Analysis
-
max time kernel
89s -
max time network
100s -
platform
windows11-21h2_x64 -
resource
win11-20240412-en -
resource tags
arch:x64arch:x86image:win11-20240412-enlocale:en-usos:windows11-21h2-x64system -
submitted
23-04-2024 13:20
Static task
static1
Behavioral task
behavioral1
Sample
28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
Resource
win10v2004-20240412-en
General
-
Target
28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
-
Size
3.5MB
-
MD5
af1082c667a09a0f1f6adb041ca37d34
-
SHA1
ccb770b00596a1d2fa0d9d7d3dbe9451734a30f9
-
SHA256
28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6
-
SHA512
4d1c50b42077ec0a8f0060410e75201e920b951f299e8d9a247fb4ba3c920ef5d16f7b30e2decef5323d88e28e3daeee60ae3fcd1e00de36e0185336b1582404
-
SSDEEP
98304:p99xyD6/xKyfNf6wZsi/0+zqEsf+JQgWq:rXIc7fNf6Y4EsWxR
Malware Config
Extracted
quasar
1.4.1
Slave
157.20.182.46:4782
a5764ae9-1c39-4533-95ca-a5d90dae860a
-
encryption_key
BA20F732417E96C201B42F315FAD6CF773D77589
-
install_name
Client.exe
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
Client
-
subdirectory
SubDir
Signatures
-
Quasar payload 1 IoCs
Processes:
resource yara_rule behavioral2/memory/4596-26-0x0000000000400000-0x0000000000724000-memory.dmp family_quasar -
Processes:
svchost.exedescription ioc process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" svchost.exe -
Processes:
svchost.exedescription ioc process Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths svchost.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Roaming\svchost.exe = "0" svchost.exe -
Looks for VirtualBox Guest Additions in registry 2 TTPs 2 IoCs
Processes:
28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exesvchost.exedescription ioc process Key opened \REGISTRY\MACHINE\SOFTWARE\Oracle\VirtualBox Guest Additions 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe Key opened \REGISTRY\MACHINE\SOFTWARE\Oracle\VirtualBox Guest Additions svchost.exe -
Looks for VMWare Tools registry key 2 TTPs 2 IoCs
Processes:
28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exesvchost.exedescription ioc process Key opened \REGISTRY\MACHINE\SOFTWARE\VMware, Inc.\VMware Tools 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe Key opened \REGISTRY\MACHINE\SOFTWARE\VMware, Inc.\VMware Tools svchost.exe -
Checks BIOS information in registry 2 TTPs 4 IoCs
BIOS information is often read in order to detect sandboxing environments.
Processes:
svchost.exe28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exedescription ioc process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion svchost.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion svchost.exe -
Executes dropped EXE 2 IoCs
Processes:
svchost.exeClient.exepid process 4144 svchost.exe 1860 Client.exe -
Processes:
svchost.exedescription ioc process Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths svchost.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions svchost.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Roaming\svchost.exe = "0" svchost.exe -
Adds Run key to start application 2 TTPs 1 IoCs
Processes:
28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exedescription ioc process Set value (str) \REGISTRY\USER\S-1-5-21-801878912-692986033-442676226-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchost = "\"C:\\Users\\Admin\\AppData\\Roaming\\svchost.exe\"" 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe -
Processes:
svchost.exedescription ioc process Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA svchost.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" svchost.exe -
Maps connected drives based on registry 3 TTPs 4 IoCs
Disk information is often read in order to detect sandboxing environments.
Processes:
28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exesvchost.exedescription ioc process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum svchost.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0 svchost.exe -
Suspicious use of SetThreadContext 1 IoCs
Processes:
svchost.exedescription pid process target process PID 4144 set thread context of 4596 4144 svchost.exe msbuild.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
-
Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
-
Delays execution with timeout.exe 1 IoCs
Processes:
timeout.exepid process 2852 timeout.exe -
Suspicious behavior: EnumeratesProcesses 21 IoCs
Processes:
28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exepowershell.exepid process 456 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe 456 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe 456 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe 456 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe 456 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe 456 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe 456 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe 456 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe 456 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe 456 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe 456 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe 456 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe 456 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe 456 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe 456 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe 456 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe 456 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe 456 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe 456 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe 2196 powershell.exe 2196 powershell.exe -
Suspicious use of AdjustPrivilegeToken 4 IoCs
Processes:
28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exesvchost.exepowershell.exemsbuild.exedescription pid process Token: SeDebugPrivilege 456 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe Token: SeDebugPrivilege 4144 svchost.exe Token: SeDebugPrivilege 2196 powershell.exe Token: SeDebugPrivilege 4596 msbuild.exe -
Suspicious use of WriteProcessMemory 29 IoCs
Processes:
28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.execmd.execmd.exesvchost.exemsbuild.exedescription pid process target process PID 456 wrote to memory of 3160 456 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe cmd.exe PID 456 wrote to memory of 3160 456 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe cmd.exe PID 456 wrote to memory of 4360 456 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe cmd.exe PID 456 wrote to memory of 4360 456 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe cmd.exe PID 3160 wrote to memory of 3904 3160 cmd.exe schtasks.exe PID 3160 wrote to memory of 3904 3160 cmd.exe schtasks.exe PID 4360 wrote to memory of 2852 4360 cmd.exe timeout.exe PID 4360 wrote to memory of 2852 4360 cmd.exe timeout.exe PID 4360 wrote to memory of 4144 4360 cmd.exe svchost.exe PID 4360 wrote to memory of 4144 4360 cmd.exe svchost.exe PID 4144 wrote to memory of 2196 4144 svchost.exe powershell.exe PID 4144 wrote to memory of 2196 4144 svchost.exe powershell.exe PID 4144 wrote to memory of 3440 4144 svchost.exe CasPol.exe PID 4144 wrote to memory of 3440 4144 svchost.exe CasPol.exe PID 4144 wrote to memory of 3440 4144 svchost.exe CasPol.exe PID 4144 wrote to memory of 4596 4144 svchost.exe msbuild.exe PID 4144 wrote to memory of 4596 4144 svchost.exe msbuild.exe PID 4144 wrote to memory of 4596 4144 svchost.exe msbuild.exe PID 4144 wrote to memory of 4596 4144 svchost.exe msbuild.exe PID 4144 wrote to memory of 4596 4144 svchost.exe msbuild.exe PID 4144 wrote to memory of 4596 4144 svchost.exe msbuild.exe PID 4144 wrote to memory of 4596 4144 svchost.exe msbuild.exe PID 4144 wrote to memory of 4596 4144 svchost.exe msbuild.exe PID 4144 wrote to memory of 5108 4144 svchost.exe msbuild.exe PID 4144 wrote to memory of 5108 4144 svchost.exe msbuild.exe PID 4144 wrote to memory of 5108 4144 svchost.exe msbuild.exe PID 4596 wrote to memory of 1860 4596 msbuild.exe Client.exe PID 4596 wrote to memory of 1860 4596 msbuild.exe Client.exe PID 4596 wrote to memory of 1860 4596 msbuild.exe Client.exe -
System policy modification 1 TTPs 1 IoCs
Processes:
svchost.exedescription ioc process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" svchost.exe -
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
-
C:\Users\Admin\AppData\Local\Temp\28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe"C:\Users\Admin\AppData\Local\Temp\28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe"1⤵
- Looks for VirtualBox Guest Additions in registry
- Looks for VMWare Tools registry key
- Checks BIOS information in registry
- Adds Run key to start application
- Maps connected drives based on registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:456 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"' & exit2⤵
- Suspicious use of WriteProcessMemory
PID:3160 -
C:\Windows\system32\schtasks.exeschtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"'3⤵
- Creates scheduled task(s)
PID:3904 -
C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp4D35.tmp.bat""2⤵
- Suspicious use of WriteProcessMemory
PID:4360 -
C:\Windows\system32\timeout.exetimeout 33⤵
- Delays execution with timeout.exe
PID:2852 -
C:\Users\Admin\AppData\Roaming\svchost.exe"C:\Users\Admin\AppData\Roaming\svchost.exe"3⤵
- UAC bypass
- Windows security bypass
- Looks for VirtualBox Guest Additions in registry
- Looks for VMWare Tools registry key
- Checks BIOS information in registry
- Executes dropped EXE
- Windows security modification
- Checks whether UAC is enabled
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:4144 -
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\svchost.exe" -Force4⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2196 -
C:\Windows\Microsoft.NET\Framework\v4.0.30319\CasPol.exe"C:\Windows\Microsoft.NET\Framework\v4.0.30319\CasPol.exe"4⤵PID:3440
-
C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe"C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe"4⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4596 -
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"5⤵
- Executes dropped EXE
PID:1860 -
C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe"C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe"4⤵PID:5108
Network
MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Privilege Escalation
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Defense Evasion
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Impair Defenses
3Disable or Modify Tools
3Modify Registry
5Virtualization/Sandbox Evasion
2Replay Monitor
Loading Replay Monitor...
Downloads
-
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_q12fbsq1.msu.ps1Filesize
60B
MD5d17fe0a3f47be24a6453e9ef58c94641
SHA16ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA25696ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA5125b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
-
C:\Users\Admin\AppData\Local\Temp\tmp4D35.tmp.batFilesize
151B
MD5b2c9e0262be50bcba06b4c01a1565ddb
SHA16ac568a9ffa8a31828069cb21344013465353fdc
SHA25630cdedd12e33f4021ade2507a477407d0673a4e8a662c6d16f9cb1e120a8f359
SHA5120d6f5e04310960a327cf36d0d44bb1ab2687d771919f5d164a8e61ad8678548861373747ee4f6422a921283efedb8cef2b27e317299e8cc400b3bfafafc6a588
-
C:\Users\Admin\AppData\Roaming\SubDir\Client.exeFilesize
256KB
MD5d10a3cfcc08aae3a7234498f213cf89e
SHA1ccae4469a3a05fcb6e7af33019ca5357e5406dda
SHA2560da56bd07a486818b7735761001cc1d3ca5af645f369a3c206bcb6719fefff06
SHA51290a4a68b45113360d732ccac7698c74aa550c05d9883d287b808982800fce1a24abf69cf06b0f017babd647cafd3ca10aa894c59e6dab8ba1ff34c639bdf6427
-
C:\Users\Admin\AppData\Roaming\svchost.exeFilesize
3.5MB
MD5af1082c667a09a0f1f6adb041ca37d34
SHA1ccb770b00596a1d2fa0d9d7d3dbe9451734a30f9
SHA25628b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6
SHA5124d1c50b42077ec0a8f0060410e75201e920b951f299e8d9a247fb4ba3c920ef5d16f7b30e2decef5323d88e28e3daeee60ae3fcd1e00de36e0185336b1582404
-
memory/456-1-0x00007FFC9AD90000-0x00007FFC9B852000-memory.dmpFilesize
10.8MB
-
memory/456-2-0x0000025B7B420000-0x0000025B7B430000-memory.dmpFilesize
64KB
-
memory/456-3-0x0000025B7BB50000-0x0000025B7BEC8000-memory.dmpFilesize
3.5MB
-
memory/456-8-0x00007FFC9AD90000-0x00007FFC9B852000-memory.dmpFilesize
10.8MB
-
memory/456-0-0x0000025B79430000-0x0000025B79438000-memory.dmpFilesize
32KB
-
memory/1860-47-0x0000000005210000-0x0000000005220000-memory.dmpFilesize
64KB
-
memory/1860-45-0x0000000005220000-0x000000000537A000-memory.dmpFilesize
1.4MB
-
memory/1860-48-0x0000000074620000-0x0000000074DD1000-memory.dmpFilesize
7.7MB
-
memory/1860-44-0x0000000002A00000-0x0000000002A1A000-memory.dmpFilesize
104KB
-
memory/1860-42-0x0000000074620000-0x0000000074DD1000-memory.dmpFilesize
7.7MB
-
memory/1860-49-0x0000000005210000-0x0000000005220000-memory.dmpFilesize
64KB
-
memory/1860-41-0x00000000007A0000-0x00000000007E0000-memory.dmpFilesize
256KB
-
memory/2196-29-0x00007FFC9AD90000-0x00007FFC9B852000-memory.dmpFilesize
10.8MB
-
memory/2196-25-0x00000193E30E0000-0x00000193E30F0000-memory.dmpFilesize
64KB
-
memory/2196-21-0x00000193E3030000-0x00000193E3052000-memory.dmpFilesize
136KB
-
memory/2196-15-0x00000193E30E0000-0x00000193E30F0000-memory.dmpFilesize
64KB
-
memory/2196-14-0x00007FFC9AD90000-0x00007FFC9B852000-memory.dmpFilesize
10.8MB
-
memory/4144-34-0x00007FFC9AD90000-0x00007FFC9B852000-memory.dmpFilesize
10.8MB
-
memory/4144-13-0x00007FFC9AD90000-0x00007FFC9B852000-memory.dmpFilesize
10.8MB
-
memory/4596-32-0x00000000052B0000-0x0000000005342000-memory.dmpFilesize
584KB
-
memory/4596-33-0x0000000005230000-0x000000000523A000-memory.dmpFilesize
40KB
-
memory/4596-31-0x0000000005750000-0x0000000005CF6000-memory.dmpFilesize
5.6MB
-
memory/4596-30-0x0000000074620000-0x0000000074DD1000-memory.dmpFilesize
7.7MB
-
memory/4596-43-0x0000000074620000-0x0000000074DD1000-memory.dmpFilesize
7.7MB
-
memory/4596-26-0x0000000000400000-0x0000000000724000-memory.dmpFilesize
3.1MB