xworm | 4e986640769f16346bc1b6d9f5d033f4452c659b1275fc70bc736f1b2079828a

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

C2

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

Attributes

Install_directory
%LocalAppData%
install_file
System32.exe

Signatures

Detect Xworm Payload 5 IoCs

resource	yara_rule
behavioral1/memory/2888-1-0x0000000000BC0000-0x0000000000BD8000-memory.dmp	family_xworm
behavioral1/files/0x000f000000012263-34.dat	family_xworm
behavioral1/memory/2396-36-0x00000000002D0000-0x00000000002E8000-memory.dmp	family_xworm
behavioral1/memory/2052-40-0x0000000000980000-0x0000000000998000-memory.dmp	family_xworm
behavioral1/memory/1736-42-0x0000000000FC0000-0x0000000000FD8000-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
2224	powershell.exe
2172	powershell.exe
2788	powershell.exe
1804	powershell.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

Executes dropped EXE 3 IoCs

pid	Process
2396	System32.exe
2052	System32.exe
1736	System32.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-1-5-21-3692679935-4019334568-335155002-1000\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
2168	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2224	powershell.exe
2172	powershell.exe
2788	powershell.exe
1804	powershell.exe
2888	nurik.exe

Suspicious use of AdjustPrivilegeToken 9 IoCs

description	pid	Process
Token: SeDebugPrivilege	2888	nurik.exe
Token: SeDebugPrivilege	2224	powershell.exe
Token: SeDebugPrivilege	2172	powershell.exe
Token: SeDebugPrivilege	2788	powershell.exe
Token: SeDebugPrivilege	1804	powershell.exe
Token: SeDebugPrivilege	2888	nurik.exe
Token: SeDebugPrivilege	2396	System32.exe
Token: SeDebugPrivilege	2052	System32.exe
Token: SeDebugPrivilege	1736	System32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2888	nurik.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 2888 wrote to memory of 2224	2888	nurik.exe	30
PID 2888 wrote to memory of 2224	2888	nurik.exe	30
PID 2888 wrote to memory of 2224	2888	nurik.exe	30
PID 2888 wrote to memory of 2172	2888	nurik.exe	32
PID 2888 wrote to memory of 2172	2888	nurik.exe	32
PID 2888 wrote to memory of 2172	2888	nurik.exe	32
PID 2888 wrote to memory of 2788	2888	nurik.exe	34
PID 2888 wrote to memory of 2788	2888	nurik.exe	34
PID 2888 wrote to memory of 2788	2888	nurik.exe	34
PID 2888 wrote to memory of 1804	2888	nurik.exe	36
PID 2888 wrote to memory of 1804	2888	nurik.exe	36
PID 2888 wrote to memory of 1804	2888	nurik.exe	36
PID 2888 wrote to memory of 2168	2888	nurik.exe	38
PID 2888 wrote to memory of 2168	2888	nurik.exe	38
PID 2888 wrote to memory of 2168	2888	nurik.exe	38
PID 2572 wrote to memory of 2396	2572	taskeng.exe	41
PID 2572 wrote to memory of 2396	2572	taskeng.exe	41
PID 2572 wrote to memory of 2396	2572	taskeng.exe	41
PID 2572 wrote to memory of 2052	2572	taskeng.exe	43
PID 2572 wrote to memory of 2052	2572	taskeng.exe	43
PID 2572 wrote to memory of 2052	2572	taskeng.exe	43
PID 2572 wrote to memory of 1736	2572	taskeng.exe	44
PID 2572 wrote to memory of 1736	2572	taskeng.exe	44
PID 2572 wrote to memory of 1736	2572	taskeng.exe	44

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⤵
- 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:2888
- 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:2224
- 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:2172
- 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:2788
- 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
  - Suspicious use of AdjustPrivilegeToken
  PID:1804
- 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:2168

C:\Windows\system32\taskeng.exe
taskeng.exe {53C2CA30-63CC-4C14-97DB-2CE449D7B9FF} S-1-5-21-3692679935-4019334568-335155002-1000:BCXRJFKE\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2572
- C:\Users\Admin\AppData\Local\System32.exe
  C:\Users\Admin\AppData\Local\System32.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2396
- C:\Users\Admin\AppData\Local\System32.exe
  C:\Users\Admin\AppData\Local\System32.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2052
- C:\Users\Admin\AppData\Local\System32.exe
  C:\Users\Admin\AppData\Local\System32.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1736

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\System32.exe

Filesize
68KB

MD5
0815ae69147a697b5bae3d8d15cb7c75

SHA1
99a3b145ca36742aa0cbe0ef33829426f1dcf4ef

SHA256
4e986640769f16346bc1b6d9f5d033f4452c659b1275fc70bc736f1b2079828a

SHA512
992b165f6816f4711b3b0a6b7a8f83e4f58838abea7714df4bc8c30f7d9ed401d9b8f63296e3d13ca2d81894f754511628b042c5028feca4f54ca2b6bf70f0aa

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
5e996a871a42c3508b9ccb2b1cb81145

SHA1
0f3c2b3bd5df554c1c96c9bfb7440ea3918063b3

SHA256
a4519de55ae914acaeece9aae1af6a228f7e0294217934a0866fcbddd77cad23

SHA512
5b3e938a2fd76085fc95067636c72fb9185fc849c39afd0dc0b7b1ea5411204cfc68d53812cfa6bb3d5f9d5d305f127612018231670e700a41526b2f1a25b49f

Download Submit
memory/1736-42-0x0000000000FC0000-0x0000000000FD8000-memory.dmp

Filesize
96KB

Download
memory/2052-40-0x0000000000980000-0x0000000000998000-memory.dmp

Filesize
96KB

Download
memory/2172-15-0x0000000001F90000-0x0000000001F98000-memory.dmp

Filesize
32KB

Download
memory/2172-14-0x000000001B330000-0x000000001B612000-memory.dmp

Filesize
2.9MB

Download
memory/2224-8-0x0000000001E70000-0x0000000001E78000-memory.dmp

Filesize
32KB

Download
memory/2224-7-0x000000001B380000-0x000000001B662000-memory.dmp

Filesize
2.9MB

Download
memory/2224-6-0x0000000002B20000-0x0000000002BA0000-memory.dmp

Filesize
512KB

Download
memory/2396-36-0x00000000002D0000-0x00000000002E8000-memory.dmp

Filesize
96KB

Download
memory/2888-0-0x000007FEF56D3000-0x000007FEF56D4000-memory.dmp

Filesize
4KB

Download
memory/2888-28-0x000007FEF56D3000-0x000007FEF56D4000-memory.dmp

Filesize
4KB

Download
memory/2888-32-0x000000001B160000-0x000000001B1E0000-memory.dmp

Filesize
512KB

Download
memory/2888-37-0x000000001B160000-0x000000001B1E0000-memory.dmp

Filesize
512KB

Download
memory/2888-1-0x0000000000BC0000-0x0000000000BD8000-memory.dmp

Filesize
96KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads