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 2 IoCs

resource	yara_rule
behavioral2/memory/4540-1-0x0000000000F50000-0x0000000000F68000-memory.dmp	family_xworm
behavioral2/files/0x0012000000023ae5-58.dat	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
1444	powershell.exe
3068	powershell.exe
1716	powershell.exe
1456	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-1-5-21-1045960512-3948844814-3059691613-1000\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

Executes dropped EXE 3 IoCs

pid	Process
1896	System32.exe
2812	System32.exe
2548	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-1-5-21-1045960512-3948844814-3059691613-1000\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
4228	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
1456	powershell.exe
1456	powershell.exe
1444	powershell.exe
1444	powershell.exe
3068	powershell.exe
3068	powershell.exe
1716	powershell.exe
1716	powershell.exe
4540	nurik.exe

Suspicious use of AdjustPrivilegeToken 9 IoCs

description	pid	Process
Token: SeDebugPrivilege	4540	nurik.exe
Token: SeDebugPrivilege	1456	powershell.exe
Token: SeDebugPrivilege	1444	powershell.exe
Token: SeDebugPrivilege	3068	powershell.exe
Token: SeDebugPrivilege	1716	powershell.exe
Token: SeDebugPrivilege	4540	nurik.exe
Token: SeDebugPrivilege	1896	System32.exe
Token: SeDebugPrivilege	2812	System32.exe
Token: SeDebugPrivilege	2548	System32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4540	nurik.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4540 wrote to memory of 1456	4540	nurik.exe	89
PID 4540 wrote to memory of 1456	4540	nurik.exe	89
PID 4540 wrote to memory of 1444	4540	nurik.exe	93
PID 4540 wrote to memory of 1444	4540	nurik.exe	93
PID 4540 wrote to memory of 3068	4540	nurik.exe	96
PID 4540 wrote to memory of 3068	4540	nurik.exe	96
PID 4540 wrote to memory of 1716	4540	nurik.exe	98
PID 4540 wrote to memory of 1716	4540	nurik.exe	98
PID 4540 wrote to memory of 4228	4540	nurik.exe	100
PID 4540 wrote to memory of 4228	4540	nurik.exe	100

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:4540
- 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:1456
- 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:1444
- 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:3068
- 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: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:4228

C:\Users\Admin\AppData\Local\System32.exe
C:\Users\Admin\AppData\Local\System32.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1896

C:\Users\Admin\AppData\Local\System32.exe
C:\Users\Admin\AppData\Local\System32.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2812

C:\Users\Admin\AppData\Local\System32.exe
C:\Users\Admin\AppData\Local\System32.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2548

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

2

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\System32.exe.log

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

Download Submit
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
cadef9abd087803c630df65264a6c81c

SHA1
babbf3636c347c8727c35f3eef2ee643dbcc4bd2

SHA256
cce65b73cdfe9304bcd5207913e8b60fb69faa20cd3b684f2b0343b755b99438

SHA512
7278aa87124abb382d9024a645e881e7b7cf1b84e8894943b36e018dbf0399e6858392f77980b599fa5488e2e21bf757a0702fe6419417edac93b68e0c2ec085

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

Filesize
944B

MD5
34f595487e6bfd1d11c7de88ee50356a

SHA1
4caad088c15766cc0fa1f42009260e9a02f953bb

SHA256
0f9a4b52e01cb051052228a55d0515911b7ef5a8db3cf925528c746df511424d

SHA512
10976c5deaf9fac449e703e852c3b08d099f430de2d7c7b8e2525c35d63e28b890e5aab63feff9b20bca0aaf9f35a3ba411aee3fbeee9ea59f90ed25bd617a0b

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

Filesize
944B

MD5
10890cda4b6eab618e926c4118ab0647

SHA1
1e1d63b73a0e6c7575f458b3c7917a9ce5ba776d

SHA256
00f8a035324d39bd62e6dee5e1b480069015471c487ebee4479e6990ea9ddb14

SHA512
a2ee84006c24a36f25e0bca0772430d64e3791f233da916aecdeae6712763e77d55bbbd00dc8f6b2b3887f3c26ab3980b96c5f46cc823e81e28abbbc5fc78221

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

Filesize
68KB

MD5
0815ae69147a697b5bae3d8d15cb7c75

SHA1
99a3b145ca36742aa0cbe0ef33829426f1dcf4ef

SHA256
4e986640769f16346bc1b6d9f5d033f4452c659b1275fc70bc736f1b2079828a

SHA512
992b165f6816f4711b3b0a6b7a8f83e4f58838abea7714df4bc8c30f7d9ed401d9b8f63296e3d13ca2d81894f754511628b042c5028feca4f54ca2b6bf70f0aa

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_qcnijg2x.wdl.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1456-2-0x00007FF8F9E90000-0x00007FF8FA085000-memory.dmp

Filesize
2.0MB

Download
memory/1456-17-0x00007FF8F9E90000-0x00007FF8FA085000-memory.dmp

Filesize
2.0MB

Download
memory/1456-14-0x000001ECEA4D0000-0x000001ECEA4F2000-memory.dmp

Filesize
136KB

Download
memory/1456-3-0x00007FF8F9E90000-0x00007FF8FA085000-memory.dmp

Filesize
2.0MB

Download
memory/1456-4-0x00007FF8F9E90000-0x00007FF8FA085000-memory.dmp

Filesize
2.0MB

Download
memory/4540-0-0x00007FF8F9E90000-0x00007FF8FA085000-memory.dmp

Filesize
2.0MB

Download
memory/4540-56-0x00007FF8F9E90000-0x00007FF8FA085000-memory.dmp

Filesize
2.0MB

Download
memory/4540-57-0x00007FF8F9E90000-0x00007FF8FA085000-memory.dmp

Filesize
2.0MB

Download
memory/4540-1-0x0000000000F50000-0x0000000000F68000-memory.dmp

Filesize
96KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads