59d62e59533961aa25c3c8b035ef568efe89f000e4e6c303e571deea3084371.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 34 ip-api.com -
Drops file in Program Files directory 4 IoCs
Processes:
a59d62e59533961aa25c3c8b035ef568efe89f000e4e6c303e571deea3084371.exedescription ioc process File opened for modification C:\Program Files (x86)\LetsSee!\YTLoader.exe a59d62e59533961aa25c3c8b035ef568efe89f000e4e6c303e571deea3084371.exe File opened for modification C:\Program Files (x86)\LetsSee!\busshost.exe a59d62e59533961aa25c3c8b035ef568efe89f000e4e6c303e571deea3084371.exe File opened for modification C:\Program Files (x86)\LetsSee!\Uninstall.exe a59d62e59533961aa25c3c8b035ef568efe89f000e4e6c303e571deea3084371.exe File created C:\Program Files (x86)\LetsSee!\Uninstall.ini a59d62e59533961aa25c3c8b035ef568efe89f000e4e6c303e571deea3084371.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 804 4568 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 4404 busshost.exe 4404 busshost.exe 4404 busshost.exe 4404 busshost.exe 4404 busshost.exe 4404 busshost.exe 4404 busshost.exe 4404 busshost.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
Processes:
YTLoader.exedescription pid process Token: SeDebugPrivilege 4568 YTLoader.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
a59d62e59533961aa25c3c8b035ef568efe89f000e4e6c303e571deea3084371.exedescription pid process target process PID 2036 wrote to memory of 4404 2036 a59d62e59533961aa25c3c8b035ef568efe89f000e4e6c303e571deea3084371.exe busshost.exe PID 2036 wrote to memory of 4404 2036 a59d62e59533961aa25c3c8b035ef568efe89f000e4e6c303e571deea3084371.exe busshost.exe PID 2036 wrote to memory of 4404 2036 a59d62e59533961aa25c3c8b035ef568efe89f000e4e6c303e571deea3084371.exe busshost.exe PID 2036 wrote to memory of 4568 2036 a59d62e59533961aa25c3c8b035ef568efe89f000e4e6c303e571deea3084371.exe YTLoader.exe PID 2036 wrote to memory of 4568 2036 a59d62e59533961aa25c3c8b035ef568efe89f000e4e6c303e571deea3084371.exe YTLoader.exe PID 2036 wrote to memory of 4568 2036 a59d62e59533961aa25c3c8b035ef568efe89f000e4e6c303e571deea3084371.exe YTLoader.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\a59d62e59533961aa25c3c8b035ef568efe89f000e4e6c303e571deea3084371.exe"C:\Users\Admin\AppData\Local\Temp\a59d62e59533961aa25c3c8b035ef568efe89f000e4e6c303e571deea3084371.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 4568 -s 15963⤵
- Program crash
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 200 -p 4568 -ip 45681⤵
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
663KB
MD565787b7381c5404fc99b996e56d1be99
SHA103e6d7842e14e62cf8c47d365ebf5cb29dd2d1f3
SHA2565a308922638cffd906bf3f43452cdb10578f516589ead120d0f8152480f41755
SHA5125d971e574a2de2953fd7e85ed643c3693937973bf3bb0628817aece5d3a14ca543fce287a479d56562dc3bd1c29b10fdc7a29c0cd6d4ed1d19670b161efb113b
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C:\Program Files (x86)\LetsSee!\busshost.exeFilesize
663KB
MD565787b7381c5404fc99b996e56d1be99
SHA103e6d7842e14e62cf8c47d365ebf5cb29dd2d1f3
SHA2565a308922638cffd906bf3f43452cdb10578f516589ead120d0f8152480f41755
SHA5125d971e574a2de2953fd7e85ed643c3693937973bf3bb0628817aece5d3a14ca543fce287a479d56562dc3bd1c29b10fdc7a29c0cd6d4ed1d19670b161efb113b
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memory/4404-139-0x00000000025A0000-0x00000000026A0000-memory.dmpFilesize
1024KB
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memory/4404-130-0x0000000000000000-mapping.dmp
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memory/4404-140-0x0000000000400000-0x00000000008B6000-memory.dmpFilesize
4.7MB
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memory/4404-138-0x00000000025A0000-0x00000000026A0000-memory.dmpFilesize
1024KB
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memory/4568-142-0x00000000054E0000-0x00000000054E8000-memory.dmpFilesize
32KB
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memory/4568-136-0x00000000007B0000-0x0000000000AB8000-memory.dmpFilesize
3.0MB
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memory/4568-141-0x00000000054D0000-0x00000000054DA000-memory.dmpFilesize
40KB
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memory/4568-133-0x0000000000000000-mapping.dmp
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memory/4568-143-0x0000000005D10000-0x0000000005D18000-memory.dmpFilesize
32KB
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memory/4568-144-0x0000000005D20000-0x0000000005D28000-memory.dmpFilesize
32KB
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memory/4568-145-0x0000000005D30000-0x0000000005D38000-memory.dmpFilesize
32KB
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memory/4568-146-0x0000000005D50000-0x0000000005D58000-memory.dmpFilesize
32KB
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memory/4568-147-0x0000000005D60000-0x0000000005D68000-memory.dmpFilesize
32KB
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memory/4568-148-0x0000000005D70000-0x0000000005D78000-memory.dmpFilesize
32KB