xworm | 4e986640769f16346bc1b6d9f5d033f4452c659b1275fc70bc736f1b2079828a

Analysis

max time kernel
59s
max time network
58s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
06-11-2024 20:28

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General

Target

nurik.exe
Size

68KB
MD5

0815ae69147a697b5bae3d8d15cb7c75
SHA1

99a3b145ca36742aa0cbe0ef33829426f1dcf4ef
SHA256

4e986640769f16346bc1b6d9f5d033f4452c659b1275fc70bc736f1b2079828a
SHA512

992b165f6816f4711b3b0a6b7a8f83e4f58838abea7714df4bc8c30f7d9ed401d9b8f63296e3d13ca2d81894f754511628b042c5028feca4f54ca2b6bf70f0aa
SSDEEP

1536:RR1SVHku2BbeHCKNNJu+b4+QA6e2OcJv5SuUA:oReSTNu+b4e2Oa7R

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

pst-evidence.gl.at.ply.gg:8848

Attributes

Install_directory
%LocalAppData%
install_file
System32.exe

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral1/memory/4456-1-0x00000000000B0000-0x00000000000C8000-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
3988	powershell.exe
3368	powershell.exe
896	powershell.exe
1716	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-1-5-21-4074627901-37362009-3519777259-1000\Control Panel\International\Geo\Nation	nurik.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\System32.lnk	nurik.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\System32.lnk	nurik.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-1-5-21-4074627901-37362009-3519777259-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\System32 = "C:\\Users\\Admin\\AppData\\Local\\System32.exe"	nurik.exe

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

System Information Discovery
T1082

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
3568	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
3988	powershell.exe
3988	powershell.exe
3368	powershell.exe
3368	powershell.exe
896	powershell.exe
896	powershell.exe
1716	powershell.exe
1716	powershell.exe
4456	nurik.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	4456	nurik.exe
Token: SeDebugPrivilege	3988	powershell.exe
Token: SeIncreaseQuotaPrivilege	3988	powershell.exe
Token: SeSecurityPrivilege	3988	powershell.exe
Token: SeTakeOwnershipPrivilege	3988	powershell.exe
Token: SeLoadDriverPrivilege	3988	powershell.exe
Token: SeSystemProfilePrivilege	3988	powershell.exe
Token: SeSystemtimePrivilege	3988	powershell.exe
Token: SeProfSingleProcessPrivilege	3988	powershell.exe
Token: SeIncBasePriorityPrivilege	3988	powershell.exe
Token: SeCreatePagefilePrivilege	3988	powershell.exe
Token: SeBackupPrivilege	3988	powershell.exe
Token: SeRestorePrivilege	3988	powershell.exe
Token: SeShutdownPrivilege	3988	powershell.exe
Token: SeDebugPrivilege	3988	powershell.exe
Token: SeSystemEnvironmentPrivilege	3988	powershell.exe
Token: SeRemoteShutdownPrivilege	3988	powershell.exe
Token: SeUndockPrivilege	3988	powershell.exe
Token: SeManageVolumePrivilege	3988	powershell.exe
Token: 33	3988	powershell.exe
Token: 34	3988	powershell.exe
Token: 35	3988	powershell.exe
Token: 36	3988	powershell.exe
Token: SeDebugPrivilege	3368	powershell.exe
Token: SeIncreaseQuotaPrivilege	3368	powershell.exe
Token: SeSecurityPrivilege	3368	powershell.exe
Token: SeTakeOwnershipPrivilege	3368	powershell.exe
Token: SeLoadDriverPrivilege	3368	powershell.exe
Token: SeSystemProfilePrivilege	3368	powershell.exe
Token: SeSystemtimePrivilege	3368	powershell.exe
Token: SeProfSingleProcessPrivilege	3368	powershell.exe
Token: SeIncBasePriorityPrivilege	3368	powershell.exe
Token: SeCreatePagefilePrivilege	3368	powershell.exe
Token: SeBackupPrivilege	3368	powershell.exe
Token: SeRestorePrivilege	3368	powershell.exe
Token: SeShutdownPrivilege	3368	powershell.exe
Token: SeDebugPrivilege	3368	powershell.exe
Token: SeSystemEnvironmentPrivilege	3368	powershell.exe
Token: SeRemoteShutdownPrivilege	3368	powershell.exe
Token: SeUndockPrivilege	3368	powershell.exe
Token: SeManageVolumePrivilege	3368	powershell.exe
Token: 33	3368	powershell.exe
Token: 34	3368	powershell.exe
Token: 35	3368	powershell.exe
Token: 36	3368	powershell.exe
Token: SeDebugPrivilege	896	powershell.exe
Token: SeIncreaseQuotaPrivilege	896	powershell.exe
Token: SeSecurityPrivilege	896	powershell.exe
Token: SeTakeOwnershipPrivilege	896	powershell.exe
Token: SeLoadDriverPrivilege	896	powershell.exe
Token: SeSystemProfilePrivilege	896	powershell.exe
Token: SeSystemtimePrivilege	896	powershell.exe
Token: SeProfSingleProcessPrivilege	896	powershell.exe
Token: SeIncBasePriorityPrivilege	896	powershell.exe
Token: SeCreatePagefilePrivilege	896	powershell.exe
Token: SeBackupPrivilege	896	powershell.exe
Token: SeRestorePrivilege	896	powershell.exe
Token: SeShutdownPrivilege	896	powershell.exe
Token: SeDebugPrivilege	896	powershell.exe
Token: SeSystemEnvironmentPrivilege	896	powershell.exe
Token: SeRemoteShutdownPrivilege	896	powershell.exe
Token: SeUndockPrivilege	896	powershell.exe
Token: SeManageVolumePrivilege	896	powershell.exe
Token: 33	896	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4456	nurik.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4456 wrote to memory of 3988	4456	nurik.exe	86
PID 4456 wrote to memory of 3988	4456	nurik.exe	86
PID 4456 wrote to memory of 3368	4456	nurik.exe	90
PID 4456 wrote to memory of 3368	4456	nurik.exe	90
PID 4456 wrote to memory of 896	4456	nurik.exe	92
PID 4456 wrote to memory of 896	4456	nurik.exe	92
PID 4456 wrote to memory of 1716	4456	nurik.exe	94
PID 4456 wrote to memory of 1716	4456	nurik.exe	94
PID 4456 wrote to memory of 3568	4456	nurik.exe	96
PID 4456 wrote to memory of 3568	4456	nurik.exe	96

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\nurik.exe
"C:\Users\Admin\AppData\Local\Temp\nurik.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:4456
- 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\nurik.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3988
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'nurik.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3368
- 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\System32.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:896
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'System32.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  PID:1716
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "System32" /tr "C:\Users\Admin\AppData\Local\System32.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3568

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

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
3KB

MD5
3eb3833f769dd890afc295b977eab4b4

SHA1
e857649b037939602c72ad003e5d3698695f436f

SHA256
c485a6e2fd17c342fca60060f47d6a5655a65a412e35e001bb5bf88d96e6e485

SHA512
c24bbc8f278478d43756807b8c584d4e3fb2289db468bc92986a489f74a8da386a667a758360a397e77e018e363be8912ac260072fa3e31117ad0599ac749e72

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

Filesize
1KB

MD5
c67441dfa09f61bca500bb43407c56b8

SHA1
5a56cf7cbeb48c109e2128c31b681fac3959157b

SHA256
63082da456c124d0bc516d2161d1613db5f3008d903e4066d2c7b4e90b435f33

SHA512
325de8b718b3a01df05e20e028c5882240e5fd2e96c771361b776312923ff178f27494a1f5249bf6d7365a99155eb8735a51366e85597008e6a10462e63ee0e8

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

Filesize
1KB

MD5
da23be176b613bc37be7492de00ebfc3

SHA1
959bfe7012670f2675b1157b5b80f384570b91a4

SHA256
bbb0a39093848a759d6a86708d64fbc000466dff8b7c71ee17bdb375143dd4c0

SHA512
d90676354af562b35e1d1839eab849bf1368f624ee765091e4b8e5b4606709503ce77669c564c9b122ac202a6f6d6342efcc9d713cafcdb20c75f7d25276f135

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

Filesize
1KB

MD5
432d0ad71f512917e53b990faa8bfe65

SHA1
936def001949aa2ee00487a68605a5eedb19d01b

SHA256
55b66f6e9bc2d04622ad68244d9101a29a8e999f2201a3e95fafb43f86b5b39e

SHA512
1d01ffd44c0f7344ed280be27425be0e6ac49665b36afb18fa15189304b21c2cdf6aa2d7a7a1e34c602d7e87d2caa845983c5eef3261161778568d7739edd714

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_vhpnpq1n.eqx.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/3988-12-0x00007FF9238E0000-0x00007FF9243A2000-memory.dmp

Filesize
10.8MB

Download
memory/3988-14-0x00007FF9238E0000-0x00007FF9243A2000-memory.dmp

Filesize
10.8MB

Download
memory/3988-15-0x00007FF9238E0000-0x00007FF9243A2000-memory.dmp

Filesize
10.8MB

Download
memory/3988-18-0x00007FF9238E0000-0x00007FF9243A2000-memory.dmp

Filesize
10.8MB

Download
memory/3988-19-0x00007FF9238E0000-0x00007FF9243A2000-memory.dmp

Filesize
10.8MB

Download
memory/3988-13-0x00007FF9238E0000-0x00007FF9243A2000-memory.dmp

Filesize
10.8MB

Download
memory/3988-11-0x000001F3B66F0000-0x000001F3B6712000-memory.dmp

Filesize
136KB

Download
memory/4456-0-0x00007FF9238E3000-0x00007FF9238E5000-memory.dmp

Filesize
8KB

Download
memory/4456-1-0x00000000000B0000-0x00000000000C8000-memory.dmp

Filesize
96KB

Download
memory/4456-54-0x00007FF9238E3000-0x00007FF9238E5000-memory.dmp

Filesize
8KB

Download
memory/4456-59-0x00007FF9238E0000-0x00007FF9243A2000-memory.dmp

Filesize
10.8MB

Download
memory/4456-60-0x00007FF9238E0000-0x00007FF9243A2000-memory.dmp

Filesize
10.8MB

Download