Analysis
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max time kernel
141s -
max time network
123s -
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 05:45
Static task
static1
Behavioral task
behavioral1
Sample
krummy-lavacrypt-gfhd.exe
Resource
win7-20231129-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/920-14-0x0000000000400000-0x0000000000724000-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:
svchost.exekrummy-lavacrypt-gfhd.exedescription ioc process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion svchost.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion krummy-lavacrypt-gfhd.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion krummy-lavacrypt-gfhd.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion svchost.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-1-5-21-2288054676-1871194608-3559553667-1000\Control Panel\International\Geo\Nation krummy-lavacrypt-gfhd.exe Key value queried \REGISTRY\USER\S-1-5-21-2288054676-1871194608-3559553667-1000\Control Panel\International\Geo\Nation svchost.exe -
Executes dropped EXE 2 IoCs
Processes:
svchost.exeClient.exepid process 4900 svchost.exe 1092 Client.exe -
Processes:
svchost.exedescription ioc process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Roaming\svchost.exe = "0" svchost.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths svchost.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions 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-1-5-21-2288054676-1871194608-3559553667-1000\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 4900 set thread context of 920 4900 svchost.exe msbuild.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 4104 timeout.exe -
Suspicious behavior: EnumeratesProcesses 26 IoCs
Processes:
krummy-lavacrypt-gfhd.exepowershell.exepid process 220 krummy-lavacrypt-gfhd.exe 220 krummy-lavacrypt-gfhd.exe 220 krummy-lavacrypt-gfhd.exe 220 krummy-lavacrypt-gfhd.exe 220 krummy-lavacrypt-gfhd.exe 220 krummy-lavacrypt-gfhd.exe 220 krummy-lavacrypt-gfhd.exe 220 krummy-lavacrypt-gfhd.exe 220 krummy-lavacrypt-gfhd.exe 220 krummy-lavacrypt-gfhd.exe 220 krummy-lavacrypt-gfhd.exe 220 krummy-lavacrypt-gfhd.exe 220 krummy-lavacrypt-gfhd.exe 220 krummy-lavacrypt-gfhd.exe 220 krummy-lavacrypt-gfhd.exe 220 krummy-lavacrypt-gfhd.exe 220 krummy-lavacrypt-gfhd.exe 220 krummy-lavacrypt-gfhd.exe 220 krummy-lavacrypt-gfhd.exe 220 krummy-lavacrypt-gfhd.exe 220 krummy-lavacrypt-gfhd.exe 220 krummy-lavacrypt-gfhd.exe 220 krummy-lavacrypt-gfhd.exe 1104 powershell.exe 1104 powershell.exe 1104 powershell.exe -
Suspicious use of AdjustPrivilegeToken 4 IoCs
Processes:
krummy-lavacrypt-gfhd.exesvchost.exepowershell.exemsbuild.exedescription pid process Token: SeDebugPrivilege 220 krummy-lavacrypt-gfhd.exe Token: SeDebugPrivilege 4900 svchost.exe Token: SeDebugPrivilege 1104 powershell.exe Token: SeDebugPrivilege 920 msbuild.exe -
Suspicious use of WriteProcessMemory 23 IoCs
Processes:
krummy-lavacrypt-gfhd.execmd.execmd.exesvchost.exemsbuild.exedescription pid process target process PID 220 wrote to memory of 4532 220 krummy-lavacrypt-gfhd.exe cmd.exe PID 220 wrote to memory of 4532 220 krummy-lavacrypt-gfhd.exe cmd.exe PID 220 wrote to memory of 1208 220 krummy-lavacrypt-gfhd.exe cmd.exe PID 220 wrote to memory of 1208 220 krummy-lavacrypt-gfhd.exe cmd.exe PID 1208 wrote to memory of 4104 1208 cmd.exe timeout.exe PID 1208 wrote to memory of 4104 1208 cmd.exe timeout.exe PID 4532 wrote to memory of 1920 4532 cmd.exe schtasks.exe PID 4532 wrote to memory of 1920 4532 cmd.exe schtasks.exe PID 1208 wrote to memory of 4900 1208 cmd.exe svchost.exe PID 1208 wrote to memory of 4900 1208 cmd.exe svchost.exe PID 4900 wrote to memory of 1104 4900 svchost.exe powershell.exe PID 4900 wrote to memory of 1104 4900 svchost.exe powershell.exe PID 4900 wrote to memory of 920 4900 svchost.exe msbuild.exe PID 4900 wrote to memory of 920 4900 svchost.exe msbuild.exe PID 4900 wrote to memory of 920 4900 svchost.exe msbuild.exe PID 4900 wrote to memory of 920 4900 svchost.exe msbuild.exe PID 4900 wrote to memory of 920 4900 svchost.exe msbuild.exe PID 4900 wrote to memory of 920 4900 svchost.exe msbuild.exe PID 4900 wrote to memory of 920 4900 svchost.exe msbuild.exe PID 4900 wrote to memory of 920 4900 svchost.exe msbuild.exe PID 920 wrote to memory of 1092 920 msbuild.exe Client.exe PID 920 wrote to memory of 1092 920 msbuild.exe Client.exe PID 920 wrote to memory of 1092 920 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
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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
PID:220 -
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:4532 -
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:1920 -
C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp594B.tmp.bat""2⤵
- Suspicious use of WriteProcessMemory
PID:1208 -
C:\Windows\system32\timeout.exetimeout 33⤵
- Delays execution with timeout.exe
PID:4104 -
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
PID:4900 -
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:1104 -
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:920 -
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"5⤵
- Executes dropped EXE
PID:1092
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
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C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_th5eme4j.b41.ps1Filesize
60B
MD5d17fe0a3f47be24a6453e9ef58c94641
SHA16ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA25696ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA5125b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
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C:\Users\Admin\AppData\Local\Temp\tmp594B.tmp.batFilesize
151B
MD55e160587615b1f63ab6dd62673f70926
SHA11f8260e997265444e7e732eb8d93e26aa009cc02
SHA2561dce9844e39659f3121052a19848510a4ed6f63e29061e101bc23f861edc22f1
SHA5126c54ca791910e3ca4f743298175ef2b8a31a2d4fe68eb8ed4af83cc6e02c9ce8a65d42a4177753d4ad741d21e44bf68c0e241ded4fc1b8ad0d312fb1a9f2a67d
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exeFilesize
256KB
MD58fdf47e0ff70c40ed3a17014aeea4232
SHA1e6256a0159688f0560b015da4d967f41cbf8c9bd
SHA256ed9884bac608c06b7057037cc91d90e4ae5f74dd2dbce2af476699c6d4492d82
SHA512bd69d092ed4f9c5e1f24eaf5ec79fb316469d53849dc798fae0fcba5e90869b77ee924c23cc6f692198ff25827ab60ad47bb46cadd6e0aadde7731cbafb013be
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C:\Users\Admin\AppData\Roaming\svchost.exeFilesize
3.5MB
MD5af1082c667a09a0f1f6adb041ca37d34
SHA1ccb770b00596a1d2fa0d9d7d3dbe9451734a30f9
SHA25628b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6
SHA5124d1c50b42077ec0a8f0060410e75201e920b951f299e8d9a247fb4ba3c920ef5d16f7b30e2decef5323d88e28e3daeee60ae3fcd1e00de36e0185336b1582404
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memory/220-1-0x00007FFE2D560000-0x00007FFE2E021000-memory.dmpFilesize
10.8MB
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memory/220-2-0x000001D3C4F10000-0x000001D3C4F20000-memory.dmpFilesize
64KB
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memory/220-3-0x000001D3DD7D0000-0x000001D3DDB48000-memory.dmpFilesize
3.5MB
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memory/220-8-0x00007FFE2D560000-0x00007FFE2E021000-memory.dmpFilesize
10.8MB
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memory/220-0-0x000001D3C3360000-0x000001D3C3368000-memory.dmpFilesize
32KB
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memory/920-27-0x0000000074F70000-0x0000000075720000-memory.dmpFilesize
7.7MB
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memory/920-32-0x0000000005250000-0x0000000005260000-memory.dmpFilesize
64KB
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memory/920-44-0x0000000074F70000-0x0000000075720000-memory.dmpFilesize
7.7MB
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memory/920-31-0x0000000005210000-0x000000000521A000-memory.dmpFilesize
40KB
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memory/920-28-0x00000000056B0000-0x0000000005C54000-memory.dmpFilesize
5.6MB
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memory/920-14-0x0000000000400000-0x0000000000724000-memory.dmpFilesize
3.1MB
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memory/920-30-0x0000000005260000-0x00000000052F2000-memory.dmpFilesize
584KB
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memory/1092-43-0x00000000005F0000-0x0000000000630000-memory.dmpFilesize
256KB
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memory/1092-50-0x0000000074F70000-0x0000000075720000-memory.dmpFilesize
7.7MB
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memory/1092-48-0x0000000004F70000-0x0000000004F80000-memory.dmpFilesize
64KB
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memory/1092-47-0x00000000050E0000-0x000000000523A000-memory.dmpFilesize
1.4MB
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memory/1092-46-0x0000000004E10000-0x0000000004E2A000-memory.dmpFilesize
104KB
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memory/1092-45-0x0000000074F70000-0x0000000075720000-memory.dmpFilesize
7.7MB
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memory/1104-35-0x00007FFE2D280000-0x00007FFE2DD41000-memory.dmpFilesize
10.8MB
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memory/1104-25-0x000002693FFB0000-0x000002693FFC0000-memory.dmpFilesize
64KB
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memory/1104-29-0x000002693FFB0000-0x000002693FFC0000-memory.dmpFilesize
64KB
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memory/1104-20-0x00007FFE2D280000-0x00007FFE2DD41000-memory.dmpFilesize
10.8MB
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memory/1104-26-0x000002693FF80000-0x000002693FFA2000-memory.dmpFilesize
136KB
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memory/4900-13-0x00007FFE2D280000-0x00007FFE2DD41000-memory.dmpFilesize
10.8MB
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memory/4900-36-0x00007FFE2D280000-0x00007FFE2DD41000-memory.dmpFilesize
10.8MB