Analysis
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max time kernel
142s -
max time network
152s -
platform
windows10-2004_x64 -
resource
win10v2004-20240412-en -
resource tags
arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system -
submitted
25-04-2024 05:46
Static task
static1
Behavioral task
behavioral1
Sample
krummy-lavacrypt-gfhd.exe
Resource
win7-20240221-en
General
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Target
krummy-lavacrypt-gfhd.exe
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Size
3.5MB
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MD5
af1082c667a09a0f1f6adb041ca37d34
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SHA1
ccb770b00596a1d2fa0d9d7d3dbe9451734a30f9
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SHA256
28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6
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SHA512
4d1c50b42077ec0a8f0060410e75201e920b951f299e8d9a247fb4ba3c920ef5d16f7b30e2decef5323d88e28e3daeee60ae3fcd1e00de36e0185336b1582404
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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
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encryption_key
BA20F732417E96C201B42F315FAD6CF773D77589
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install_name
Client.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
Client
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subdirectory
SubDir
Signatures
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Quasar payload 1 IoCs
Processes:
resource yara_rule behavioral2/memory/4764-26-0x0000000000400000-0x0000000000724000-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:
krummy-lavacrypt-gfhd.exesvchost.exedescription ioc process Key opened \REGISTRY\MACHINE\SOFTWARE\Oracle\VirtualBox Guest Additions krummy-lavacrypt-gfhd.exe Key opened \REGISTRY\MACHINE\SOFTWARE\Oracle\VirtualBox Guest Additions svchost.exe -
Looks for VMWare Tools registry key 2 TTPs 2 IoCs
Processes:
krummy-lavacrypt-gfhd.exesvchost.exedescription ioc process Key opened \REGISTRY\MACHINE\SOFTWARE\VMware, Inc.\VMware Tools krummy-lavacrypt-gfhd.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:
krummy-lavacrypt-gfhd.exesvchost.exedescription ioc process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion krummy-lavacrypt-gfhd.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion svchost.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion svchost.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion krummy-lavacrypt-gfhd.exe -
Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
krummy-lavacrypt-gfhd.exesvchost.exedescription ioc process Key value queried \REGISTRY\USER\S-1-5-21-355664440-2199602304-1223909400-1000\Control Panel\International\Geo\Nation krummy-lavacrypt-gfhd.exe Key value queried \REGISTRY\USER\S-1-5-21-355664440-2199602304-1223909400-1000\Control Panel\International\Geo\Nation svchost.exe -
Executes dropped EXE 2 IoCs
Processes:
svchost.exeClient.exepid process 3520 svchost.exe 2088 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:
krummy-lavacrypt-gfhd.exedescription ioc process Set value (str) \REGISTRY\USER\S-1-5-21-355664440-2199602304-1223909400-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\svchost = "\"C:\\Users\\Admin\\AppData\\Roaming\\svchost.exe\"" krummy-lavacrypt-gfhd.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:
krummy-lavacrypt-gfhd.exesvchost.exedescription ioc process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum krummy-lavacrypt-gfhd.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0 krummy-lavacrypt-gfhd.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 3520 set thread context of 4764 3520 svchost.exe regasm.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
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Delays execution with timeout.exe 1 IoCs
Processes:
timeout.exepid process 4632 timeout.exe -
Suspicious behavior: EnumeratesProcesses 26 IoCs
Processes:
krummy-lavacrypt-gfhd.exepowershell.exepid process 868 krummy-lavacrypt-gfhd.exe 868 krummy-lavacrypt-gfhd.exe 868 krummy-lavacrypt-gfhd.exe 868 krummy-lavacrypt-gfhd.exe 868 krummy-lavacrypt-gfhd.exe 868 krummy-lavacrypt-gfhd.exe 868 krummy-lavacrypt-gfhd.exe 868 krummy-lavacrypt-gfhd.exe 868 krummy-lavacrypt-gfhd.exe 868 krummy-lavacrypt-gfhd.exe 868 krummy-lavacrypt-gfhd.exe 868 krummy-lavacrypt-gfhd.exe 868 krummy-lavacrypt-gfhd.exe 868 krummy-lavacrypt-gfhd.exe 868 krummy-lavacrypt-gfhd.exe 868 krummy-lavacrypt-gfhd.exe 868 krummy-lavacrypt-gfhd.exe 868 krummy-lavacrypt-gfhd.exe 868 krummy-lavacrypt-gfhd.exe 868 krummy-lavacrypt-gfhd.exe 868 krummy-lavacrypt-gfhd.exe 868 krummy-lavacrypt-gfhd.exe 868 krummy-lavacrypt-gfhd.exe 1320 powershell.exe 1320 powershell.exe 1320 powershell.exe -
Suspicious use of AdjustPrivilegeToken 4 IoCs
Processes:
krummy-lavacrypt-gfhd.exesvchost.exepowershell.exeregasm.exedescription pid process Token: SeDebugPrivilege 868 krummy-lavacrypt-gfhd.exe Token: SeDebugPrivilege 3520 svchost.exe Token: SeDebugPrivilege 1320 powershell.exe Token: SeDebugPrivilege 4764 regasm.exe -
Suspicious use of WriteProcessMemory 29 IoCs
Processes:
krummy-lavacrypt-gfhd.execmd.execmd.exesvchost.exeregasm.exedescription pid process target process PID 868 wrote to memory of 3428 868 krummy-lavacrypt-gfhd.exe cmd.exe PID 868 wrote to memory of 3428 868 krummy-lavacrypt-gfhd.exe cmd.exe PID 868 wrote to memory of 3052 868 krummy-lavacrypt-gfhd.exe cmd.exe PID 868 wrote to memory of 3052 868 krummy-lavacrypt-gfhd.exe cmd.exe PID 3052 wrote to memory of 4632 3052 cmd.exe timeout.exe PID 3052 wrote to memory of 4632 3052 cmd.exe timeout.exe PID 3428 wrote to memory of 2408 3428 cmd.exe schtasks.exe PID 3428 wrote to memory of 2408 3428 cmd.exe schtasks.exe PID 3052 wrote to memory of 3520 3052 cmd.exe svchost.exe PID 3052 wrote to memory of 3520 3052 cmd.exe svchost.exe PID 3520 wrote to memory of 1320 3520 svchost.exe powershell.exe PID 3520 wrote to memory of 1320 3520 svchost.exe powershell.exe PID 3520 wrote to memory of 4480 3520 svchost.exe jsc.exe PID 3520 wrote to memory of 4480 3520 svchost.exe jsc.exe PID 3520 wrote to memory of 4480 3520 svchost.exe jsc.exe PID 3520 wrote to memory of 4764 3520 svchost.exe regasm.exe PID 3520 wrote to memory of 4764 3520 svchost.exe regasm.exe PID 3520 wrote to memory of 4764 3520 svchost.exe regasm.exe PID 3520 wrote to memory of 4764 3520 svchost.exe regasm.exe PID 3520 wrote to memory of 4764 3520 svchost.exe regasm.exe PID 3520 wrote to memory of 4764 3520 svchost.exe regasm.exe PID 3520 wrote to memory of 4764 3520 svchost.exe regasm.exe PID 3520 wrote to memory of 4764 3520 svchost.exe regasm.exe PID 3520 wrote to memory of 4152 3520 svchost.exe regasm.exe PID 3520 wrote to memory of 4152 3520 svchost.exe regasm.exe PID 3520 wrote to memory of 4152 3520 svchost.exe regasm.exe PID 4764 wrote to memory of 2088 4764 regasm.exe Client.exe PID 4764 wrote to memory of 2088 4764 regasm.exe Client.exe PID 4764 wrote to memory of 2088 4764 regasm.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
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C:\Users\Admin\AppData\Local\Temp\krummy-lavacrypt-gfhd.exe"C:\Users\Admin\AppData\Local\Temp\krummy-lavacrypt-gfhd.exe"1⤵
- Looks for VirtualBox Guest Additions in registry
- Looks for VMWare Tools registry key
- Checks BIOS information in registry
- Checks computer location settings
- Adds Run key to start application
- Maps connected drives based on registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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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
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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)
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp3DC4.tmp.bat""2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\timeout.exetimeout 33⤵
- Delays execution with timeout.exe
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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
- Checks computer location settings
- 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
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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
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C:\Windows\Microsoft.NET\Framework\v4.0.30319\jsc.exe"C:\Windows\Microsoft.NET\Framework\v4.0.30319\jsc.exe"4⤵
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C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe"C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe"4⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"5⤵
- Executes dropped EXE
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C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe"C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe"4⤵
Network
MITRE ATT&CK Matrix ATT&CK v13
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
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C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_rtz3khrj.ika.ps1Filesize
60B
MD5d17fe0a3f47be24a6453e9ef58c94641
SHA16ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA25696ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA5125b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
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C:\Users\Admin\AppData\Local\Temp\tmp3DC4.tmp.batFilesize
151B
MD50131d063618ea4b62eef73989ce7c672
SHA147b82b42ca9e92bbe42b9719ab75be1924df819f
SHA256a11654f67f41b893c66f688b5bcae872d814c29375faa022369df26762598fad
SHA5126eec08bd9a6235365c69789c31ae107b340cc3b6b3a11de61cff4c7f2ea63d7f648a3232373cbbc4d88e93fd6ea37365d2d8936c34df18509d2ab6cb91bc5515
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exeFilesize
63KB
MD50d5df43af2916f47d00c1573797c1a13
SHA1230ab5559e806574d26b4c20847c368ed55483b0
SHA256c066aee7aa3aa83f763ebc5541daa266ed6c648fbffcde0d836a13b221bb2adc
SHA512f96cf9e1890746b12daf839a6d0f16f062b72c1b8a40439f96583f242980f10f867720232a6fa0f7d4d7ac0a7a6143981a5a130d6417ea98b181447134c7cfe2
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C:\Users\Admin\AppData\Roaming\svchost.exeFilesize
3.5MB
MD5af1082c667a09a0f1f6adb041ca37d34
SHA1ccb770b00596a1d2fa0d9d7d3dbe9451734a30f9
SHA25628b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6
SHA5124d1c50b42077ec0a8f0060410e75201e920b951f299e8d9a247fb4ba3c920ef5d16f7b30e2decef5323d88e28e3daeee60ae3fcd1e00de36e0185336b1582404
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memory/868-0-0x00000289ABD00000-0x00000289ABD08000-memory.dmpFilesize
32KB
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memory/868-2-0x00000289C6250000-0x00000289C6260000-memory.dmpFilesize
64KB
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memory/868-3-0x00000289C6260000-0x00000289C65D8000-memory.dmpFilesize
3.5MB
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memory/868-1-0x00007FF90CF40000-0x00007FF90DA01000-memory.dmpFilesize
10.8MB
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memory/868-8-0x00007FF90CF40000-0x00007FF90DA01000-memory.dmpFilesize
10.8MB
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memory/1320-25-0x000001BF30460000-0x000001BF30470000-memory.dmpFilesize
64KB
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memory/1320-20-0x000001BF303F0000-0x000001BF30412000-memory.dmpFilesize
136KB
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memory/1320-21-0x00007FF90CA50000-0x00007FF90D511000-memory.dmpFilesize
10.8MB
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memory/1320-29-0x00007FF90CA50000-0x00007FF90D511000-memory.dmpFilesize
10.8MB
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memory/2088-46-0x0000000074140000-0x00000000748F0000-memory.dmpFilesize
7.7MB
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memory/2088-44-0x0000000074140000-0x00000000748F0000-memory.dmpFilesize
7.7MB
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memory/2088-42-0x0000000000FE0000-0x0000000000FF2000-memory.dmpFilesize
72KB
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memory/3520-35-0x00007FF90CA50000-0x00007FF90D511000-memory.dmpFilesize
10.8MB
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memory/3520-13-0x00007FF90CA50000-0x00007FF90D511000-memory.dmpFilesize
10.8MB
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memory/4764-26-0x0000000000400000-0x0000000000724000-memory.dmpFilesize
3.1MB
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memory/4764-34-0x0000000005290000-0x000000000529A000-memory.dmpFilesize
40KB
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memory/4764-33-0x00000000052F0000-0x0000000005300000-memory.dmpFilesize
64KB
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memory/4764-43-0x0000000074140000-0x00000000748F0000-memory.dmpFilesize
7.7MB
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memory/4764-32-0x0000000005300000-0x0000000005392000-memory.dmpFilesize
584KB
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memory/4764-31-0x0000000005790000-0x0000000005D34000-memory.dmpFilesize
5.6MB
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memory/4764-30-0x0000000074140000-0x00000000748F0000-memory.dmpFilesize
7.7MB