xworm | 3b9fd41558768c9ed809fdf54e199c260dc3ac39ea8320184f484890915fc457

General

Target

XClient.exe
Size

76KB
MD5

087b0c45aea1a937a396b5bb9dc02198
SHA1

1ccfa0318bd0cfe44b4bca3eeda92cb79c86f39f
SHA256

3b9fd41558768c9ed809fdf54e199c260dc3ac39ea8320184f484890915fc457
SHA512

42d5be800a60e95f15680682aac89d08fc86d04ecb579d89103559f720c2a40faa5a7d6416ed484c75a90e6be6ccc180758bca0727905c6f239273526fbfd9ff
SSDEEP

1536:ARCMExLHBP2ANHPxU+NGbFUi4esGTnlnr6CiJoBKOYm3u:qCMEvXBPxU+AbFUSQOYYu

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

89.213.177.81:7000

Attributes

Install_directory
%Public%
install_file
idk.exe

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral2/memory/4888-1-0x0000000000C40000-0x0000000000C5A000-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
1004	powershell.exe
4760	powershell.exe
3964	powershell.exe
5052	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-1-5-21-1403246978-718555486-3105247137-1000\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\idk.lnk	XClient.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\idk.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-1-5-21-1403246978-718555486-3105247137-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\idk = "C:\\Users\\Public\\idk.exe"	XClient.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
15	ip-api.com

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
1004	powershell.exe
1004	powershell.exe
4760	powershell.exe
4760	powershell.exe
3964	powershell.exe
3964	powershell.exe
5052	powershell.exe
5052	powershell.exe
4888	XClient.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	4888	XClient.exe
Token: SeDebugPrivilege	1004	powershell.exe
Token: SeDebugPrivilege	4760	powershell.exe
Token: SeDebugPrivilege	3964	powershell.exe
Token: SeDebugPrivilege	5052	powershell.exe
Token: SeDebugPrivilege	4888	XClient.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4888	XClient.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4888 wrote to memory of 1004	4888	XClient.exe	86
PID 4888 wrote to memory of 1004	4888	XClient.exe	86
PID 4888 wrote to memory of 4760	4888	XClient.exe	88
PID 4888 wrote to memory of 4760	4888	XClient.exe	88
PID 4888 wrote to memory of 3964	4888	XClient.exe	90
PID 4888 wrote to memory of 3964	4888	XClient.exe	90
PID 4888 wrote to memory of 5052	4888	XClient.exe	92
PID 4888 wrote to memory of 5052	4888	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 behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4888
- 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:1004
- 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:4760
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Public\idk.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3964
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'idk.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:5052

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

Exfiltration

Impact

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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
2979eabc783eaca50de7be23dd4eafcf

SHA1
d709ce5f3a06b7958a67e20870bfd95b83cad2ea

SHA256
006cca90e78fbb571532a83082ac6712721a34ea4b21f490058ffb3f521f4903

SHA512
92bc433990572d9427d0c93eef9bd1cc23fa00ed60dd0c9c983d87d3421e02ce3f156c6f88fe916ef6782dbf185cbce083bc0094f8c527f302be6a37d1c53aba

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

Filesize
944B

MD5
ce4540390cc4841c8973eb5a3e9f4f7d

SHA1
2293f30a6f4c9538bc5b06606c10a50ab4ecef8e

SHA256
e834e1da338b9644d538cefd70176768816da2556939c1255d386931bd085105

SHA512
2a3e466cb5a81d2b65256053b768a98321eb3e65ff46353eefc9864f14a391748116f050e7482ddd73a51575bf0a6fc5c673023dade62dbd8b174442bae1cc6b

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

Filesize
944B

MD5
2ea91e7d1b473f8290ae52d13e105194

SHA1
5e565d99a7733250427e70f5f6e1951a081deed6

SHA256
712db2b991a3c11ccd71b36cfe99fad0b5b1eb1026b12d28c35a43334128671a

SHA512
0d6e2f0f8963986cb27a5cb853c5a87af5d2b65142ff082b4a12681b467d4a72efbcaea71307513523915aa4f27e7b238c67f4ab563f69525938f38253599424

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_d5lkbfap.asi.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1004-3-0x0000023B37D30000-0x0000023B37D52000-memory.dmp

Filesize
136KB

Download
memory/1004-14-0x00007FFD3D6F0000-0x00007FFD3E1B1000-memory.dmp

Filesize
10.8MB

Download
memory/1004-15-0x00007FFD3D6F0000-0x00007FFD3E1B1000-memory.dmp

Filesize
10.8MB

Download
memory/1004-18-0x00007FFD3D6F0000-0x00007FFD3E1B1000-memory.dmp

Filesize
10.8MB

Download
memory/1004-4-0x00007FFD3D6F0000-0x00007FFD3E1B1000-memory.dmp

Filesize
10.8MB

Download
memory/4888-0-0x00007FFD3D6F3000-0x00007FFD3D6F5000-memory.dmp

Filesize
8KB

Download
memory/4888-2-0x00007FFD3D6F0000-0x00007FFD3E1B1000-memory.dmp

Filesize
10.8MB

Download
memory/4888-1-0x0000000000C40000-0x0000000000C5A000-memory.dmp

Filesize
104KB

Download
memory/4888-57-0x00007FFD3D6F0000-0x00007FFD3E1B1000-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