Analysis
- max time kernel
58s - max time network
33s - platform
windows10-ltsc_2021_x64 - resource
win10ltsc2021-20260911-en - resource tags
arch:x64arch:x86image:win10ltsc2021-20260911-enlocale:en-usos:windows10-ltsc_2021-x64systemwindows - submitted
11/11/2026, 08:59
Behavioral task
behavioral1
Sample
Quasar.exe
Resource
win10v2004-20260911-en
Behavioral task
behavioral2
Sample
Quasar.exe
Resource
win10ltsc2021-20260911-en
Behavioral task
behavioral3
Sample
Quasar.exe
Resource
win11-20260911-en
General
- Target Quasar.exe
- Size 3.1MB
- Sample261111-kx44aaex6n
- SHA256 c3146b456a2ee8270b9990b40367a35d0bc83e970974a1bf184d0a13b1a84e1c
- MD5 d16a96560694d24590ce9fd19247acf6
- SHA1 2ce8415f89b6c536b4d130c5fbf85dc5ce52f148
- SHA512 398bf724f16e1406731a16e87e646a28892543d60ed97c2f3ef752147c2cb201c3705983f559e4df87b443b996a964e78a15e9855108be703a497f9199a6977b
- SSDEEP 98304:BvRD2j5awAQMP8lj9D31VJNN6laJJ6se:laDNHe
- TLSH T187E56B143BF85E27E1BBE277E5B0041267F0FC1AB363EB0B6581677A1C53B5098426A7
- 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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extratorrent.unblockerproxy.top/:8080
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www.extratorrent.unblockerproxy.top/:8080
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app.extratorrent.unblockerproxy.top/:8080
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c2.extratorrent.unblockerproxy.top/:8080
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api.extratorrent.unblockerproxy.top/:8080
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malware.extratorrent.unblockerproxy.top/:8080
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backdoor.extratorrent.unblockerproxy.top/: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 behavioral2/memory/2636-0-0x00000000003B0000-0x00000000006D4000-memory.dmp family_quasar behavioral2/files/0x000700000002858e-5.dat family_quasar - Checks computer location settings 2 TTPs 6 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-2814447569-4053889695-374664695-1000\Control Panel\International\Geo\Nation Client.exe Key value queried \REGISTRY\USER\S-1-5-21-2814447569-4053889695-374664695-1000\Control Panel\International\Geo\Nation Client.exe Key value queried \REGISTRY\USER\S-1-5-21-2814447569-4053889695-374664695-1000\Control Panel\International\Geo\Nation Client.exe Key value queried \REGISTRY\USER\S-1-5-21-2814447569-4053889695-374664695-1000\Control Panel\International\Geo\Nation Client.exe Key value queried \REGISTRY\USER\S-1-5-21-2814447569-4053889695-374664695-1000\Control Panel\International\Geo\Nation Client.exe Key value queried \REGISTRY\USER\S-1-5-21-2814447569-4053889695-374664695-1000\Control Panel\International\Geo\Nation Client.exe - Executes dropped EXE 7 IoCs
pid Process 3552 Client.exe 2368 Client.exe 4620 Client.exe 408 Client.exe 4228 Client.exe 4852 Client.exe 1236 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 6 IoCs
Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.
pid Process 2484 cmd.exe 4908 cmd.exe 2240 cmd.exe 2560 cmd.exe 4800 cmd.exe 4492 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\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\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\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\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\Domain 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\Domain Client.exe - System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 6 IoCs
Adversaries may check for Internet connectivity on compromised systems.
pid Process 3320 PING.EXE 1804 PING.EXE 2172 PING.EXE 3400 PING.EXE 2436 PING.EXE 4288 PING.EXE - Runs ping.exe 1 TTPs 6 IoCs
pid Process 2172 PING.EXE 3400 PING.EXE 2436 PING.EXE 4288 PING.EXE 3320 PING.EXE 1804 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 2096 schtasks.exe 4100 schtasks.exe 4220 schtasks.exe 1540 schtasks.exe 4480 schtasks.exe 2420 schtasks.exe 3840 schtasks.exe - Suspicious use of AdjustPrivilegeToken 8 IoCs
description pid Process Token: SeDebugPrivilege 2636 Quasar.exe Token: SeDebugPrivilege 3552 Client.exe Token: SeDebugPrivilege 2368 Client.exe Token: SeDebugPrivilege 4620 Client.exe Token: SeDebugPrivilege 408 Client.exe Token: SeDebugPrivilege 4228 Client.exe Token: SeDebugPrivilege 4852 Client.exe Token: SeDebugPrivilege 1236 Client.exe - Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 3552 Client.exe - Suspicious use of WriteProcessMemory 31 IoCs
description pid Process procid_target PID 2636 wrote to memory of 4100 2636 Quasar.exe 85 PID 2636 wrote to memory of 3552 2636 Quasar.exe 87 PID 3552 wrote to memory of 4220 3552 Client.exe 91 PID 3552 wrote to memory of 2484 3552 Client.exe 94 PID 2484 wrote to memory of 2232 2484 cmd.exe 96 PID 2484 wrote to memory of 2172 2484 cmd.exe 97 PID 2484 wrote to memory of 4620 2484 cmd.exe 102 PID 4620 wrote to memory of 1540 4620 Client.exe 104 PID 4620 wrote to memory of 4908 4620 Client.exe 106 PID 4908 wrote to memory of 1076 4908 cmd.exe 108 PID 4908 wrote to memory of 3400 4908 cmd.exe 109 PID 4908 wrote to memory of 408 4908 cmd.exe 110 PID 408 wrote to memory of 4480 408 Client.exe 111 PID 408 wrote to memory of 2240 408 Client.exe 113 PID 2240 wrote to memory of 2552 2240 cmd.exe 115 PID 2240 wrote to memory of 2436 2240 cmd.exe 116 PID 2240 wrote to memory of 4228 2240 cmd.exe 118 PID 4228 wrote to memory of 2420 4228 Client.exe 119 PID 4228 wrote to memory of 2560 4228 Client.exe 121 PID 2560 wrote to memory of 924 2560 cmd.exe 123 PID 2560 wrote to memory of 4288 2560 cmd.exe 124 PID 2560 wrote to memory of 4852 2560 cmd.exe 125 PID 4852 wrote to memory of 3840 4852 Client.exe 126 PID 4852 wrote to memory of 4800 4852 Client.exe 128 PID 4800 wrote to memory of 1144 4800 cmd.exe 130 PID 4800 wrote to memory of 3320 4800 cmd.exe 131 PID 4800 wrote to memory of 1236 4800 cmd.exe 132 PID 1236 wrote to memory of 2096 1236 Client.exe 133 PID 1236 wrote to memory of 4492 1236 Client.exe 135 PID 4492 wrote to memory of 2232 4492 cmd.exe 137 PID 4492 wrote to memory of 1804 4492 cmd.exe 138 - 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\Quasar.exe"C:\Users\Admin\AppData\Local\Temp\Quasar.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2636 -
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:4100
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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:3552 -
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:4220
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\fyRSrdiUYk86.bat" "3⤵
- Executes a command shell one-liner
- Suspicious use of WriteProcessMemory
PID:2484 -
C:\Windows\system32\chcp.comchcp 650014⤵PID:2232
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C:\Windows\system32\PING.EXEping -n 10 localhost4⤵
- System Network Configuration Discovery: Internet Connection Discovery
- Runs ping.exe
PID:2172
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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 WriteProcessMemory
PID:4620 -
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:1540
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\VE5eGti0G15o.bat" "5⤵
- Executes a command shell one-liner
- Suspicious use of WriteProcessMemory
PID:4908 -
C:\Windows\system32\chcp.comchcp 650016⤵PID:1076
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C:\Windows\system32\PING.EXEping -n 10 localhost6⤵
- System Network Configuration Discovery: Internet Connection Discovery
- Runs ping.exe
PID:3400
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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 WriteProcessMemory
PID:408 -
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:4480
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\UncAfdsjqJQ7.bat" "7⤵
- Executes a command shell one-liner
- Suspicious use of WriteProcessMemory
PID:2240 -
C:\Windows\system32\chcp.comchcp 650018⤵PID:2552
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C:\Windows\system32\PING.EXEping -n 10 localhost8⤵
- System Network Configuration Discovery: Internet Connection Discovery
- Runs ping.exe
PID:2436
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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 WriteProcessMemory
PID:4228 -
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:2420
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\ubVKRXW2i6ae.bat" "9⤵
- Executes a command shell one-liner
- Suspicious use of WriteProcessMemory
PID:2560 -
C:\Windows\system32\chcp.comchcp 6500110⤵PID:924
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C:\Windows\system32\PING.EXEping -n 10 localhost10⤵
- System Network Configuration Discovery: Internet Connection Discovery
- Runs ping.exe
PID:4288
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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 WriteProcessMemory
PID:4852 -
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:3840
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\RDJdbtcYHJV2.bat" "11⤵
- Executes a command shell one-liner
- Suspicious use of WriteProcessMemory
PID:4800 -
C:\Windows\system32\chcp.comchcp 6500112⤵PID:1144
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C:\Windows\system32\PING.EXEping -n 10 localhost12⤵
- System Network Configuration Discovery: Internet Connection Discovery
- Runs ping.exe
PID:3320
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"12⤵
- 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 WriteProcessMemory
PID:1236 -
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:2096
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\Ley05zdCyP7l.bat" "13⤵
- Executes a command shell one-liner
- Suspicious use of WriteProcessMemory
PID:4492 -
C:\Windows\system32\chcp.comchcp 6500114⤵PID:2232
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C:\Windows\system32\PING.EXEping -n 10 localhost14⤵
- System Network Configuration Discovery: Internet Connection Discovery
- Runs ping.exe
PID:1804
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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:2368
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 cc9248a177495f45ec70b86c34fc5746c56730af36ace98ac7eb365dbafda674
- MD5 b08c36ce99a5ed11891ef6fc6d8647e9
- SHA1 db95af417857221948eb1882e60f98ab2914bf1d
- SHA512 07e62581eace395b0a9699d727761648103180c21155d84ea09140f9e1c9690705c419118545aa67a564334bbde32710225fe3aa92b0b4b4210cb91f0058b1ea
- TLSH T17821CD7032B6A1D489063F460C6D65C407FF4329B950AE0C7AAC625EDD2B0175F313F2
- MD5 SHA1 SHA512 TLSH
- Path C:\Users\Admin\AppData\Local\Temp\Ley05zdCyP7l.bat
- Size 207B
- SHA256 9d31a2954d3c8e0bb823afa1fba6a092272d46c1d19b94a444cefd60393fa7fb
- MD5 d37b7dee78f748730e12a33b88f4ac07
- SHA1 11f2fa56e63f1bdbf4985c8bd2e298d2cd616bee
- SHA512 c7b0c3df734e2c4e77b8cd0a1c18b954abf9b8fc177ee19fd0ada697d9f3a965f1b5ec347103ee41fcb850b259ace6d145eae99b86cc77e45d3f3c5675f36711
- TLSH T1EDD0222273D0CE9E450018475EB9A288F0AF44EA2F4DBDA28A058CDC0386C8CB59B582
- MD5 SHA1 SHA512 TLSH
- Path C:\Users\Admin\AppData\Local\Temp\RDJdbtcYHJV2.bat
- Size 207B
- SHA256 547135e0675eac60229f92fbac1ec7a0098e235962b04747f910489717b67659
- MD5 7c0eda7581647a135f3a5c8cf86aa572
- SHA1 ac7a75bb7aac180bf095dc4f3cc98dfc84124c01
- SHA512 d7253767921d9da78a2618606c9728e0bb2b8a9fda9171cbe94535a8979adaceaaaa7849b4b4cbb4503f06e72e3474e14c8e1662f50bf33d24ddc094be9dc272
- TLSH T155D023412340CE6D85011C4B1D756688B09B04EB3F097D614511489C03968CC759F181
- MD5 SHA1 SHA512 TLSH
- Path C:\Users\Admin\AppData\Local\Temp\UncAfdsjqJQ7.bat
- Size 207B
- SHA256 8cf600e4b00cf3d4cfbf31a56b0b0e6c9fb80f64ac0905f862f4cff7a9ee7c63
- MD5 853f169d65076281544fa6bde15dfb49
- SHA1 38d8905ffa5bc32f8aaac080758e3b09a1321d9f
- SHA512 4e4ecb65d3aa6ede837d2bcec1f34200d2faeeae8bb22c6f3786af6df7631011d5a4e5e4ff5ec8e06f9f3d2ff4668c34e17a33bce89b1a8d93640dbf8ce3d4f0
- TLSH T1AAD023412345CD5FD50018471DA5638CB09A04A62F08BDA1C51188DC2387C5CB55B581
- MD5 SHA1 SHA512 TLSH
- Path C:\Users\Admin\AppData\Local\Temp\VE5eGti0G15o.bat
- Size 207B
- SHA256 d024f8574570016bf9ad5b4dda79526a164c470c038f0ac330561c4132ffe52c
- MD5 a58c6c6828c0c1c69c73c6995e3e5e2a
- SHA1 36b64fd51a75c47961e84d9215e63bdcb1c2a0e2
- SHA512 a6aa17ab2c10c1a3b6b4d3c06eb3ed06553a649510d5b60cbb3c4c893e5fd95869c4cae5fe98221508525f9a929c96ca98d5360cdd1989e214266a75a828fdb6
- TLSH T105D023413740CD9E450018475DA563D8B0EA04A72F087D714505489C53C6C8C755F142
- MD5 SHA1 SHA512 TLSH
- Path C:\Users\Admin\AppData\Local\Temp\fyRSrdiUYk86.bat
- Size 207B
- SHA256 bed0012985cb042be5a1dc01159010615b209ea6c8969d125c346cd360090585
- MD5 aa5569d500298891345c65af589cd448
- SHA1 fe13a052dcce1e6e7c714bd9ad58082711943e75
- SHA512 996ea41052048b5a0f8e4b3824abad563f44b7323d8fd1a44bccfd3427ba1b826f7d6ce712943ea0701494c6d3240feef009b0217780ca4c0da2cab85116d4ac
- TLSH T18BD023116340CD5D450058471F65E288F09A04A63F087DA14511C89C038698CB5DB141
- MD5 SHA1 SHA512 TLSH
- Path C:\Users\Admin\AppData\Local\Temp\ubVKRXW2i6ae.bat
- Size 207B
- SHA256 fcb9cd48e21197852dbcc067cea53fbfc567ce626abf77728ecb707a49166b2c
- MD5 cd0afa0ce0bfdbae14312d31dbcad810
- SHA1 f5fdc837c6bd99157d660e589592f5256bdc9962
- SHA512 ea20ea1386baffb9ac068aa818ca14f5881be00f94c68ed298a2122a79aa1137bdce139730161fac216756e7298b22ee02fb651b3c8b228d5fd0014cea61a1ed
- TLSH T109D023413780CD5F450118471D7562C8B09A04B62F0C7D61C5054C9C038684CB55B542
- MD5 SHA1 SHA512 TLSH
- Path C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
- Size 3.1MB
- SHA256 c3146b456a2ee8270b9990b40367a35d0bc83e970974a1bf184d0a13b1a84e1c
- MD5 d16a96560694d24590ce9fd19247acf6
- SHA1 2ce8415f89b6c536b4d130c5fbf85dc5ce52f148
- SHA512 398bf724f16e1406731a16e87e646a28892543d60ed97c2f3ef752147c2cb201c3705983f559e4df87b443b996a964e78a15e9855108be703a497f9199a6977b
- SSDEEP 98304:BvRD2j5awAQMP8lj9D31VJNN6laJJ6se:laDNHe
- TLSH T187E56B143BF85E27E1BBE277E5B0041267F0FC1AB363EB0B6581677A1C53B5098426A7
- MD5 SHA1 SHA512 SSDEEP TLSH