loaderbot | 2eb0bae173c8d79bc9180db259f08700ace9992e23c8560c89d28e0080c4bcba

General

Target
$1/1337/NetFramework.exe
Size 1.3MB
Sample250910-ypfydaap4x
SHA256 0cc41dcf71bae5911647af1d05b61c118f4acb6d3aec8113a311c02c3ddf1082
MD5 6c986a80c8bbb19a08ead0758f23ccf7
SHA1 10b3fd235f0b55db3cb6f8c77c2fc846c24f8c4c
SHA512 29d0a01a194c10e423df0f53cdcf2273d9b22d2ffeb1d553efc1e8587d86666175d4ebee1310c711757e2fab554850def9944809c9e5d932f059492efd70df08
SSDEEP 24576:E/HBQ5M9JOfpZ3eNS/mLB/+WXCbpYc3/Ze781ZlJb8vAS5utIQrvi:E/Bd6Z3PcG04pjV1jJLS5uZrv
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

defense_evasion discovery execution loaderbot loader miner persistence

Malware Config

Extracted

Family

loaderbot

C2

http://sychost.com/cmd.php

Signatures

LoaderBot
LoaderBot is a loader written in .NET downloading and executing miners.
loader miner loaderbot
Loaderbot family
loaderbot

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 2 IoCs

defense_evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	NetFramework.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	NetFramework.exe

LoaderBot executable 5 IoCs

resource	yara_rule
behavioral2/memory/3640-1-0x00000000003F0000-0x0000000000774000-memory.dmp	loaderbot
behavioral2/memory/3640-2-0x00000000003F0000-0x0000000000774000-memory.dmp	loaderbot
behavioral2/memory/1704-7-0x00000000003F0000-0x0000000000774000-memory.dmp	loaderbot
behavioral2/memory/1704-6-0x00000000003F0000-0x0000000000774000-memory.dmp	loaderbot
behavioral2/memory/1704-10-0x00000000003F0000-0x0000000000774000-memory.dmp	loaderbot

Checks BIOS information in registry 2 TTPs 4 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	NetFramework.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	NetFramework.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	NetFramework.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	NetFramework.exe

Drops startup file 1 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Webhost.url	NetFramework.exe

Identifies Wine through registry keys 2 TTPs 2 IoCs

Wine is a compatibility layer capable of running Windows applications, which can be used as sandboxing environment.

defense_evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4097847965-469305640-2969917343-1000\Software\Wine	NetFramework.exe
Key opened	\REGISTRY\USER\S-1-5-21-4097847965-469305640-2969917343-1000\Software\Wine	NetFramework.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-4097847965-469305640-2969917343-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Webhost = "C:\\Users\\Admin\\AppData\\Roaming\\Windows\\NetFramework.exe"	NetFramework.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4097847965-469305640-2969917343-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Webhost = "C:\\Users\\Admin\\AppData\\Roaming\\Windows\\NetFramework.exe"	NetFramework.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
3640	NetFramework.exe
1704	NetFramework.exe

System Location Discovery: System Language Discovery 1 TTPs 6 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	NetFramework.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	NetFramework.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
2220	schtasks.exe
3512	schtasks.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
3640	NetFramework.exe
3640	NetFramework.exe
3640	NetFramework.exe
1704	NetFramework.exe
1704	NetFramework.exe
1704	NetFramework.exe

Suspicious behavior: RenamesItself 1 IoCs

pid	Process
3640	NetFramework.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3640	NetFramework.exe
Token: SeDebugPrivilege	1704	NetFramework.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3640 wrote to memory of 2980	3640	NetFramework.exe	85
PID 3640 wrote to memory of 2980	3640	NetFramework.exe	85
PID 3640 wrote to memory of 2980	3640	NetFramework.exe	85
PID 2980 wrote to memory of 2220	2980	cmd.exe	89
PID 2980 wrote to memory of 2220	2980	cmd.exe	89
PID 2980 wrote to memory of 2220	2980	cmd.exe	89
PID 1400 wrote to memory of 1704	1400	cmd.exe	90
PID 1400 wrote to memory of 1704	1400	cmd.exe	90
PID 1400 wrote to memory of 1704	1400	cmd.exe	90
PID 1704 wrote to memory of 1080	1704	NetFramework.exe	92
PID 1704 wrote to memory of 1080	1704	NetFramework.exe	92
PID 1704 wrote to memory of 1080	1704	NetFramework.exe	92
PID 1080 wrote to memory of 3512	1080	cmd.exe	94
PID 1080 wrote to memory of 3512	1080	cmd.exe	94
PID 1080 wrote to memory of 3512	1080	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\$1\1337\NetFramework.exe
"C:\Users\Admin\AppData\Local\Temp\$1\1337\NetFramework.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Drops startup file
- Identifies Wine through registry keys
- Adds Run key to start application
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: RenamesItself
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3640
- C:\Windows\SysWOW64\cmd.exe
  "cmd" /C schtasks /create /tn \System\SecurityServiceUpdate /tr %userprofile%\AppData\Roaming\Windows\NetFramework.exe /st 00:00 /du 9999:59 /sc daily /ri 5 /f
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2980
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /tn \System\SecurityServiceUpdate /tr C:\Users\Admin\AppData\Roaming\Windows\NetFramework.exe /st 00:00 /du 9999:59 /sc daily /ri 5 /f
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2220

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c C:\Users\Admin\AppData\Roaming\Windows\NetFramework.exe
1⤵
- Suspicious use of WriteProcessMemory
PID:1400
- C:\Users\Admin\AppData\Roaming\Windows\NetFramework.exe
  C:\Users\Admin\AppData\Roaming\Windows\NetFramework.exe
  2⤵
  - Identifies VirtualBox via ACPI registry values (likely anti-VM)
  - Checks BIOS information in registry
  - Identifies Wine through registry keys
  - Adds Run key to start application
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1704
- - C:\Windows\SysWOW64\cmd.exe
    "cmd" /C schtasks /create /tn \System\SecurityServiceUpdate /tr %userprofile%\AppData\Roaming\Windows\NetFramework.exe /st 00:00 /du 9999:59 /sc daily /ri 5 /f
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:1080
  - - C:\Windows\SysWOW64\schtasks.exe
      schtasks /create /tn \System\SecurityServiceUpdate /tr C:\Users\Admin\AppData\Roaming\Windows\NetFramework.exe /st 00:00 /du 9999:59 /sc daily /ri 5 /f
      4⤵
      System Location Discovery: System Language Discovery
      Scheduled Task/Job: Scheduled Task
      PID:3512