servhelper | 82285ac0988c68f9b9ecc7649cb9c6a3f3ecb242dd198465dbd4236d7fa6a59c

Analysis

max time kernel
116s
max time network
152s
platform
windows10_x64
resource
win10-en-20210920
submitted
26-09-2021 15:03

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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 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 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

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

T1112

pid	Process
3248	reg.exe

Runs net.exe

Suspicious behavior: EnumeratesProcesses 15 IoCs

pid	Process
2612	powershell.exe
2612	powershell.exe
2612	powershell.exe
3628	powershell.exe
3628	powershell.exe
3628	powershell.exe
512	powershell.exe
512	powershell.exe
512	powershell.exe
3952	powershell.exe
3952	powershell.exe
3952	powershell.exe
2612	powershell.exe
2612	powershell.exe
2612	powershell.exe

Suspicious behavior: LoadsDriver 1 IoCs

pid	Process
624	Process not Found

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	2612	powershell.exe
Token: SeDebugPrivilege	3628	powershell.exe
Token: SeDebugPrivilege	512	powershell.exe
Token: SeDebugPrivilege	3952	powershell.exe

Suspicious use of WriteProcessMemory 63 IoCs

description	pid	Process	procid_target
PID 2412 wrote to memory of 2612	2412	748b112881047820f530c202bb59488e.exe	71
PID 2412 wrote to memory of 2612	2412	748b112881047820f530c202bb59488e.exe	71
PID 2412 wrote to memory of 2612	2412	748b112881047820f530c202bb59488e.exe	71
PID 2612 wrote to memory of 4056	2612	powershell.exe	73
PID 2612 wrote to memory of 4056	2612	powershell.exe	73
PID 2612 wrote to memory of 4056	2612	powershell.exe	73
PID 4056 wrote to memory of 2912	4056	csc.exe	74
PID 4056 wrote to memory of 2912	4056	csc.exe	74
PID 4056 wrote to memory of 2912	4056	csc.exe	74
PID 2612 wrote to memory of 3628	2612	powershell.exe	75
PID 2612 wrote to memory of 3628	2612	powershell.exe	75
PID 2612 wrote to memory of 3628	2612	powershell.exe	75
PID 2612 wrote to memory of 512	2612	powershell.exe	77
PID 2612 wrote to memory of 512	2612	powershell.exe	77
PID 2612 wrote to memory of 512	2612	powershell.exe	77
PID 2612 wrote to memory of 3952	2612	powershell.exe	79
PID 2612 wrote to memory of 3952	2612	powershell.exe	79
PID 2612 wrote to memory of 3952	2612	powershell.exe	79
PID 2612 wrote to memory of 640	2612	powershell.exe	81
PID 2612 wrote to memory of 640	2612	powershell.exe	81
PID 2612 wrote to memory of 640	2612	powershell.exe	81
PID 2612 wrote to memory of 3248	2612	powershell.exe	82
PID 2612 wrote to memory of 3248	2612	powershell.exe	82
PID 2612 wrote to memory of 3248	2612	powershell.exe	82
PID 2612 wrote to memory of 1340	2612	powershell.exe	83
PID 2612 wrote to memory of 1340	2612	powershell.exe	83
PID 2612 wrote to memory of 1340	2612	powershell.exe	83
PID 2612 wrote to memory of 1676	2612	powershell.exe	84
PID 2612 wrote to memory of 1676	2612	powershell.exe	84
PID 2612 wrote to memory of 1676	2612	powershell.exe	84
PID 1676 wrote to memory of 1796	1676	net.exe	85
PID 1676 wrote to memory of 1796	1676	net.exe	85
PID 1676 wrote to memory of 1796	1676	net.exe	85
PID 2612 wrote to memory of 2588	2612	powershell.exe	86
PID 2612 wrote to memory of 2588	2612	powershell.exe	86
PID 2612 wrote to memory of 2588	2612	powershell.exe	86
PID 2588 wrote to memory of 3856	2588	cmd.exe	87
PID 2588 wrote to memory of 3856	2588	cmd.exe	87
PID 2588 wrote to memory of 3856	2588	cmd.exe	87
PID 3856 wrote to memory of 2636	3856	cmd.exe	88
PID 3856 wrote to memory of 2636	3856	cmd.exe	88
PID 3856 wrote to memory of 2636	3856	cmd.exe	88
PID 2636 wrote to memory of 3052	2636	net.exe	89
PID 2636 wrote to memory of 3052	2636	net.exe	89
PID 2636 wrote to memory of 3052	2636	net.exe	89
PID 2612 wrote to memory of 2864	2612	powershell.exe	90
PID 2612 wrote to memory of 2864	2612	powershell.exe	90
PID 2612 wrote to memory of 2864	2612	powershell.exe	90
PID 2864 wrote to memory of 3836	2864	cmd.exe	91
PID 2864 wrote to memory of 3836	2864	cmd.exe	91
PID 2864 wrote to memory of 3836	2864	cmd.exe	91
PID 3836 wrote to memory of 3840	3836	cmd.exe	92
PID 3836 wrote to memory of 3840	3836	cmd.exe	92
PID 3836 wrote to memory of 3840	3836	cmd.exe	92
PID 3840 wrote to memory of 3296	3840	net.exe	93
PID 3840 wrote to memory of 3296	3840	net.exe	93
PID 3840 wrote to memory of 3296	3840	net.exe	93
PID 2612 wrote to memory of 916	2612	powershell.exe	95
PID 2612 wrote to memory of 916	2612	powershell.exe	95
PID 2612 wrote to memory of 916	2612	powershell.exe	95
PID 2612 wrote to memory of 1312	2612	powershell.exe	96
PID 2612 wrote to memory of 1312	2612	powershell.exe	96
PID 2612 wrote to memory of 1312	2612	powershell.exe	96

C:\Users\Admin\AppData\Local\Temp\748b112881047820f530c202bb59488e.exe
"C:\Users\Admin\AppData\Local\Temp\748b112881047820f530c202bb59488e.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2412
- 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:2612
- - 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\wgsr5gx1\wgsr5gx1.cmdline"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4056
  - - 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\RESB2CB.tmp" "c:\Users\Admin\AppData\Local\Temp\wgsr5gx1\CSC25A62393E6D843C397C3F863D8835D3E.TMP"
      4⤵
      PID:2912
- - 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:3628
- - 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:512
- - 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:3952
- - 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:640
- - 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:3248
- - 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:1340
- - C:\Windows\SysWOW64\net.exe
    "C:\Windows\system32\net.exe" localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1676
  - - C:\Windows\SysWOW64\net1.exe
      C:\Windows\system32\net1 localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add
      4⤵
      PID:1796
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\system32\cmd.exe" /c cmd /c net start rdpdr
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2588
  - - C:\Windows\SysWOW64\cmd.exe
      cmd /c net start rdpdr
      4⤵
      Suspicious use of WriteProcessMemory
      PID:3856
    - - C:\Windows\SysWOW64\net.exe
        
        net start rdpdr
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:2636
      - C:\Windows\SysWOW64\net1.exe
        
        C:\Windows\system32\net1 start rdpdr
        6⤵
        
        PID:3052
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\system32\cmd.exe" /c cmd /c net start TermService
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2864
  - - C:\Windows\SysWOW64\cmd.exe
      cmd /c net start TermService
      4⤵
      Suspicious use of WriteProcessMemory
      PID:3836
    - - C:\Windows\SysWOW64\net.exe
        
        net start TermService
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:3840
      - C:\Windows\SysWOW64\net1.exe
        
        C:\Windows\system32\net1 start TermService
        6⤵
        
        PID:3296
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\system32\cmd.exe" /c del %temp%\*.ps1 /f
    3⤵
    PID:916
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\system32\cmd.exe" /c del %temp%\*.txt /f
    3⤵
    PID:1312

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/512-442-0x0000000006722000-0x0000000006723000-memory.dmp

Filesize
4KB

Download
memory/512-440-0x0000000006720000-0x0000000006721000-memory.dmp

Filesize
4KB

Download
memory/512-467-0x000000007EF60000-0x000000007EF61000-memory.dmp

Filesize
4KB

Download
memory/2412-121-0x00000000010E0000-0x00000000010E1000-memory.dmp

Filesize
4KB

Download
memory/2412-119-0x0000000005BA0000-0x0000000005BA1000-memory.dmp

Filesize
4KB

Download
memory/2412-120-0x0000000005840000-0x0000000005841000-memory.dmp

Filesize
4KB

Download
memory/2412-123-0x0000000000303000-0x0000000000304000-memory.dmp

Filesize
4KB

Download
memory/2412-118-0x0000000000302000-0x0000000000303000-memory.dmp

Filesize
4KB

Download
memory/2412-117-0x0000000000300000-0x0000000000301000-memory.dmp

Filesize
4KB

Download
memory/2412-122-0x0000000007CE0000-0x0000000007CE1000-memory.dmp

Filesize
4KB

Download
memory/2412-124-0x0000000000304000-0x0000000000305000-memory.dmp

Filesize
4KB

Download
memory/2412-115-0x00000000052A0000-0x000000000569F000-memory.dmp

Filesize
4.0MB

Download
memory/2612-131-0x0000000007F80000-0x0000000007F81000-memory.dmp

Filesize
4KB

Download
memory/2612-144-0x0000000009F50000-0x0000000009F51000-memory.dmp

Filesize
4KB

Download
memory/2612-153-0x0000000007460000-0x0000000007461000-memory.dmp

Filesize
4KB

Download
memory/2612-128-0x0000000005180000-0x0000000005181000-memory.dmp

Filesize
4KB

Download
memory/2612-155-0x0000000005133000-0x0000000005134000-memory.dmp

Filesize
4KB

Download
memory/2612-176-0x0000000009A30000-0x0000000009A31000-memory.dmp

Filesize
4KB

Download
memory/2612-129-0x0000000007800000-0x0000000007801000-memory.dmp

Filesize
4KB

Download
memory/2612-135-0x0000000005132000-0x0000000005133000-memory.dmp

Filesize
4KB

Download
memory/2612-130-0x0000000007EE0000-0x0000000007EE1000-memory.dmp

Filesize
4KB

Download
memory/2612-136-0x0000000008050000-0x0000000008051000-memory.dmp

Filesize
4KB

Download
memory/2612-137-0x0000000008A90000-0x0000000008A91000-memory.dmp

Filesize
4KB

Download
memory/2612-138-0x0000000008930000-0x0000000008931000-memory.dmp

Filesize
4KB

Download
memory/2612-133-0x0000000008240000-0x0000000008241000-memory.dmp

Filesize
4KB

Download
memory/2612-134-0x0000000005130000-0x0000000005131000-memory.dmp

Filesize
4KB

Download
memory/2612-1124-0x000000007ED20000-0x000000007ED21000-memory.dmp

Filesize
4KB

Download
memory/2612-145-0x0000000009670000-0x0000000009671000-memory.dmp

Filesize
4KB

Download
memory/3628-212-0x000000007F090000-0x000000007F091000-memory.dmp

Filesize
4KB

Download
memory/3628-182-0x0000000005090000-0x0000000005091000-memory.dmp

Filesize
4KB

Download
memory/3628-183-0x0000000005092000-0x0000000005093000-memory.dmp

Filesize
4KB

Download
memory/3628-198-0x0000000008CA0000-0x0000000008CD3000-memory.dmp

Filesize
204KB

Download
memory/3628-412-0x0000000008F20000-0x0000000008F21000-memory.dmp

Filesize
4KB

Download
memory/3628-406-0x0000000008F30000-0x0000000008F31000-memory.dmp

Filesize
4KB

Download
memory/3628-213-0x0000000008F90000-0x0000000008F91000-memory.dmp

Filesize
4KB

Download
memory/3628-206-0x0000000008C80000-0x0000000008C81000-memory.dmp

Filesize
4KB

Download
memory/3628-211-0x0000000008DE0000-0x0000000008DE1000-memory.dmp

Filesize
4KB

Download
memory/3952-723-0x000000007F7B0000-0x000000007F7B1000-memory.dmp

Filesize
4KB

Download
memory/3952-699-0x0000000006C22000-0x0000000006C23000-memory.dmp

Filesize
4KB

Download
memory/3952-698-0x0000000006C20000-0x0000000006C21000-memory.dmp

Filesize
4KB

Download