Analysis
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max time kernel
102s -
max time network
155s -
platform
windows10-2004_x64 -
resource
win10v2004-20220414-en -
submitted
20-06-2022 03:38
Static task
static1
Behavioral task
behavioral1
Sample
331f760f2f6e906e967e9c847b4cdf2ebcd7ba1e40f1a159829eaec89df4e847.exe
Resource
win7-20220414-en
General
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Target
331f760f2f6e906e967e9c847b4cdf2ebcd7ba1e40f1a159829eaec89df4e847.exe
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Size
3.6MB
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MD5
be8db6a439bce7655fe2a49a7234276f
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SHA1
2d263aed2cb76c7fe79e10ecbfd5207acca2daf2
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SHA256
331f760f2f6e906e967e9c847b4cdf2ebcd7ba1e40f1a159829eaec89df4e847
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SHA512
02629a51fc05724e1b28fd8598e82b891df2f244a3acb01c3f2ed273d98738bb954ad0b92b9b9282d3262afa280fe2afb57592b2dce6ec905c3ff6c66148820d
Malware Config
Extracted
vidar
9.5
231
http://bestpolandhotels.com/
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profile_id
231
Signatures
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suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer HTTP POST Pattern
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer HTTP POST Pattern
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Vidar Stealer 2 IoCs
Processes:
resource yara_rule behavioral2/memory/2244-139-0x0000000000400000-0x00000000004EB000-memory.dmp family_vidar behavioral2/memory/2244-149-0x0000000000400000-0x00000000004EB000-memory.dmp family_vidar -
Executes dropped EXE 2 IoCs
Processes:
busshost.exeYTLoader.exepid process 2244 busshost.exe 1428 YTLoader.exe -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
331f760f2f6e906e967e9c847b4cdf2ebcd7ba1e40f1a159829eaec89df4e847.exedescription ioc process Key value queried \REGISTRY\USER\S-1-5-21-1081944012-3634099177-1681222835-1000\Control Panel\International\Geo\Nation 331f760f2f6e906e967e9c847b4cdf2ebcd7ba1e40f1a159829eaec89df4e847.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 10 ip-api.com -
Drops file in Program Files directory 4 IoCs
Processes:
331f760f2f6e906e967e9c847b4cdf2ebcd7ba1e40f1a159829eaec89df4e847.exedescription ioc process File opened for modification C:\Program Files (x86)\LetsSee!\busshost.exe 331f760f2f6e906e967e9c847b4cdf2ebcd7ba1e40f1a159829eaec89df4e847.exe File opened for modification C:\Program Files (x86)\LetsSee!\Uninstall.exe 331f760f2f6e906e967e9c847b4cdf2ebcd7ba1e40f1a159829eaec89df4e847.exe File created C:\Program Files (x86)\LetsSee!\Uninstall.ini 331f760f2f6e906e967e9c847b4cdf2ebcd7ba1e40f1a159829eaec89df4e847.exe File opened for modification C:\Program Files (x86)\LetsSee!\YTLoader.exe 331f760f2f6e906e967e9c847b4cdf2ebcd7ba1e40f1a159829eaec89df4e847.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 992 1428 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:
busshost.exeYTLoader.exedescription ioc process Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 busshost.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString busshost.exe Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 YTLoader.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString YTLoader.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 2244 busshost.exe 2244 busshost.exe 2244 busshost.exe 2244 busshost.exe 2244 busshost.exe 2244 busshost.exe 2244 busshost.exe 2244 busshost.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
Processes:
YTLoader.exedescription pid process Token: SeDebugPrivilege 1428 YTLoader.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
