xworm | bfa7bcaceb080d8bbd08c0b92bd595800f59ebe2fc161af543ae66920be40a01

Analysis

max time kernel
101s
max time network
145s
platform
windows11-21h2_x64
resource
win11-20250619-en
resource tags

arch:x64arch:x86image:win11-20250619-enlocale:en-usos:windows11-21h2-x64system
submitted
30/09/2025, 17:01

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General

Target
z28Contrato.exe
Size 524KB
Sample250930-vjtqhatpy3
SHA256 bfa7bcaceb080d8bbd08c0b92bd595800f59ebe2fc161af543ae66920be40a01
MD5 be9e92ddbf6792c9cb63b23453daa5c9
SHA1 7f3d3680ee4a54c6101f9b004aa3ea64bd2db4c0
SHA512 c30ee082bf4c25267bde10cf8366313bf07918d9f4431ecf6296bb16a1811fae5bcf9762b8e84971d33a51600b8ab5de31366cf724ff9d0471b7185d0108e054
SSDEEP 12288:PLCcFVCjcIkqsfaU7vvoGLpK4+GYj9M2UZ:VVnlvvoe44+GyD
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

discovery execution xworm rat trojan

Malware Config

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral2/memory/5704-9-0x0000000000400000-0x000000000041E000-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
3840	powershell.exe
3652	powershell.exe
3988	powershell.exe
1728	powershell.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\bin.lnk	z28Contrato.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\bin.lnk	z28Contrato.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3188 set thread context of 5704	3188	z28Contrato.exe	78

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 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	z28Contrato.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	z28Contrato.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
1728	powershell.exe
1728	powershell.exe
3840	powershell.exe
3840	powershell.exe
3652	powershell.exe
3652	powershell.exe
3988	powershell.exe
3988	powershell.exe
5704	z28Contrato.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	5704	z28Contrato.exe
Token: SeDebugPrivilege	1728	powershell.exe
Token: SeDebugPrivilege	3840	powershell.exe
Token: SeDebugPrivilege	3652	powershell.exe
Token: SeDebugPrivilege	3988	powershell.exe
Token: SeDebugPrivilege	5704	z28Contrato.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5704	z28Contrato.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 3188 wrote to memory of 5704	3188	z28Contrato.exe	78
PID 3188 wrote to memory of 5704	3188	z28Contrato.exe	78
PID 3188 wrote to memory of 5704	3188	z28Contrato.exe	78
PID 3188 wrote to memory of 5704	3188	z28Contrato.exe	78
PID 3188 wrote to memory of 5704	3188	z28Contrato.exe	78
PID 3188 wrote to memory of 5704	3188	z28Contrato.exe	78
PID 3188 wrote to memory of 5704	3188	z28Contrato.exe	78
PID 3188 wrote to memory of 5704	3188	z28Contrato.exe	78
PID 5704 wrote to memory of 1728	5704	z28Contrato.exe	79
PID 5704 wrote to memory of 1728	5704	z28Contrato.exe	79
PID 5704 wrote to memory of 1728	5704	z28Contrato.exe	79
PID 5704 wrote to memory of 3840	5704	z28Contrato.exe	81
PID 5704 wrote to memory of 3840	5704	z28Contrato.exe	81
PID 5704 wrote to memory of 3840	5704	z28Contrato.exe	81
PID 5704 wrote to memory of 3652	5704	z28Contrato.exe	83
PID 5704 wrote to memory of 3652	5704	z28Contrato.exe	83
PID 5704 wrote to memory of 3652	5704	z28Contrato.exe	83
PID 5704 wrote to memory of 3988	5704	z28Contrato.exe	85
PID 5704 wrote to memory of 3988	5704	z28Contrato.exe	85
PID 5704 wrote to memory of 3988	5704	z28Contrato.exe	85

C:\Users\Admin\AppData\Local\Temp\z28Contrato.exe
"C:\Users\Admin\AppData\Local\Temp\z28Contrato.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3188
- C:\Users\Admin\AppData\Local\Temp\z28Contrato.exe
  "C:\Users\Admin\AppData\Local\Temp\z28Contrato.exe"
  2⤵
  - Drops startup file
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:5704
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\z28Contrato.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1728
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'z28Contrato.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3840
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Roaming\bin.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3652
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'bin.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3988

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

powershell.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log
Size 2KB
SHA256 9600b3fdf0565ccb49e21656aa4b24d7c18f776bfd04d9ee984b134707550f02
MD5 d0c46cad6c0778401e21910bd6b56b70
SHA1 7be418951ea96326aca445b8dfe449b2bfa0dca6
SHA512 057531b468f7fbbb2175a696a8aab274dec0d17d9f71df309edcff35e064f3378050066a3df47ccd03048fac461594ec75e3d4fe64f9dd79949d129f51e02949
MD5 SHA1 SHA512

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z28Contrato.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\z28Contrato.exe.log
Size 1KB
SHA256 4c17576f64dea465c45a50573ee41771f7be9962ab2d07f961af4df5589bdcce
MD5 7e1ed0055c3eaa0bbc4a29ec1ef15a6a
SHA1 765b954c1adbb6a6ecc4fe912fdaa6d0fba0ae7d
SHA512 de7c784c37d18c43820908add88f08ab4864c0ef3f9d158cc2c9d1bab120613cb093dd4bfc5d7ed0c289414956cfe0b213c386f8e6b5753847dec915566297c8
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 18KB
SHA256 253f0cdadae52643796e08db787c13d3a16ed1df5e30ba9868f4aae5e0bc32c6
MD5 a71de95e8a1dadc45e0d14535eedbbbb
SHA1 b57846e332af6a56f3dc0b97125ddc24ab2ba020
SHA512 fa60394b792ea33a6ce522bda2c8709e2d21251dba651f9f06cb47081b0a80f56fc7ace7e3672c428e1f26d4350a7d749f14813f72ae8e9cfbcceede77125f14
SSDEEP 384:rL3HhiSGYT9sVLJZu4METDNvjsaRzb8DHZO9xD6+AnYE8apDU1C:fgSLxsQEThvjxGHZws+32UM
MD5 SHA1 SHA512 SSDEEP

