Analysis
- user interaction
yes - max time kernel
60s - max time network
61s - platform
windows10-2004_x64 - resource
win10v2004-20260911-en - resource tags
arch:x64arch:x86image:win10v2004-20260911-enlocale:en-usos:windows10-2004-x64systemwindows - submitted
11/11/2026, 06:35
Behavioral task
behavioral1
Sample
ko66 final.exe
Resource
win10v2004-20260911-en
Behavioral task
behavioral2
Sample
ko66 final.exe
Resource
win10ltsc2021-20260911-en
Behavioral task
behavioral3
Sample
ko66 final.exe
Resource
win11-20260911-en
Behavioral task
behavioral4
Sample
ko66 final.exe
Resource
win11ltsc2024-20260911-en
General
- Target ko66 final.exe
- Size 3.1MB
- Sample261111-hca9csfa98
- SHA256 79f9ea4763751f7a7613fd8fd2c72a8834c8f1a7cda2984ef18c0705ba79a074
- MD5 3a7b8faf5b40f4347aad80abd6038006
- SHA1 6705fd0f6634d69c87582c6e34077a458e196ad0
- SHA512 792c6f57ddc2da4aca851ec12d0dc6f49018dc3c9323173b01db79fa1928faabd60a24cb6e9fbb2d3af0513ed3c815d53a9cb8a65e1d9077353193ed768c13ac
- SSDEEP 98304:3v8o2QSaNpzyPllgamYCZof/JKraJJ6z:f5Ofa
- TLSH T1A4E56B143BF85E27E1BBE27795B0041267F0FC1AB363EB0B6581677E1C53B5098426A7
- MD5 SHA1 SHA512 SSDEEP TLSH
Malware Config
Extracted
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quasar
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1.4.1
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OK365 Client
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ko66.asia:8080
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api.ko66.asia:8080
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app.ko66.asia:8080
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www.ko66.asia:8080
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c2.ko66.asia:8080
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malware.ko66.asia:8080
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backdoor.ko66.asia:8080
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3cb6f7ce-f521-4677-b078-01e1d892b28d
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encryption_key
71514463CA895B84E7E6B4A4FC68A8243476E095
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install_name
Client.exe
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key_salt
bfeb1e56fbcd973bb219022430a57843003d5644d21e62b9d4f180e7e6c33941
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log_directory
Logs
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reconnect_delay
100
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startup_key
dkmm
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subdirectory
SubDir
Signatures
- Quasar payload 2 IoCs
resource yara_rule behavioral1/memory/4628-0-0x0000000000930000-0x0000000000C54000-memory.dmp family_quasar behavioral1/files/0x000700000002451a-5.dat family_quasar - Checks computer location settings 2 TTPs 5 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-1846164713-4096795028-774071693-1000\Control Panel\International\Geo\Nation Client.exe Key value queried \REGISTRY\USER\S-1-5-21-1846164713-4096795028-774071693-1000\Control Panel\International\Geo\Nation Client.exe Key value queried \REGISTRY\USER\S-1-5-21-1846164713-4096795028-774071693-1000\Control Panel\International\Geo\Nation Client.exe Key value queried \REGISTRY\USER\S-1-5-21-1846164713-4096795028-774071693-1000\Control Panel\International\Geo\Nation Client.exe Key value queried \REGISTRY\USER\S-1-5-21-1846164713-4096795028-774071693-1000\Control Panel\International\Geo\Nation Client.exe - Executes dropped EXE 7 IoCs
pid Process 812 Client.exe 2336 Client.exe 1412 Client.exe 2596 Client.exe 4608 Client.exe 2768 Client.exe 4152 Client.exe - Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Executes a command shell one-liner 1 TTPs 5 IoCs
Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.
pid Process 3896 cmd.exe 3932 cmd.exe 892 cmd.exe 3332 cmd.exe 4776 cmd.exe - Reads the TCP/IP host and domain name from the registry 1 TTPs 12 IoCs
The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.
description ioc Process Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain Client.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname Client.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain Client.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname Client.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname Client.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain Client.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname Client.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain Client.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname Client.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain Client.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname Client.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain Client.exe - System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 5 IoCs
Adversaries may check for Internet connectivity on compromised systems.
pid Process 2392 PING.EXE 4412 PING.EXE 2160 PING.EXE 2696 PING.EXE 2580 PING.EXE - Runs ping.exe 1 TTPs 5 IoCs
pid Process 2160 PING.EXE 2696 PING.EXE 2580 PING.EXE 2392 PING.EXE 4412 PING.EXE - Scheduled Task/Job: Scheduled Task 1 TTPs 7 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 5064 schtasks.exe 2240 schtasks.exe 2400 schtasks.exe 2556 schtasks.exe 2664 schtasks.exe 408 schtasks.exe 4832 schtasks.exe - Suspicious use of AdjustPrivilegeToken 8 IoCs
description pid Process Token: SeDebugPrivilege 4628 ko66 final.exe Token: SeDebugPrivilege 812 Client.exe Token: SeDebugPrivilege 2336 Client.exe Token: SeDebugPrivilege 1412 Client.exe Token: SeDebugPrivilege 2596 Client.exe Token: SeDebugPrivilege 4608 Client.exe Token: SeDebugPrivilege 2768 Client.exe Token: SeDebugPrivilege 4152 Client.exe - Suspicious use of SetWindowsHookEx 6 IoCs
pid Process 812 Client.exe 1412 Client.exe 2596 Client.exe 4608 Client.exe 2768 Client.exe 4152 Client.exe - Suspicious use of WriteProcessMemory 28 IoCs
description pid Process procid_target PID 4628 wrote to memory of 2240 4628 ko66 final.exe 85 PID 4628 wrote to memory of 812 4628 ko66 final.exe 87 PID 812 wrote to memory of 2400 812 Client.exe 90 PID 812 wrote to memory of 3932 812 Client.exe 92 PID 3932 wrote to memory of 4596 3932 cmd.exe 94 PID 3932 wrote to memory of 2160 3932 cmd.exe 95 PID 3932 wrote to memory of 1412 3932 cmd.exe 103 PID 1412 wrote to memory of 2556 1412 Client.exe 104 PID 1412 wrote to memory of 892 1412 Client.exe 106 PID 892 wrote to memory of 1588 892 cmd.exe 108 PID 892 wrote to memory of 2696 892 cmd.exe 109 PID 892 wrote to memory of 2596 892 cmd.exe 110 PID 2596 wrote to memory of 2664 2596 Client.exe 111 PID 2596 wrote to memory of 3332 2596 Client.exe 113 PID 3332 wrote to memory of 4588 3332 cmd.exe 115 PID 3332 wrote to memory of 2580 3332 cmd.exe 116 PID 3332 wrote to memory of 4608 3332 cmd.exe 119 PID 4608 wrote to memory of 408 4608 Client.exe 120 PID 4608 wrote to memory of 4776 4608 Client.exe 122 PID 4776 wrote to memory of 4684 4776 cmd.exe 124 PID 4776 wrote to memory of 2392 4776 cmd.exe 125 PID 4776 wrote to memory of 2768 4776 cmd.exe 126 PID 2768 wrote to memory of 4832 2768 Client.exe 127 PID 2768 wrote to memory of 3896 2768 Client.exe 129 PID 3896 wrote to memory of 1784 3896 cmd.exe 131 PID 3896 wrote to memory of 4412 3896 cmd.exe 132 PID 3896 wrote to memory of 4152 3896 cmd.exe 133 PID 4152 wrote to memory of 5064 4152 Client.exe 134 - Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
Processes
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C:\Users\Admin\AppData\Local\Temp\ko66 final.exe"C:\Users\Admin\AppData\Local\Temp\ko66 final.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4628 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "dkmm" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
PID:2240
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"2⤵
- Checks computer location settings
- Executes dropped EXE
- Reads the TCP/IP host and domain name from the registry
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:812 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "dkmm" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
PID:2400
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\7h4uThzxpMlJ.bat" "3⤵
- Executes a command shell one-liner
- Suspicious use of WriteProcessMemory
PID:3932 -
C:\Windows\system32\chcp.comchcp 650014⤵PID:4596
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C:\Windows\system32\PING.EXEping -n 10 localhost4⤵
- System Network Configuration Discovery: Internet Connection Discovery
- Runs ping.exe
PID:2160
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"4⤵
- Checks computer location settings
- Executes dropped EXE
- Reads the TCP/IP host and domain name from the registry
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1412 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "dkmm" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f5⤵
- Scheduled Task/Job: Scheduled Task
PID:2556
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\nMFML2ZhM3lc.bat" "5⤵
- Executes a command shell one-liner
- Suspicious use of WriteProcessMemory
PID:892 -
C:\Windows\system32\chcp.comchcp 650016⤵PID:1588
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C:\Windows\system32\PING.EXEping -n 10 localhost6⤵
- System Network Configuration Discovery: Internet Connection Discovery
- Runs ping.exe
PID:2696
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"6⤵
- Checks computer location settings
- Executes dropped EXE
- Reads the TCP/IP host and domain name from the registry
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2596 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "dkmm" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f7⤵
- Scheduled Task/Job: Scheduled Task
PID:2664
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\0gWoqnKaumTT.bat" "7⤵
- Executes a command shell one-liner
- Suspicious use of WriteProcessMemory
PID:3332 -
C:\Windows\system32\chcp.comchcp 650018⤵PID:4588
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C:\Windows\system32\PING.EXEping -n 10 localhost8⤵
- System Network Configuration Discovery: Internet Connection Discovery
- Runs ping.exe
PID:2580
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"8⤵
- Checks computer location settings
- Executes dropped EXE
- Reads the TCP/IP host and domain name from the registry
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4608 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "dkmm" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f9⤵
- Scheduled Task/Job: Scheduled Task
PID:408
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\TDq356IGKkFe.bat" "9⤵
- Executes a command shell one-liner
- Suspicious use of WriteProcessMemory
PID:4776 -
C:\Windows\system32\chcp.comchcp 6500110⤵PID:4684
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C:\Windows\system32\PING.EXEping -n 10 localhost10⤵
- System Network Configuration Discovery: Internet Connection Discovery
- Runs ping.exe
PID:2392
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"10⤵
- Checks computer location settings
- Executes dropped EXE
- Reads the TCP/IP host and domain name from the registry
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2768 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "dkmm" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f11⤵
- Scheduled Task/Job: Scheduled Task
PID:4832
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\C5UiuHTPemur.bat" "11⤵
- Executes a command shell one-liner
- Suspicious use of WriteProcessMemory
PID:3896 -
C:\Windows\system32\chcp.comchcp 6500112⤵PID:1784
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C:\Windows\system32\PING.EXEping -n 10 localhost12⤵
- System Network Configuration Discovery: Internet Connection Discovery
- Runs ping.exe
PID:4412
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"12⤵
- Executes dropped EXE
- Reads the TCP/IP host and domain name from the registry
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4152 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "dkmm" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f13⤵
- Scheduled Task/Job: Scheduled Task
PID:5064
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exeC:\Users\Admin\AppData\Roaming\SubDir\Client.exe1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2336
Network
MITRE ATT&CK Enterprise v16
Execution
Command and Scripting Interpreter
1Windows Command Shell
1Scheduled Task/Job
1Scheduled Task
1Replay Monitor
Loading Replay Monitor...
Downloads
- Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Client.exe.log
- Size 1KB
- SHA256 ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924
- MD5 baf55b95da4a601229647f25dad12878
- SHA1 abc16954ebfd213733c4493fc1910164d825cac8
- SHA512 24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545
- TLSH T1B521CD712376B1D889163F422C5D2A8007BF0335BA50DE1CB9A9725ED9260171F222F3
- MD5 SHA1 SHA512 TLSH
- Path C:\Users\Admin\AppData\Local\Temp\0gWoqnKaumTT.bat
- Size 207B
- SHA256 e210af51bdf1fbc832608337272379d6623d6b23909213491bc4bddd57165135
- MD5 d56bb2180e90d5161d9cc764bab18811
- SHA1 09a9d0cb80bb7aa25be047a3e7ca98aa8209ecc2
- SHA512 c5662b91e5f76996e8b9a813b4d10743cb78d396cb55b96856bf1ab9adf9e7a05a74ae36cd56a3c795385b53183d558594b98ab6d3d633f2a9bafd267bde4897
- TLSH T1E4D023112781CD5D550018471F75A6C8B09B04B61F48BD638501489C4387D4C755B181
- MD5 SHA1 SHA512 TLSH
- Path C:\Users\Admin\AppData\Local\Temp\7h4uThzxpMlJ.bat
- Size 207B
- SHA256 6c5726580af482c582fb6db1917c498e526b94cc9bff1c778faf34a9e91da3d7
- MD5 e1fead31b61837a5e163a94dee54e844
- SHA1 e830ea903821921d973912aefbf0c1687c5aec79
- SHA512 244a773f0ce5cd25a1b001a2f32baaff2ec4248ebdccb024f1e2ede1c0029b3df47b8ec7af1b50ce996f766d79fa3cf80b912d530f6a227759caf187193c3b9b
- TLSH T1B0D0230123C0CD9D851058471E6562C8F09A04B61F0D7DA18505489C038688C759B181
- MD5 SHA1 SHA512 TLSH
- Path C:\Users\Admin\AppData\Local\Temp\C5UiuHTPemur.bat
- Size 207B
- SHA256 ffad333ca4e714988f558e2fb31d22602de0de8aaded834f0204f09890302dcc
- MD5 13eb6a83296173c714a6fd0f91e1f0ed
- SHA1 bed280d6b8b6715f1c573a622e9688d4126e5a0d
- SHA512 931ce0948dbb6f2d4d6778e811ac90cee75d7393df7508d6477b3ad5033c891ada053ee0b9a7d14f24efd30e430159b26e75b3462585718733a96bf5776c2b02
- TLSH T19FD023112340CD5D46001C472E6572CCB09E04B61F087DA24B11889C0386D5C756B141
- MD5 SHA1 SHA512 TLSH
- Path C:\Users\Admin\AppData\Local\Temp\TDq356IGKkFe.bat
- Size 207B
- SHA256 b877e3d59eb91f08e597624f6e7a0e9e61e03b6754d024a51fcd38726c0b4cf3
- MD5 7b7b80654d856b28bfaa0ecc6375c15f
- SHA1 c5b94997b13693ba0f05b5abb37bb908970572c8
- SHA512 84cb585b1ea749b76ce9ef9c62ff69b51c6a6739b4dfc297cc3a63d45d6bb61e914524d56f54e14a5a55065a713eaa5b5c88f49022177df8b16806ae0cf30e76
- TLSH T16FD023012340CD9D550118471F79A38CB0EE04B61F087D614511489C538689C755B541
- MD5 SHA1 SHA512 TLSH
- Path C:\Users\Admin\AppData\Local\Temp\nMFML2ZhM3lc.bat
- Size 207B
- SHA256 2d6e7f79b86be146c0f36374a7198a0f3c29ea44f792dedf7620e9f08f4cb6d1
- MD5 0a3c27fe416b5a5fcc0ff3c7614de6c0
- SHA1 83780c29231f8443d9164cceb2856eae3f801243
- SHA512 2325be20b54fd0df23cb592e16ec5992f9134495dd7ca26f95eddcf31ee74fee290c1d4276c2cf7fe3e5e7ae7c9c06cfa823117de2f20a5dd6244597261d7cec
- TLSH T139D023026381CD9D5501184B5D757288F09B04A61F087D71450148DC538689CB55B341
- MD5 SHA1 SHA512 TLSH
- Path C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
- Size 3.1MB
- SHA256 79f9ea4763751f7a7613fd8fd2c72a8834c8f1a7cda2984ef18c0705ba79a074
- MD5 3a7b8faf5b40f4347aad80abd6038006
- SHA1 6705fd0f6634d69c87582c6e34077a458e196ad0
- SHA512 792c6f57ddc2da4aca851ec12d0dc6f49018dc3c9323173b01db79fa1928faabd60a24cb6e9fbb2d3af0513ed3c815d53a9cb8a65e1d9077353193ed768c13ac
- SSDEEP 98304:3v8o2QSaNpzyPllgamYCZof/JKraJJ6z:f5Ofa
- TLSH T1A4E56B143BF85E27E1BBE27795B0041267F0FC1AB363EB0B6581677E1C53B5098426A7
- MD5 SHA1 SHA512 SSDEEP TLSH