331f760f2f6e906e967e9c847b4cdf2ebcd7ba1e40f1a159829eaec89df4e847.exedescription pid process target process PID 908 wrote to memory of 2244 908 331f760f2f6e906e967e9c847b4cdf2ebcd7ba1e40f1a159829eaec89df4e847.exe busshost.exe PID 908 wrote to memory of 2244 908 331f760f2f6e906e967e9c847b4cdf2ebcd7ba1e40f1a159829eaec89df4e847.exe busshost.exe PID 908 wrote to memory of 2244 908 331f760f2f6e906e967e9c847b4cdf2ebcd7ba1e40f1a159829eaec89df4e847.exe busshost.exe PID 908 wrote to memory of 1428 908 331f760f2f6e906e967e9c847b4cdf2ebcd7ba1e40f1a159829eaec89df4e847.exe YTLoader.exe PID 908 wrote to memory of 1428 908 331f760f2f6e906e967e9c847b4cdf2ebcd7ba1e40f1a159829eaec89df4e847.exe YTLoader.exe PID 908 wrote to memory of 1428 908 331f760f2f6e906e967e9c847b4cdf2ebcd7ba1e40f1a159829eaec89df4e847.exe YTLoader.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\331f760f2f6e906e967e9c847b4cdf2ebcd7ba1e40f1a159829eaec89df4e847.exe"C:\Users\Admin\AppData\Local\Temp\331f760f2f6e906e967e9c847b4cdf2ebcd7ba1e40f1a159829eaec89df4e847.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 1428 -s 16123⤵
- Program crash
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 1428 -ip 14281⤵
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
633KB
MD5ccd0080b37baf64eff7c096e3aa83c33
SHA16f2e8df5507f032e6e1e92f601f1fdeb31e29a4e
SHA2568d54520e74ca412c17f1b124f6e83348b6365b57d11afc030af40f29c2ecff3d
SHA5122bc52be7788f6c64053f2193e91524b0b5883b4a25192d5ab53ce56b12e8e19b222be284fce6d52ae3d6849e512c636e7b14456fba56a34f8b3196fa2248f8b9
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C:\Program Files (x86)\LetsSee!\busshost.exeFilesize
633KB
MD5ccd0080b37baf64eff7c096e3aa83c33
SHA16f2e8df5507f032e6e1e92f601f1fdeb31e29a4e
SHA2568d54520e74ca412c17f1b124f6e83348b6365b57d11afc030af40f29c2ecff3d
SHA5122bc52be7788f6c64053f2193e91524b0b5883b4a25192d5ab53ce56b12e8e19b222be284fce6d52ae3d6849e512c636e7b14456fba56a34f8b3196fa2248f8b9
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memory/1428-143-0x00000000054E0000-0x00000000054E8000-memory.dmpFilesize
32KB
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memory/1428-145-0x0000000005510000-0x0000000005518000-memory.dmpFilesize
32KB
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memory/1428-137-0x0000000000670000-0x0000000000978000-memory.dmpFilesize
3.0MB
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memory/1428-147-0x0000000005530000-0x0000000005538000-memory.dmpFilesize
32KB
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memory/1428-146-0x0000000005520000-0x0000000005528000-memory.dmpFilesize
32KB
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memory/1428-140-0x00000000054A0000-0x00000000054AA000-memory.dmpFilesize
40KB
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memory/1428-141-0x00000000054B0000-0x00000000054B8000-memory.dmpFilesize
32KB
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memory/1428-142-0x00000000054D0000-0x00000000054D8000-memory.dmpFilesize
32KB
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memory/1428-133-0x0000000000000000-mapping.dmp
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memory/1428-144-0x00000000054F0000-0x00000000054F8000-memory.dmpFilesize
32KB
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memory/2244-130-0x0000000000000000-mapping.dmp
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memory/2244-139-0x0000000000400000-0x00000000004EB000-memory.dmpFilesize
940KB
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memory/2244-138-0x0000000002160000-0x0000000002260000-memory.dmpFilesize
1024KB
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memory/2244-148-0x0000000002160000-0x0000000002260000-memory.dmpFilesize
1024KB
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memory/2244-149-0x0000000000400000-0x00000000004EB000-memory.dmpFilesize
940KB