Analysis
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max time kernel
119s -
max time network
145s -
platform
windows10-2004_x64 -
resource
win10v2004-20220721-en -
resource tags
arch:x64arch:x86image:win10v2004-20220721-enlocale:en-usos:windows10-2004-x64system -
submitted
24-07-2022 17:34
Static task
static1
Behavioral task
behavioral1
Sample
a4983faa6bc1743bd7607fc5f8204694e6852af052a2bb8db7af6e24fe71267a.exe
Resource
win7-20220718-en
General
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Target
a4983faa6bc1743bd7607fc5f8204694e6852af052a2bb8db7af6e24fe71267a.exe
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Size
4.3MB
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MD5
c8659d50dd2e24fb509377114355aa36
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SHA1
0a3d5ba3e3cb94c89c2007c68ba11ba97674c67a
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SHA256
a4983faa6bc1743bd7607fc5f8204694e6852af052a2bb8db7af6e24fe71267a
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SHA512
3ff3d3aee31f76f3bee725740b803331439602b92791e6aea5f62dcf112689caab262f4a8d7bee45c0f70ff4ccc6d29a24802d8705e8032c17fd26a54a790d5a
Malware Config
Extracted
vidar
9.9
231
http://rapidbtcinvest.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/4064-155-0x0000000000400000-0x0000000000538000-memory.dmp family_vidar behavioral2/memory/4064-166-0x0000000000400000-0x0000000000538000-memory.dmp family_vidar -
Executes dropped EXE 4 IoCs
Processes:
busshost.exeYTLoader.execonf.exeattachmentphoto.exepid process 4064 busshost.exe 688 YTLoader.exe 4060 conf.exe 4584 attachmentphoto.exe -
Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
a4983faa6bc1743bd7607fc5f8204694e6852af052a2bb8db7af6e24fe71267a.execonf.exedescription ioc process Key value queried \REGISTRY\USER\S-1-5-21-1101907861-274115917-2188613224-1000\Control Panel\International\Geo\Nation a4983faa6bc1743bd7607fc5f8204694e6852af052a2bb8db7af6e24fe71267a.exe Key value queried \REGISTRY\USER\S-1-5-21-1101907861-274115917-2188613224-1000\Control Panel\International\Geo\Nation conf.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 11 ip-api.com -
AutoIT Executable 3 IoCs
AutoIT scripts compiled to PE executables.
Processes:
resource yara_rule behavioral2/memory/4060-153-0x0000000000400000-0x0000000000595000-memory.dmp autoit_exe behavioral2/memory/4584-159-0x0000000000400000-0x0000000000595000-memory.dmp autoit_exe behavioral2/memory/4584-167-0x0000000000400000-0x0000000000595000-memory.dmp autoit_exe -
Drops file in Program Files directory 5 IoCs
Processes:
a4983faa6bc1743bd7607fc5f8204694e6852af052a2bb8db7af6e24fe71267a.exedescription ioc process File opened for modification C:\Program Files (x86)\LetsSee!\conf.exe a4983faa6bc1743bd7607fc5f8204694e6852af052a2bb8db7af6e24fe71267a.exe File opened for modification C:\Program Files (x86)\LetsSee!\Uninstall.exe a4983faa6bc1743bd7607fc5f8204694e6852af052a2bb8db7af6e24fe71267a.exe File created C:\Program Files (x86)\LetsSee!\Uninstall.ini a4983faa6bc1743bd7607fc5f8204694e6852af052a2bb8db7af6e24fe71267a.exe File opened for modification C:\Program Files (x86)\LetsSee!\YTLoader.exe a4983faa6bc1743bd7607fc5f8204694e6852af052a2bb8db7af6e24fe71267a.exe File opened for modification C:\Program Files (x86)\LetsSee!\busshost.exe a4983faa6bc1743bd7607fc5f8204694e6852af052a2bb8db7af6e24fe71267a.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 2 IoCs
Processes:
WerFault.exeWerFault.exepid pid_target process target process 1452 688 WerFault.exe YTLoader.exe 2304 4060 WerFault.exe conf.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 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 Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 busshost.exe -
Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
Processes:
schtasks.exeschtasks.exepid process 4732 schtasks.exe 4824 schtasks.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 -
Runs ping.exe 1 TTPs 1 IoCs
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Suspicious behavior: EnumeratesProcesses 8 IoCs
Processes:
busshost.exepid process 4064 busshost.exe 4064 busshost.exe 4064 busshost.exe 4064 busshost.exe 4064 busshost.exe 4064 busshost.exe 4064 busshost.exe 4064 busshost.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
Processes:
YTLoader.exedescription pid process Token: SeDebugPrivilege 688 YTLoader.exe -
Suspicious use of WriteProcessMemory 30 IoCs
Processes:
a4983faa6bc1743bd7607fc5f8204694e6852af052a2bb8db7af6e24fe71267a.execonf.execmd.exeattachmentphoto.execmd.execmd.exedescription pid process target process PID 4168 wrote to memory of 4064 4168 a4983faa6bc1743bd7607fc5f8204694e6852af052a2bb8db7af6e24fe71267a.exe busshost.exe PID 4168 wrote to memory of 4064 4168 a4983faa6bc1743bd7607fc5f8204694e6852af052a2bb8db7af6e24fe71267a.exe busshost.exe PID 4168 wrote to memory of 4064 4168 a4983faa6bc1743bd7607fc5f8204694e6852af052a2bb8db7af6e24fe71267a.exe busshost.exe PID 4168 wrote to memory of 688 4168 a4983faa6bc1743bd7607fc5f8204694e6852af052a2bb8db7af6e24fe71267a.exe YTLoader.exe PID 4168 wrote to memory of 688 4168 a4983faa6bc1743bd7607fc5f8204694e6852af052a2bb8db7af6e24fe71267a.exe YTLoader.exe PID 4168 wrote to memory of 688 4168 a4983faa6bc1743bd7607fc5f8204694e6852af052a2bb8db7af6e24fe71267a.exe YTLoader.exe PID 4168 wrote to memory of 4060 4168 a4983faa6bc1743bd7607fc5f8204694e6852af052a2bb8db7af6e24fe71267a.exe conf.exe PID 4168 wrote to memory of 4060 4168 a4983faa6bc1743bd7607fc5f8204694e6852af052a2bb8db7af6e24fe71267a.exe conf.exe PID 4168 wrote to memory of 4060 4168 a4983faa6bc1743bd7607fc5f8204694e6852af052a2bb8db7af6e24fe71267a.exe conf.exe PID 4060 wrote to memory of 4584 4060 conf.exe attachmentphoto.exe PID 4060 wrote to memory of 4584 4060 conf.exe attachmentphoto.exe PID 4060 wrote to memory of 4584 4060 conf.exe attachmentphoto.exe PID 4060 wrote to memory of 3960 4060 conf.exe cmd.exe PID 4060 wrote to memory of 3960 4060 conf.exe cmd.exe PID 4060 wrote to memory of 3960 4060 conf.exe cmd.exe PID 3960 wrote to memory of 4932 3960 cmd.exe PING.EXE PID 3960 wrote to memory of 4932 3960 cmd.exe PING.EXE PID 3960 wrote to memory of 4932 3960 cmd.exe PING.EXE PID 4584 wrote to memory of 980 4584 attachmentphoto.exe cmd.exe PID 4584 wrote to memory of 980 4584 attachmentphoto.exe cmd.exe PID 4584 wrote to memory of 980 4584 attachmentphoto.exe cmd.exe PID 4584 wrote to memory of 4288 4584 attachmentphoto.exe cmd.exe PID 4584 wrote to memory of 4288 4584 attachmentphoto.exe cmd.exe PID 4584 wrote to memory of 4288 4584 attachmentphoto.exe cmd.exe PID 980 wrote to memory of 4824 980 cmd.exe schtasks.exe PID 980 wrote to memory of 4824 980 cmd.exe schtasks.exe PID 980 wrote to memory of 4824 980 cmd.exe schtasks.exe PID 4288 wrote to memory of 4732 4288 cmd.exe schtasks.exe PID 4288 wrote to memory of 4732 4288 cmd.exe schtasks.exe PID 4288 wrote to memory of 4732 4288 cmd.exe schtasks.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\a4983faa6bc1743bd7607fc5f8204694e6852af052a2bb8db7af6e24fe71267a.exe"C:\Users\Admin\AppData\Local\Temp\a4983faa6bc1743bd7607fc5f8204694e6852af052a2bb8db7af6e24fe71267a.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 688 -s 16083⤵
- Program crash
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C:\Program Files (x86)\LetsSee!\conf.exe"C:\Program Files (x86)\LetsSee!\conf.exe"2⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\Microsoft\SystemCertificates\My\CTLs\7ZipArchiver\attachmentphoto.exeC:\Users\Admin\AppData\Roaming\Microsoft\SystemCertificates\My\CTLs\7ZipArchiver\attachmentphoto.exe3⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.exeC:\Windows\system32\cmd.exe /c SchTasks /create /SC MINUTE /TN 7ZipUnis /TR C:\Users\Admin\AppData\Roaming\Microsoft\SystemCertificates\My\CTLs\7ZipArchiver\volumfix.exe4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\schtasks.exeSchTasks /create /SC MINUTE /TN 7ZipUnis /TR C:\Users\Admin\AppData\Roaming\Microsoft\SystemCertificates\My\CTLs\7ZipArchiver\volumfix.exe5⤵
- Creates scheduled task(s)
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C:\Windows\SysWOW64\cmd.exeC:\Windows\system32\cmd.exe /c SchTasks /create /SC HOURLY /TN FlashServis /TR C:\ProgramData\FlashSys\CurlMSI.exe4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\schtasks.exeSchTasks /create /SC HOURLY /TN FlashServis /TR C:\ProgramData\FlashSys\CurlMSI.exe5⤵
- Creates scheduled task(s)
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /k ping -n 2 localhost < nul & del /F /Q "C:\Program Files (x86)\LetsSee!\conf.exe"3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\PING.EXEping -n 2 localhost4⤵
- Runs ping.exe
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 4060 -s 10043⤵
- Program crash
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 688 -ip 6881⤵
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 4060 -ip 40601⤵
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
Loading Replay Monitor...
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
914KB
MD5658e674811ebff49dd8ff5b2e5fc03d3
SHA1fe08e682ea246fb054afa1d5b4c81276d39b77a1
SHA256e929aba5f2630f537cc5c9d4067556aa426d9974ee48722de5b0217e16aeb3ed
SHA51230e09260bc878487c19f7b539603b11eeb4132786485077ddda84a423b8445a5971ac7bde761a4c9464b218fa058442d27f5f740ee8c8660f88273aa12e8b2e7
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C:\Program Files (x86)\LetsSee!\busshost.exeFilesize
914KB
MD5658e674811ebff49dd8ff5b2e5fc03d3
SHA1fe08e682ea246fb054afa1d5b4c81276d39b77a1
SHA256e929aba5f2630f537cc5c9d4067556aa426d9974ee48722de5b0217e16aeb3ed
SHA51230e09260bc878487c19f7b539603b11eeb4132786485077ddda84a423b8445a5971ac7bde761a4c9464b218fa058442d27f5f740ee8c8660f88273aa12e8b2e7
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C:\Program Files (x86)\LetsSee!\conf.exeFilesize
1.3MB
MD56aa46c5f2770d99294bbb45dfb79bf22
SHA106b16891d85dba6f5e761bf1c82f10cf54438495
SHA2563a81ec0e539c4f9ad5bbc7c31ec3996f88ca97f234fe0cf7a36d64fa645002ad
SHA5127f1ca4dd1ea15435950170e16c103761cc71ad38bf1075e2696aa3e2bae1a1668f7d107c3e4a24407631153351605397ff11ce6a057d9bb752c9af56b852c515
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C:\Program Files (x86)\LetsSee!\conf.exeFilesize
1.3MB
MD56aa46c5f2770d99294bbb45dfb79bf22
SHA106b16891d85dba6f5e761bf1c82f10cf54438495
SHA2563a81ec0e539c4f9ad5bbc7c31ec3996f88ca97f234fe0cf7a36d64fa645002ad
SHA5127f1ca4dd1ea15435950170e16c103761cc71ad38bf1075e2696aa3e2bae1a1668f7d107c3e4a24407631153351605397ff11ce6a057d9bb752c9af56b852c515
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C:\Users\Admin\AppData\Roaming\Microsoft\Protect\win.iniFilesize
199B
MD53d68da5fd157231843a13667676de3f2
SHA1206082eb56a40f38ba1e852ffcde4cd6e23cc338
SHA256f5c9d294b9c805e38bebe17ac7150bf591df5b28f28db56dc2a1a9e609331759
SHA512e136ed0cc3f47c52b439d72d39fcde3724852ec106e145c5e0dbb6d4d6e69209da7d160e3cc7c7ad51370230ffd4403477a65cd334cf71965473b847db0584a5
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C:\Users\Admin\AppData\Roaming\Microsoft\SystemCertificates\My\CTLs\7ZipArchiver\attachmentphoto.exeFilesize
1.3MB
MD56aa46c5f2770d99294bbb45dfb79bf22
SHA106b16891d85dba6f5e761bf1c82f10cf54438495
SHA2563a81ec0e539c4f9ad5bbc7c31ec3996f88ca97f234fe0cf7a36d64fa645002ad
SHA5127f1ca4dd1ea15435950170e16c103761cc71ad38bf1075e2696aa3e2bae1a1668f7d107c3e4a24407631153351605397ff11ce6a057d9bb752c9af56b852c515
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C:\Users\Admin\AppData\Roaming\Microsoft\SystemCertificates\My\CTLs\7ZipArchiver\attachmentphoto.exeFilesize
1.3MB
MD56aa46c5f2770d99294bbb45dfb79bf22
SHA106b16891d85dba6f5e761bf1c82f10cf54438495
SHA2563a81ec0e539c4f9ad5bbc7c31ec3996f88ca97f234fe0cf7a36d64fa645002ad
SHA5127f1ca4dd1ea15435950170e16c103761cc71ad38bf1075e2696aa3e2bae1a1668f7d107c3e4a24407631153351605397ff11ce6a057d9bb752c9af56b852c515
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memory/688-140-0x0000000005420000-0x0000000005428000-memory.dmpFilesize
32KB
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memory/688-139-0x0000000005410000-0x000000000541A000-memory.dmpFilesize
40KB
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memory/688-141-0x0000000005440000-0x0000000005448000-memory.dmpFilesize
32KB
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memory/688-142-0x0000000005450000-0x0000000005458000-memory.dmpFilesize
32KB
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memory/688-143-0x0000000005460000-0x0000000005468000-memory.dmpFilesize
32KB
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memory/688-144-0x0000000005480000-0x0000000005488000-memory.dmpFilesize
32KB
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memory/688-145-0x0000000005490000-0x0000000005498000-memory.dmpFilesize
32KB
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memory/688-146-0x00000000054A0000-0x00000000054A8000-memory.dmpFilesize
32KB
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memory/688-133-0x0000000000000000-mapping.dmp
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memory/688-138-0x00000000005E0000-0x00000000008E8000-memory.dmpFilesize
3.0MB
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memory/980-161-0x0000000000000000-mapping.dmp
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memory/3960-151-0x0000000000000000-mapping.dmp
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memory/4060-153-0x0000000000400000-0x0000000000595000-memory.dmpFilesize
1.6MB
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memory/4060-136-0x0000000000000000-mapping.dmp
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memory/4060-152-0x0000000002399000-0x000000000242D000-memory.dmpFilesize
592KB
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memory/4064-130-0x0000000000000000-mapping.dmp
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memory/4064-154-0x0000000002300000-0x0000000002400000-memory.dmpFilesize
1024KB
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memory/4064-155-0x0000000000400000-0x0000000000538000-memory.dmpFilesize
1.2MB
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memory/4064-166-0x0000000000400000-0x0000000000538000-memory.dmpFilesize
1.2MB
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memory/4064-165-0x0000000002300000-0x0000000002400000-memory.dmpFilesize
1024KB
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memory/4288-162-0x0000000000000000-mapping.dmp
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memory/4584-159-0x0000000000400000-0x0000000000595000-memory.dmpFilesize
1.6MB
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memory/4584-149-0x0000000000000000-mapping.dmp
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memory/4584-158-0x0000000002293000-0x0000000002327000-memory.dmpFilesize
592KB
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memory/4584-167-0x0000000000400000-0x0000000000595000-memory.dmpFilesize
1.6MB
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memory/4732-164-0x0000000000000000-mapping.dmp
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memory/4824-163-0x0000000000000000-mapping.dmp
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memory/4932-156-0x0000000000000000-mapping.dmp