xworm | 2a03094b59e5dbc2e69fa76f01a35c58fb5466c9b47b87d621fb26b0b037ee59

Reason

Machine shutdown

General

Target

SolaraBootstrapper.exe
Size

266KB
MD5

bfea4fbe1ad2dc882c79c09f103fd395
SHA1

48d80787945fc1355ce97ab5dc795cf0e7b25f01
SHA256

2a03094b59e5dbc2e69fa76f01a35c58fb5466c9b47b87d621fb26b0b037ee59
SHA512

2043da716ff26e1fa635a2e13e2191e04c2713ae05eca35540d4148dfbcd2ced76ec977419c10c7d164b1fc0336cad4d7c70267307169aae50c4577484b4204f
SSDEEP

3072:xnkK65+bdKBfKOwcliLvAzII9x66AOag74srxxVfPWKvQIFY623:xndbbwxPqONxTGqQI+62

Score

10^/10

xworm bootkit discovery execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

18.ip.gl.ply.gg:19043

Attributes

Install_directory
%AppData%
install_file
svchost.exe

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral1/memory/1940-1-0x0000000000110000-0x0000000000158000-memory.dmp	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm
Xworm family
xworm

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
2828	powershell.exe
2776	powershell.exe
2812	powershell.exe
1824	powershell.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\svchost.lnk	SolaraBootstrapper.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\svchost.lnk	SolaraBootstrapper.exe

Executes dropped EXE 2 IoCs

pid	Process
1788	tyfokx.exe
324	sys3.exe

Loads dropped DLL 2 IoCs

pid	Process
1788	tyfokx.exe
1788	tyfokx.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-312935884-697965778-3955649944-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchost = "C:\\Users\\Admin\\AppData\\Roaming\\svchost.exe"	SolaraBootstrapper.exe

Writes to the Master Boot Record (MBR) 1 TTPs 2 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1542.003

description	ioc	Process
File opened for modification	\??\PHYSICALDRIVE0	tyfokx.exe
File opened for modification	\??\PHYSICALDRIVE0	sys3.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 2 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	tyfokx.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sys3.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2828	powershell.exe
2776	powershell.exe
2812	powershell.exe
1824	powershell.exe
1940	SolaraBootstrapper.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	1940	SolaraBootstrapper.exe
Token: SeDebugPrivilege	2828	powershell.exe
Token: SeDebugPrivilege	2776	powershell.exe
Token: SeDebugPrivilege	2812	powershell.exe
Token: SeDebugPrivilege	1824	powershell.exe
Token: SeDebugPrivilege	1940	SolaraBootstrapper.exe
Token: SeShutdownPrivilege	324	sys3.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1940	SolaraBootstrapper.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 1940 wrote to memory of 2828	1940	SolaraBootstrapper.exe	31
PID 1940 wrote to memory of 2828	1940	SolaraBootstrapper.exe	31
PID 1940 wrote to memory of 2828	1940	SolaraBootstrapper.exe	31
PID 1940 wrote to memory of 2776	1940	SolaraBootstrapper.exe	33
PID 1940 wrote to memory of 2776	1940	SolaraBootstrapper.exe	33
PID 1940 wrote to memory of 2776	1940	SolaraBootstrapper.exe	33
PID 1940 wrote to memory of 2812	1940	SolaraBootstrapper.exe	35
PID 1940 wrote to memory of 2812	1940	SolaraBootstrapper.exe	35
PID 1940 wrote to memory of 2812	1940	SolaraBootstrapper.exe	35
PID 1940 wrote to memory of 1824	1940	SolaraBootstrapper.exe	37
PID 1940 wrote to memory of 1824	1940	SolaraBootstrapper.exe	37
PID 1940 wrote to memory of 1824	1940	SolaraBootstrapper.exe	37
PID 1940 wrote to memory of 1788	1940	SolaraBootstrapper.exe	40
PID 1940 wrote to memory of 1788	1940	SolaraBootstrapper.exe	40
PID 1940 wrote to memory of 1788	1940	SolaraBootstrapper.exe	40
PID 1940 wrote to memory of 1788	1940	SolaraBootstrapper.exe	40
PID 1788 wrote to memory of 324	1788	tyfokx.exe	41
PID 1788 wrote to memory of 324	1788	tyfokx.exe	41
PID 1788 wrote to memory of 324	1788	tyfokx.exe	41
PID 1788 wrote to memory of 324	1788	tyfokx.exe	41

