xworm | b41f48f860bd9d992029986c081ca5ddbb3adf91910bf11aee9af8606829e2a3

General

Target

XClient.exe
Size

184KB
MD5

1e8e3d1ea4d6a65d0207186979832cb9
SHA1

9c4626b99ede4ea3ea2a746d2e687caf9955698c
SHA256

b41f48f860bd9d992029986c081ca5ddbb3adf91910bf11aee9af8606829e2a3
SHA512

8e9a7c62c17274ba0956bf066eea75ce79466d8e04a53fda0176834dced8e97f9da4075bcc6b5f7bde78323ce9bb183878b28b95f1ba255a2a1d1676642a4edd
SSDEEP

3072:nKPGNe+bZnCRZOTkdl4NpVq8BxFRzaqF+o2GQJ7/JzqVfGvp:nKPCHbt0m+lgVqwlL

Score

10^/10

xworm 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

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral2/memory/428-1-0x0000000000910000-0x0000000000944000-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
4384	powershell.exe
2352	powershell.exe
468	powershell.exe
4112	powershell.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3558294865-3673844354-2255444939-1000\Control Panel\International\Geo\Nation	XClient.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\XClient.lnk	XClient.exe
File opened for modification	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-1-5-21-3558294865-3673844354-2255444939-1000\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 10 IoCs

Web Service

T1102

flow	ioc
18	pastebin.com
14	pastebin.com
5	pastebin.com
11	pastebin.com
13	pastebin.com
15	pastebin.com
16	pastebin.com
17	pastebin.com
19	pastebin.com
2	pastebin.com

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
468	powershell.exe
468	powershell.exe
4112	powershell.exe
4112	powershell.exe
4384	powershell.exe
4384	powershell.exe
2352	powershell.exe
2352	powershell.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	428	XClient.exe
Token: SeDebugPrivilege	468	powershell.exe
Token: SeDebugPrivilege	4112	powershell.exe
Token: SeDebugPrivilege	4384	powershell.exe
Token: SeDebugPrivilege	2352	powershell.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 428 wrote to memory of 468	428	XClient.exe	86
PID 428 wrote to memory of 468	428	XClient.exe	86
PID 428 wrote to memory of 4112	428	XClient.exe	88
PID 428 wrote to memory of 4112	428	XClient.exe	88
PID 428 wrote to memory of 4384	428	XClient.exe	90
PID 428 wrote to memory of 4384	428	XClient.exe	90
PID 428 wrote to memory of 2352	428	XClient.exe	92
PID 428 wrote to memory of 2352	428	XClient.exe	92

C:\Users\Admin\AppData\Local\Temp\XClient.exe
"C:\Users\Admin\AppData\Local\Temp\XClient.exe"
1⤵
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:428
- 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:468
- 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:4112
- 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:4384
- 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:2352

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

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

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

Filesize
944B

MD5
6d42b6da621e8df5674e26b799c8e2aa

SHA1
ab3ce1327ea1eeedb987ec823d5e0cb146bafa48

SHA256
5ab6a1726f425c6d0158f55eb8d81754ddedd51e651aa0a899a29b7a58619c4c

SHA512
53faffbda8a835bc1143e894c118c15901a5fd09cfc2224dd2f754c06dc794897315049a579b9a8382d4564f071576045aaaf824019b7139d939152dca38ce29

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

Filesize
944B

MD5
4970161af3af5fd3d0f5bdad3da90370

SHA1
6ed3452eeb4b2462580536bdc16eacac79ec633d

SHA256
fc139f174b19e9d14f22b77b3af02a7ac4f5a9bbcb2ca57a6a3831e4f160f2bd

SHA512
174e5af173ac84ecf69306c6e18b6c1c86968be5025d575499c0745e3d7ad77fbbf21268bfb65e7af7dcf1e7b05d64687112561ff772c7379bf7a345fe81eecd

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

Filesize
944B

MD5
4165c906a376e655973cef247b5128f1

SHA1
c6299b6ab8b2db841900de376e9c4d676d61131e

SHA256
fb0b3c822d300abbb892e6f218d6b4b62b80bb26d9184d1f4c731600053a3fc4

SHA512
15783f2d3687388339c06423bd18c17a5704cd367bf1a1d08e436088984c0b5c52dc88d3b8455495a8051ba9f977aae34b69453e5ee252d928e74dcdebd4a11a

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_f0sfw2rk.uga.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/428-0-0x00007FF8D81B3000-0x00007FF8D81B5000-memory.dmp

Filesize
8KB

Download
memory/428-1-0x0000000000910000-0x0000000000944000-memory.dmp

Filesize
208KB

Download
memory/428-57-0x00007FF8D81B0000-0x00007FF8D8C71000-memory.dmp

Filesize
10.8MB

Download
memory/428-58-0x00007FF8D81B0000-0x00007FF8D8C71000-memory.dmp

Filesize
10.8MB

Download
memory/468-13-0x00007FF8D81B0000-0x00007FF8D8C71000-memory.dmp

Filesize
10.8MB

Download
memory/468-14-0x00007FF8D81B0000-0x00007FF8D8C71000-memory.dmp

Filesize
10.8MB

Download
memory/468-17-0x00007FF8D81B0000-0x00007FF8D8C71000-memory.dmp

Filesize
10.8MB

Download
memory/468-12-0x00007FF8D81B0000-0x00007FF8D8C71000-memory.dmp

Filesize
10.8MB

Download
memory/468-2-0x000002905AC30000-0x000002905AC52000-memory.dmp

Filesize
136KB

Download
memory/2352-52-0x000001EDAF870000-0x000001EDAFA8C000-memory.dmp

Filesize
2.1MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads