Analysis
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max time kernel
145s -
max time network
151s -
platform
windows7_x64 -
resource
win7-20220812-en -
resource tags
arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system -
submitted
30-11-2022 17:49
Static task
static1
Behavioral task
behavioral1
Sample
b4b4889b0d6ac058b3d39e62c9cb32fea0abb700b92e1e10325e0854470aac50.exe
Resource
win7-20220812-en
General
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Target
b4b4889b0d6ac058b3d39e62c9cb32fea0abb700b92e1e10325e0854470aac50.exe
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Size
680KB
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MD5
3d9e3bf3109bfe73bccfb57e360fe465
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SHA1
36bd2e71a35f678c8d1e8066e616706f2dcb8610
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SHA256
b4b4889b0d6ac058b3d39e62c9cb32fea0abb700b92e1e10325e0854470aac50
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SHA512
f24992b8f03df563eca83cce818a0d5af04094acde38af3d0acf1ec40ae87272156f56ab72121becbd82f77d296ad39b60939d2282e0167b11dcf3b33db43be7
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SSDEEP
12288:a5393whFOBbosXQsI6f9fqAPzzEeEZchCBywRiaxJDj8DkIonQmP0Ove/diuHc:a53uhFzsAibzzEe9wRiaLSkI8QhOQ18
Malware Config
Extracted
quasar
2.1.0.0
ajith
23.105.131.178:7812
VNM_MUTEX_NdVd2sPSSqFdo7I35g
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encryption_key
jyerms3KOWmt3C9DBFuq
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install_name
Windows Defender Security.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
Windows Update
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subdirectory
SubDir
Signatures
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Contains code to disable Windows Defender 7 IoCs
A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.
resource yara_rule behavioral1/memory/1468-66-0x0000000000400000-0x000000000048C000-memory.dmp disable_win_def behavioral1/memory/1468-67-0x0000000000400000-0x000000000048C000-memory.dmp disable_win_def behavioral1/memory/1468-68-0x0000000000400000-0x000000000048C000-memory.dmp disable_win_def behavioral1/memory/1468-69-0x0000000000486C4E-mapping.dmp disable_win_def behavioral1/memory/1468-72-0x0000000000400000-0x000000000048C000-memory.dmp disable_win_def behavioral1/memory/1468-74-0x0000000000400000-0x000000000048C000-memory.dmp disable_win_def behavioral1/memory/1084-88-0x0000000000486C4E-mapping.dmp disable_win_def -
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection Windows Security.exe_protected.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1" Windows Security.exe_protected.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1" Windows Security.exe_protected.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1" Windows Security.exe_protected.exe -
Quasar payload 7 IoCs
resource yara_rule behavioral1/memory/1468-66-0x0000000000400000-0x000000000048C000-memory.dmp family_quasar behavioral1/memory/1468-67-0x0000000000400000-0x000000000048C000-memory.dmp family_quasar behavioral1/memory/1468-68-0x0000000000400000-0x000000000048C000-memory.dmp family_quasar behavioral1/memory/1468-69-0x0000000000486C4E-mapping.dmp family_quasar behavioral1/memory/1468-72-0x0000000000400000-0x000000000048C000-memory.dmp family_quasar behavioral1/memory/1468-74-0x0000000000400000-0x000000000048C000-memory.dmp family_quasar behavioral1/memory/1084-88-0x0000000000486C4E-mapping.dmp family_quasar -
Executes dropped EXE 4 IoCs
pid Process 984 Windows Security.exe_protected.exe 1468 Windows Security.exe_protected.exe 704 Windows Defender Security.exe 1084 Windows Defender Security.exe -
Deletes itself 1 IoCs
pid Process 1712 cmd.exe -
Loads dropped DLL 3 IoCs
pid Process 836 b4b4889b0d6ac058b3d39e62c9cb32fea0abb700b92e1e10325e0854470aac50.exe 984 Windows Security.exe_protected.exe 1468 Windows Security.exe_protected.exe -
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Features Windows Security.exe_protected.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0" Windows Security.exe_protected.exe -
Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\Windows Services = "C:\\Users\\Admin\\AppData\\Roaming\\Windows Update Folder\\Windows Update.exe" Windows Security.exe_protected.exe -
Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
flow ioc 1 ip-api.com -
Suspicious use of SetThreadContext 2 IoCs
description pid Process procid_target PID 984 set thread context of 1468 984 Windows Security.exe_protected.exe 28 PID 704 set thread context of 1084 704 Windows Defender Security.exe 33 -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 952 schtasks.exe 2012 schtasks.exe -
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\A8985D3A65E5E5C4B2D7D66D40C6DD2FB19C5436 Windows Security.exe_protected.exe Set value (data) \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\A8985D3A65E5E5C4B2D7D66D40C6DD2FB19C5436\Blob = 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 Windows Security.exe_protected.exe -
Suspicious behavior: EnumeratesProcesses 8 IoCs
pid Process 1176 powershell.exe 1468 Windows Security.exe_protected.exe 1468 Windows Security.exe_protected.exe 1468 Windows Security.exe_protected.exe 1468 Windows Security.exe_protected.exe 1468 Windows Security.exe_protected.exe 1468 Windows Security.exe_protected.exe 1468 Windows Security.exe_protected.exe -
Suspicious use of AdjustPrivilegeToken 4 IoCs
description pid Process Token: SeDebugPrivilege 1468 Windows Security.exe_protected.exe Token: SeDebugPrivilege 1084 Windows Defender Security.exe Token: SeDebugPrivilege 1084 Windows Defender Security.exe Token: SeDebugPrivilege 1176 powershell.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 1084 Windows Defender Security.exe -
Suspicious use of WriteProcessMemory 54 IoCs
description pid Process procid_target PID 836 wrote to memory of 984 836 b4b4889b0d6ac058b3d39e62c9cb32fea0abb700b92e1e10325e0854470aac50.exe 27 PID 836 wrote to memory of 984 836 b4b4889b0d6ac058b3d39e62c9cb32fea0abb700b92e1e10325e0854470aac50.exe 27 PID 836 wrote to memory of 984 836 b4b4889b0d6ac058b3d39e62c9cb32fea0abb700b92e1e10325e0854470aac50.exe 27 PID 836 wrote to memory of 984 836 b4b4889b0d6ac058b3d39e62c9cb32fea0abb700b92e1e10325e0854470aac50.exe 27 PID 984 wrote to memory of 1468 984 Windows Security.exe_protected.exe 28 PID 984 wrote to memory of 1468 984 Windows Security.exe_protected.exe 28 PID 984 wrote to memory of 1468 984 Windows Security.exe_protected.exe 28 PID 984 wrote to memory of 1468 984 Windows Security.exe_protected.exe 28 PID 984 wrote to memory of 1468 984 Windows Security.exe_protected.exe 28 PID 984 wrote to memory of 1468 984 Windows Security.exe_protected.exe 28 PID 984 wrote to memory of 1468 984 Windows Security.exe_protected.exe 28 PID 984 wrote to memory of 1468 984 Windows Security.exe_protected.exe 28 PID 984 wrote to memory of 1468 984 Windows Security.exe_protected.exe 28 PID 1468 wrote to memory of 952 1468 Windows Security.exe_protected.exe 30 PID 1468 wrote to memory of 952 1468 Windows Security.exe_protected.exe 30 PID 1468 wrote to memory of 952 1468 Windows Security.exe_protected.exe 30 PID 1468 wrote to memory of 952 1468 Windows Security.exe_protected.exe 30 PID 1468 wrote to memory of 704 1468 Windows Security.exe_protected.exe 32 PID 1468 wrote to memory of 704 1468 Windows Security.exe_protected.exe 32 PID 1468 wrote to memory of 704 1468 Windows Security.exe_protected.exe 32 PID 1468 wrote to memory of 704 1468 Windows Security.exe_protected.exe 32 PID 704 wrote to memory of 1084 704 Windows Defender Security.exe 33 PID 704 wrote to memory of 1084 704 Windows Defender Security.exe 33 PID 704 wrote to memory of 1084 704 Windows Defender Security.exe 33 PID 704 wrote to memory of 1084 704 Windows Defender Security.exe 33 PID 704 wrote to memory of 1084 704 Windows Defender Security.exe 33 PID 704 wrote to memory of 1084 704 Windows Defender Security.exe 33 PID 704 wrote to memory of 1084 704 Windows Defender Security.exe 33 PID 704 wrote to memory of 1084 704 Windows Defender Security.exe 33 PID 704 wrote to memory of 1084 704 Windows Defender Security.exe 33 PID 1468 wrote to memory of 1176 1468 Windows Security.exe_protected.exe 34 PID 1468 wrote to memory of 1176 1468 Windows Security.exe_protected.exe 34 PID 1468 wrote to memory of 1176 1468 Windows Security.exe_protected.exe 34 PID 1468 wrote to memory of 1176 1468 Windows Security.exe_protected.exe 34 PID 1084 wrote to memory of 2012 1084 Windows Defender Security.exe 36 PID 1084 wrote to memory of 2012 1084 Windows Defender Security.exe 36 PID 1084 wrote to memory of 2012 1084 Windows Defender Security.exe 36 PID 1084 wrote to memory of 2012 1084 Windows Defender Security.exe 36 PID 1468 wrote to memory of 944 1468 Windows Security.exe_protected.exe 38 PID 1468 wrote to memory of 944 1468 Windows Security.exe_protected.exe 38 PID 1468 wrote to memory of 944 1468 Windows Security.exe_protected.exe 38 PID 1468 wrote to memory of 944 1468 Windows Security.exe_protected.exe 38 PID 944 wrote to memory of 1712 944 cmd.exe 41 PID 944 wrote to memory of 1712 944 cmd.exe 41 PID 944 wrote to memory of 1712 944 cmd.exe 41 PID 944 wrote to memory of 1712 944 cmd.exe 41 PID 1468 wrote to memory of 1508 1468 Windows Security.exe_protected.exe 40 PID 1468 wrote to memory of 1508 1468 Windows Security.exe_protected.exe 40 PID 1468 wrote to memory of 1508 1468 Windows Security.exe_protected.exe 40 PID 1468 wrote to memory of 1508 1468 Windows Security.exe_protected.exe 40 PID 1508 wrote to memory of 1544 1508 cmd.exe 43 PID 1508 wrote to memory of 1544 1508 cmd.exe 43 PID 1508 wrote to memory of 1544 1508 cmd.exe 43 PID 1508 wrote to memory of 1544 1508 cmd.exe 43
Processes
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C:\Users\Admin\AppData\Local\Temp\b4b4889b0d6ac058b3d39e62c9cb32fea0abb700b92e1e10325e0854470aac50.exe"C:\Users\Admin\AppData\Local\Temp\b4b4889b0d6ac058b3d39e62c9cb32fea0abb700b92e1e10325e0854470aac50.exe"1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:836 -
C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe"C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe" /silent2⤵
- Executes dropped EXE
- Loads dropped DLL
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:984 -
C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe"C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe"3⤵
- Modifies Windows Defender Real-time Protection settings
- Executes dropped EXE
- Loads dropped DLL
- Windows security modification
- Modifies system certificate store
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1468 -
C:\Windows\SysWOW64\schtasks.exe"schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe" /rl HIGHEST /f4⤵
- Creates scheduled task(s)
PID:952
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C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe"C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe"4⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:704 -
C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe"C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe"5⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1084 -
C:\Windows\SysWOW64\schtasks.exe"schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe" /rl HIGHEST /f6⤵
- Creates scheduled task(s)
PID:2012
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C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe"powershell" Get-MpPreference -verbose4⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1176
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /k start /b del /q/f/s %TEMP%\* & exit4⤵
- Suspicious use of WriteProcessMemory
PID:944 -
C:\Windows\SysWOW64\cmd.exeC:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*5⤵
- Deletes itself
PID:1712
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C:\Windows\SysWOW64\cmd.execmd /c ""C:\Users\Admin\AppData\Local\Temp\KYTAbvvkUa3n.bat" "4⤵
- Suspicious use of WriteProcessMemory
PID:1508 -
C:\Windows\SysWOW64\chcp.comchcp 650015⤵PID:1544
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
648KB
MD5763dd9b7f2a5183a1380bee36889f936
SHA1cdc7f9911a853973fc83d0e1a51ee5e82da347c9
SHA2564be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039
SHA5127ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c
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Filesize
648KB
MD5763dd9b7f2a5183a1380bee36889f936
SHA1cdc7f9911a853973fc83d0e1a51ee5e82da347c9
SHA2564be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039
SHA5127ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c
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Filesize
648KB
MD5763dd9b7f2a5183a1380bee36889f936
SHA1cdc7f9911a853973fc83d0e1a51ee5e82da347c9
SHA2564be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039
SHA5127ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c
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Filesize
239B
MD592c5320bca10671f10dcdd8d6093a5b6
SHA1bd14f3814623329a6c1d21900bac44d3eabf16b3
SHA25602362a8b1ad99aead3b49735388a230fdbc901cc9adf425f0c7d7c38d4f1cd4f
SHA5124462fae207beec626cd9b0d65804ed0f784139112ac7da6888979fc2f4df47ff37e5be3d4894f6cf75b535fb1bc509e32323a20be5b9b86ccc0b6f3d71e7f5b4
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Filesize
648KB
MD5763dd9b7f2a5183a1380bee36889f936
SHA1cdc7f9911a853973fc83d0e1a51ee5e82da347c9
SHA2564be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039
SHA5127ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c
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Filesize
648KB
MD5763dd9b7f2a5183a1380bee36889f936
SHA1cdc7f9911a853973fc83d0e1a51ee5e82da347c9
SHA2564be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039
SHA5127ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c
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Filesize
648KB
MD5763dd9b7f2a5183a1380bee36889f936
SHA1cdc7f9911a853973fc83d0e1a51ee5e82da347c9
SHA2564be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039
SHA5127ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c
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Filesize
648KB
MD5763dd9b7f2a5183a1380bee36889f936
SHA1cdc7f9911a853973fc83d0e1a51ee5e82da347c9
SHA2564be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039
SHA5127ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c
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Filesize
648KB
MD5763dd9b7f2a5183a1380bee36889f936
SHA1cdc7f9911a853973fc83d0e1a51ee5e82da347c9
SHA2564be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039
SHA5127ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c
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Filesize
648KB
MD5763dd9b7f2a5183a1380bee36889f936
SHA1cdc7f9911a853973fc83d0e1a51ee5e82da347c9
SHA2564be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039
SHA5127ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c