Analysis
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max time kernel
50s -
max time network
139s -
platform
windows10-2004_x64 -
resource
win10v2004-20220812-en -
resource tags
arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system -
submitted
11-11-2022 10:18
Static task
static1
Behavioral task
behavioral1
Sample
Set_Yuki_x64.exe
Resource
win7-20220812-en
General
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Target
Set_Yuki_x64.exe
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Size
1.4MB
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MD5
d9534d31fd38538d6e5d00b03f75ad7d
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SHA1
94f3388a8b56b86eb27d9fda2e218d9341e5c8e5
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SHA256
0fe6217f7e3e574b93ebcaa46e3271f944e3c8a30f4996f84d77ab67bfa5406e
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SHA512
8da827c837aad1fcf47822872de8461ccc37d7caea4980df11d1910d7ee1889802a83acaf4bd632702335abd1a591a2cf7515e1fbe9fe22c1f74ba37e5b42423
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SSDEEP
24576:uv66t3q/zhIYCpnviF18f5xn/T8BlnpvgSHhD:JsqlRuxn/T8j6s
Malware Config
Extracted
vidar
55.6
1325
https://t.me/seclab_new
https://koyu.space/@ofade
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profile_id
1325
Signatures
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Downloads MZ/PE file
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Executes dropped EXE 1 IoCs
Processes:
97250264537536847509.exepid process 5100 97250264537536847509.exe -
Processes:
resource yara_rule C:\ProgramData\97250264537536847509.exe upx C:\ProgramData\97250264537536847509.exe upx behavioral2/memory/5100-159-0x0000000000E30000-0x000000000161B000-memory.dmp upx behavioral2/memory/5100-160-0x0000000000E30000-0x000000000161B000-memory.dmp upx -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
Set_Yuki_x64.exedescription ioc process Key value queried \REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation Set_Yuki_x64.exe -
Loads dropped DLL 2 IoCs
Processes:
Set_Yuki_x64.exepid process 544 Set_Yuki_x64.exe 544 Set_Yuki_x64.exe -
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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Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
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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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Legitimate hosting services abused for malware hosting/C2 1 TTPs
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Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Checks processor information in registry 2 TTPs 2 IoCs
Processor information is often read in order to detect sandboxing environments.
Processes:
Set_Yuki_x64.exedescription ioc process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString Set_Yuki_x64.exe Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 Set_Yuki_x64.exe -
Delays execution with timeout.exe 1 IoCs
Processes:
timeout.exepid process 3884 timeout.exe -
GoLang User-Agent 1 IoCs
Uses default user-agent string defined by GoLang HTTP packages.
Processes:
description flow ioc HTTP User-Agent header 63 Go-http-client/1.1 -
Suspicious behavior: EnumeratesProcesses 2 IoCs
Processes:
Set_Yuki_x64.exepid process 544 Set_Yuki_x64.exe 544 Set_Yuki_x64.exe -
Suspicious use of WriteProcessMemory 8 IoCs
Processes:
Set_Yuki_x64.execmd.exedescription pid process target process PID 544 wrote to memory of 5100 544 Set_Yuki_x64.exe 97250264537536847509.exe PID 544 wrote to memory of 5100 544 Set_Yuki_x64.exe 97250264537536847509.exe PID 544 wrote to memory of 1876 544 Set_Yuki_x64.exe cmd.exe PID 544 wrote to memory of 1876 544 Set_Yuki_x64.exe cmd.exe PID 544 wrote to memory of 1876 544 Set_Yuki_x64.exe cmd.exe PID 1876 wrote to memory of 3884 1876 cmd.exe timeout.exe PID 1876 wrote to memory of 3884 1876 cmd.exe timeout.exe PID 1876 wrote to memory of 3884 1876 cmd.exe timeout.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\Set_Yuki_x64.exe"C:\Users\Admin\AppData\Local\Temp\Set_Yuki_x64.exe"1⤵
- Checks computer location settings
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\ProgramData\97250264537536847509.exe"C:\ProgramData\97250264537536847509.exe"2⤵
- Executes dropped EXE
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c timeout /t 6 & del /f /q "C:\Users\Admin\AppData\Local\Temp\Set_Yuki_x64.exe" & exit2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\timeout.exetimeout /t 63⤵
- Delays execution with timeout.exe
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
Loading Replay Monitor...
Downloads
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C:\ProgramData\97250264537536847509.exeFilesize
2.8MB
MD54a123c0fa6f2d458997a8d92d6ace7ae
SHA1dc83bde87f0af8412c0784abf4a89ee4ad873427
SHA2562d360d6c5d5036729a10bb2221630f380cad96e9f7c78b257e086cb26d975a44
SHA51267c655625d319e3626735dfe6c6b1241fbdcd44b7da3d9342ff1f876c08ab8c9314adae08c403a15d55a71cc0d10c0c05f5b345bcba491325f6799615ef55f35
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C:\ProgramData\97250264537536847509.exeFilesize
2.8MB
MD54a123c0fa6f2d458997a8d92d6ace7ae
SHA1dc83bde87f0af8412c0784abf4a89ee4ad873427
SHA2562d360d6c5d5036729a10bb2221630f380cad96e9f7c78b257e086cb26d975a44
SHA51267c655625d319e3626735dfe6c6b1241fbdcd44b7da3d9342ff1f876c08ab8c9314adae08c403a15d55a71cc0d10c0c05f5b345bcba491325f6799615ef55f35
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C:\ProgramData\mozglue.dllFilesize
593KB
MD5c8fd9be83bc728cc04beffafc2907fe9
SHA195ab9f701e0024cedfbd312bcfe4e726744c4f2e
SHA256ba06a6ee0b15f5be5c4e67782eec8b521e36c107a329093ec400fe0404eb196a
SHA512fbb446f4a27ef510e616caad52945d6c9cc1fd063812c41947e579ec2b54df57c6dc46237ded80fca5847f38cbe1747a6c66a13e2c8c19c664a72be35eb8b040
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C:\ProgramData\nss3.dllFilesize
2.0MB
MD51cc453cdf74f31e4d913ff9c10acdde2
SHA16e85eae544d6e965f15fa5c39700fa7202f3aafe
SHA256ac5c92fe6c51cfa742e475215b83b3e11a4379820043263bf50d4068686c6fa5
SHA512dd9ff4e06b00dc831439bab11c10e9b2ae864ea6e780d3835ea7468818f35439f352ef137da111efcdf2bb6465f6ca486719451bf6cf32c6a4420a56b1d64571
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memory/544-132-0x0000000001370000-0x00000000013D0000-memory.dmpFilesize
384KB
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memory/544-136-0x0000000061E00000-0x0000000061EF3000-memory.dmpFilesize
972KB
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memory/1876-161-0x0000000000000000-mapping.dmp
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memory/3884-162-0x0000000000000000-mapping.dmp
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memory/5100-156-0x0000000000000000-mapping.dmp
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memory/5100-159-0x0000000000E30000-0x000000000161B000-memory.dmpFilesize
7.9MB
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memory/5100-160-0x0000000000E30000-0x000000000161B000-memory.dmpFilesize
7.9MB