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 18KB
SHA256 63658f3d738bf9f0fcbcf3d73742f8d691262738e467af1020396a11ff396f5a
MD5 e64fa3de1847c4a35d89cad6e38002b8
SHA1 d0cc2a25a9222713b070caa3a5f32c15789e5aa2
SHA512 6ae5c396c563684c963bc13892a2839bfa19d52229a1d3cbbb4da7a41cf71f07971365955faeef9ed37bf0094416486b44f332e3b5eb89df872ff10a096b9cc0
SSDEEP 384:XL3HhDSS1asN6FRHE5iA7qNKnNvjs2gtg2NJhI59B9E8u0iFBX:7tSS16RQhqNAvj7gtg+JhaB9E8u0U
MD5 SHA1 SHA512 SSDEEP

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 18KB
SHA256 c7d34e0003f0bf87f1a7c544a9bac660ef440262970f1b01be780f324195726b
MD5 6b18b291ff184fb3e94772fa9e46e031
SHA1 64208be2922518f8d8dfdd7dd0f84cb0fbc3eb94
SHA512 607d9b90a83f1ad6e6f5d1cfe308ccf8e3c5042dc66ce9672682b610faca424fdcfcac9f5877a4a6da8ee9ea534dfa9ed5d77016e3449037f86dbf405d8183fd
SSDEEP 384:mL3Hhf6G2/nLFRHEME9jLmQRpQ72YaRzb09hlO9xgARQ+AnYEkapDU1C:Qp6FnpRPERmQA2tChlwjQ+3WUM
MD5 SHA1 SHA512 SSDEEP

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__PSScriptPolicyTest_0aid4xos.ybp.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_0aid4xos.ybp.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

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memory/1728-49-0x00000000073A0000-0x00000000073BA000-memory.dmp

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memory/1728-41-0x0000000006F00000-0x0000000006FA4000-memory.dmp

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memory/1728-50-0x0000000007380000-0x0000000007388000-memory.dmp

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memory/1728-48-0x0000000007290000-0x00000000072A5000-memory.dmp

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memory/1728-47-0x0000000007280000-0x000000000728E000-memory.dmp

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memory/1728-46-0x0000000007250000-0x0000000007261000-memory.dmp

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memory/1728-13-0x00000000049A0000-0x00000000049B0000-memory.dmp

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memory/1728-14-0x0000000004830000-0x0000000004866000-memory.dmp

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memory/1728-15-0x00000000049A0000-0x00000000049B0000-memory.dmp

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memory/1728-16-0x0000000004FE0000-0x000000000560A000-memory.dmp

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memory/1728-17-0x0000000004D30000-0x0000000004D52000-memory.dmp

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memory/1728-18-0x0000000005620000-0x0000000005686000-memory.dmp

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memory/1728-45-0x00000000072E0000-0x0000000007376000-memory.dmp

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memory/1728-27-0x0000000005800000-0x0000000005B57000-memory.dmp

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memory/1728-28-0x0000000005D00000-0x0000000005D1E000-memory.dmp

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memory/1728-29-0x0000000005D80000-0x0000000005DCC000-memory.dmp

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memory/1728-30-0x0000000006CC0000-0x0000000006CF4000-memory.dmp

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memory/1728-31-0x0000000070240000-0x000000007028C000-memory.dmp

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memory/1728-40-0x00000000062B0000-0x00000000062CE000-memory.dmp

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memory/1728-44-0x00000000070B0000-0x00000000070BA000-memory.dmp

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memory/1728-42-0x0000000007680000-0x0000000007CFA000-memory.dmp

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memory/1728-43-0x0000000007040000-0x000000000705A000-memory.dmp

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memory/3188-2-0x00000000053F0000-0x0000000005482000-memory.dmp

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memory/3188-5-0x0000000005830000-0x0000000005848000-memory.dmp

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memory/3188-1-0x0000000005AD0000-0x0000000006076000-memory.dmp

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memory/3188-6-0x00000000056E0000-0x00000000056F0000-memory.dmp

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memory/3188-0-0x00000000008C0000-0x000000000094A000-memory.dmp

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memory/3188-8-0x00000000091B0000-0x000000000924C000-memory.dmp

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memory/3188-4-0x0000000005490000-0x000000000549A000-memory.dmp

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memory/3188-7-0x0000000006AF0000-0x0000000006B52000-memory.dmp

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memory/3188-3-0x00000000056E0000-0x00000000056F0000-memory.dmp

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memory/3652-83-0x0000000070240000-0x000000007028C000-memory.dmp

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memory/3840-62-0x0000000006240000-0x0000000006597000-memory.dmp

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memory/3840-64-0x0000000070240000-0x000000007028C000-memory.dmp

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memory/3988-101-0x0000000006380000-0x00000000066D7000-memory.dmp

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memory/3988-103-0x0000000070240000-0x000000007028C000-memory.dmp

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memory/5704-9-0x0000000000400000-0x000000000041E000-memory.dmp

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memory/5704-12-0x0000000004F60000-0x0000000004FC6000-memory.dmp

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memory/5704-117-0x0000000005120000-0x0000000005130000-memory.dmp

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memory/5704-118-0x0000000005120000-0x0000000005130000-memory.dmp

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