C:\Users\Admin\AppData\Local\Temp\SolaraBootstrapper.exe
"C:\Users\Admin\AppData\Local\Temp\SolaraBootstrapper.exe"
1⤵
- Drops startup file
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1940
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\SolaraBootstrapper.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2828
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'SolaraBootstrapper.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2776
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Roaming\svchost.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2812
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'svchost.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1824
- C:\Users\Admin\AppData\Local\Temp\tyfokx.exe
  "C:\Users\Admin\AppData\Local\Temp\tyfokx.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Writes to the Master Boot Record (MBR)
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1788
- - C:\Users\Admin\AppData\Local\Temp\sys3.exe
    C:\Users\Admin\AppData\Local\Temp\\sys3.exe
    3⤵
    - Executes dropped EXE
    - Writes to the Master Boot Record (MBR)
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:324

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x0
1⤵
PID:376

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x1
1⤵
PID:2420

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\systm.txt

Filesize
44B

MD5
d6654fdeec01a7b74594e70b86b6ec6b

SHA1
4f9e90d4989e88eef38222f9c7274cd08ab15bef

SHA256
90c0bf435c26d1b56e7cc322b0d9611c4c89a0552eca675339b11501c06de39e

SHA512
cd561375b0d2b77f4aae38343dccadf912a3ecea846263be28873ac76c4dbea1dc0f51dec960c426310f9f2bccc2c6638515fc29904e21394f2a71fdaf8cb1ae

Download Submit
C:\Users\Admin\AppData\Local\Temp\tyfokx.exe

Filesize
10KB

MD5
5a5f0a3c2302e091d81dc7eaf93d1460

SHA1
35b121df3e84bcc147e0ef9bb26878f8c8327066

SHA256
d14f18e6a192a359e6767600af028668729d6b6e569a66222cf3a4363ad8a608

SHA512
7b53479ab5c912fc13abd5d3b841eee216dc258f1adb62fdc74b1cf1a2f3d9dfcec520ab58dc7214bb31ba2b2f081e43deab66d33edc48e321c68587bb913541

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
e7506c1229c7f6b962e8335bfd910f3f

SHA1
49541c5c91b1bfb69516e438b2b7671792f58cb6

SHA256
610870eab733d0fdf1352e82f47e49e348a92d37887418add2917bec9b99651d

SHA512
9c9fca1ab81e8d3369be67f583be56b2d64179d04dd57e8a88aa99598ac499681c605d1b8201c6c4478bc4256905f4aeec67d63cdbab646b09b59f746c1bf7f3

Download Submit
memory/1788-41-0x000000002AA00000-0x000000002AA05000-memory.dmp

Filesize
20KB

Download
memory/1788-51-0x000000002AA00000-0x000000002AA05000-memory.dmp

Filesize
20KB

Download
memory/1940-0-0x000007FEF55E3000-0x000007FEF55E4000-memory.dmp

Filesize
4KB

Download
memory/1940-31-0x000000001B2A0000-0x000000001B320000-memory.dmp

Filesize
512KB

Download
memory/1940-32-0x000007FEF55E3000-0x000007FEF55E4000-memory.dmp

Filesize
4KB

Download
memory/1940-33-0x000000001B2A0000-0x000000001B320000-memory.dmp

Filesize
512KB

Download
memory/1940-1-0x0000000000110000-0x0000000000158000-memory.dmp

Filesize
288KB

Download
memory/2776-14-0x000000001B680000-0x000000001B962000-memory.dmp

Filesize
2.9MB

Download
memory/2776-15-0x00000000026A0000-0x00000000026A8000-memory.dmp

Filesize
32KB

Download
memory/2828-8-0x0000000002960000-0x0000000002968000-memory.dmp

Filesize
32KB

Download
memory/2828-7-0x000000001B4F0000-0x000000001B7D2000-memory.dmp

Filesize
2.9MB

Download
memory/2828-6-0x0000000002980000-0x0000000002A00000-memory.dmp

Filesize
512KB

Download

Analysis

Sharing

Errors

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads