xworm | 33a182216fc7373b3a6bd7f0072d2be15dda0be8d87ab7cdb5efd059814a0bf6

General

Target

XClient.exe
Size

181KB
MD5

54be25948cde668a9f0a31efbea79238
SHA1

e00cd0d4865b2fc3805803c1c5450d07907b3aec
SHA256

33a182216fc7373b3a6bd7f0072d2be15dda0be8d87ab7cdb5efd059814a0bf6
SHA512

6813b95fc6736d12bd070afadd4db12bdde00f54423315ba21f2522f5893d095f41930509a5b91b20ee3f74af5ff39598b2ec87cad4439745a15ddba30a477bb
SSDEEP

3072:axyAX+bsg/AfwIOdNMf8+4NpVq8BxFRzaqF+o2GQJ7/JzqVfGvp:yub/4aB+gVqwlL

Score

10^/10

xworm evasion execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Attributes

Install_directory
%AppData%
install_file
XClient.exe
pastebin_url
https://pastebin.com/raw/Xei4S8Yz

Signatures

Contains code to disable Windows Defender 1 IoCs

A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

resource	yara_rule
behavioral1/memory/3980-56-0x000000001CEF0000-0x000000001CEFE000-memory.dmp	disable_win_def

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral1/memory/3980-1-0x0000000000B00000-0x0000000000B34000-memory.dmp	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat 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
3320	powershell.exe
2984	powershell.exe
4092	powershell.exe
3196	powershell.exe

Disables RegEdit via registry modification 2 IoCs

evasion

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-2551177587-3778486488-1329702901-1000\Software\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "0"	XClient.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2551177587-3778486488-1329702901-1000\Software\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	XClient.exe

Disables Task Manager via registry modification
evasion

Modifies Windows Firewall 2 TTPs 1 IoCs

evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
3456	netsh.exe

Drops startup file 2 IoCs

description	ioc	Process
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\XClient.lnk	XClient.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\XClient.lnk	XClient.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-1-5-21-2551177587-3778486488-1329702901-1000\Software\Microsoft\Windows\CurrentVersion\Run\XClient = "C:\\Users\\Admin\\AppData\\Roaming\\XClient.exe"	XClient.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
1	pastebin.com
2	pastebin.com

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

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	XClient.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	XClient.exe

Enumerates system info in registry 2 TTPs 4 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\BIOSVersion	XClient.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\BIOSReleaseDate	XClient.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemProductName	XClient.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS	XClient.exe

Suspicious behavior: EnumeratesProcesses 39 IoCs

pid	Process
4092	powershell.exe
4092	powershell.exe
3196	powershell.exe
3196	powershell.exe
3320	powershell.exe
3320	powershell.exe
2984	powershell.exe
2984	powershell.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe
3980	XClient.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	3980	XClient.exe
Token: SeDebugPrivilege	4092	powershell.exe
Token: SeDebugPrivilege	3196	powershell.exe
Token: SeDebugPrivilege	3320	powershell.exe
Token: SeDebugPrivilege	2984	powershell.exe
Token: SeDebugPrivilege	3980	XClient.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3980	XClient.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 3980 wrote to memory of 4092	3980	XClient.exe	76
PID 3980 wrote to memory of 4092	3980	XClient.exe	76
PID 3980 wrote to memory of 3196	3980	XClient.exe	78
PID 3980 wrote to memory of 3196	3980	XClient.exe	78
PID 3980 wrote to memory of 3320	3980	XClient.exe	80
PID 3980 wrote to memory of 3320	3980	XClient.exe	80
PID 3980 wrote to memory of 2984	3980	XClient.exe	82
PID 3980 wrote to memory of 2984	3980	XClient.exe	82
PID 3980 wrote to memory of 3456	3980	XClient.exe	85
PID 3980 wrote to memory of 3456	3980	XClient.exe	85
PID 3980 wrote to memory of 4812	3980	XClient.exe	87
PID 3980 wrote to memory of 4812	3980	XClient.exe	87

C:\Users\Admin\AppData\Local\Temp\XClient.exe
"C:\Users\Admin\AppData\Local\Temp\XClient.exe"
1⤵
- Disables RegEdit via registry modification
- Drops startup file
- Adds Run key to start application
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3980
- 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\XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4092
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3196
- 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\XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3320
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2984
- C:\Windows\System32\netsh.exe
  "C:\Windows\System32\netsh.exe" advfirewall set allprofiles state on
  2⤵
  - Modifies Windows Firewall
  PID:3456
- C:\Windows\SYSTEM32\CMD.EXE
  "CMD.EXE"
  2⤵
  PID:4812

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

Create or Modify System Process

1

T1543

Windows Service

1

T1543.003

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Create or Modify System Process

1

T1543

Windows Service

1

T1543.003

Defense Evasion

Impair Defenses

1

T1562

Disable or Modify System Firewall

Modify Registry

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

3

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
627073ee3ca9676911bee35548eff2b8

SHA1
4c4b68c65e2cab9864b51167d710aa29ebdcff2e

SHA256
85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c

SHA512
3c5f6c03e253b83c57e8d6f0334187dbdcdf4fa549eecd36cbc1322dca6d3ca891dc6a019c49ec2eafb88f82d0434299c31e4dfaab123acb42e0546218f311fb

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
1a9fa92a4f2e2ec9e244d43a6a4f8fb9

SHA1
9910190edfaccece1dfcc1d92e357772f5dae8f7

SHA256
0ee052d5333fd5fd86bc84856fec98e045f077a7ac8051651bf7c521b9706888

SHA512
5d2361476fa22200e6f83883efe7dcb8c3fe7dae8d56e04e28a36e9ae1270c327b6aa161d92b239593da7661289d002c574446ecfd6bd19928209aae25e3ef64

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
cef328ddb1ee8916e7a658919323edd8

SHA1
a676234d426917535e174f85eabe4ef8b88256a5

SHA256
a1b5b7ada8ebc910f20f91ada3991d3321104e9da598c958b1edac9f9aca0e90

SHA512
747400c20ca5b5fd1b54bc24e75e6a78f15af61df263be932d2ee7b2f34731c2de8ce03b2706954fb098c1ac36f0b761cf37e418738fa91f2a8ea78572f545cb

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
34c8b93dd58a4703db0d6dd86bb21d70

SHA1
b53aa49b882070b857951b6638d6da3a03ac2f56

SHA256
34b95e4d12196f68f7a030b98190fda89c34b696251ab9ed831e48d983896898

SHA512
bba4a86b8a66104ed21fd58717168cdf68b93c801a94ec65e25c2b66c1b9354b9e7c1c01cadde451948e072d96c3fa4994c94ef33aeff9b603e7b5d82f7111e7

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_czjmjz4o.guk.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/3980-55-0x000000001CF30000-0x000000001CF3C000-memory.dmp

Filesize
48KB

Download
memory/3980-59-0x00000000013F0000-0x00000000013FA000-memory.dmp

Filesize
40KB

Download
memory/3980-69-0x00000000013D0000-0x00000000013DA000-memory.dmp

Filesize
40KB

Download
memory/3980-61-0x000000001F000000-0x000000001F528000-memory.dmp

Filesize
5.2MB

Download
memory/3980-60-0x00000000013B0000-0x00000000013BC000-memory.dmp

Filesize
48KB

Download
memory/3980-57-0x00007FFE88010000-0x00007FFE88AD2000-memory.dmp

Filesize
10.8MB

Download
memory/3980-56-0x000000001CEF0000-0x000000001CEFE000-memory.dmp

Filesize
56KB

Download
memory/3980-1-0x0000000000B00000-0x0000000000B34000-memory.dmp

Filesize
208KB

Download
memory/3980-53-0x00007FFE88010000-0x00007FFE88AD2000-memory.dmp

Filesize
10.8MB

Download
memory/3980-54-0x00007FFE88013000-0x00007FFE88015000-memory.dmp

Filesize
8KB

Download
memory/3980-0-0x00007FFE88013000-0x00007FFE88015000-memory.dmp

Filesize
8KB

Download
memory/4092-8-0x000002EA5B330000-0x000002EA5B352000-memory.dmp

Filesize
136KB

Download
memory/4092-11-0x00007FFE88010000-0x00007FFE88AD2000-memory.dmp

Filesize
10.8MB

Download
memory/4092-13-0x00007FFE88010000-0x00007FFE88AD2000-memory.dmp

Filesize
10.8MB

Download
memory/4092-12-0x00007FFE88010000-0x00007FFE88AD2000-memory.dmp

Filesize
10.8MB

Download
memory/4092-17-0x00007FFE88010000-0x00007FFE88AD2000-memory.dmp

Filesize
10.8MB

Download
memory/4092-14-0x00007FFE88010000-0x00007FFE88AD2000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads