shurk | 266ec9b6c8f07ba35e7f7c1223583a6b78770f2647b8fdd1af7b1a5af18d4f9d

Analysis

max time kernel
150s
max time network
139s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
08-09-2024 13:03

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

NOSU.exe
Size

86KB
MD5

d5aebbb30b6b622ab2f6c0f9956395f2
SHA1

b89cd9e3a2d5baa995c1bffbf183ba3fe48e47a1
SHA256

266ec9b6c8f07ba35e7f7c1223583a6b78770f2647b8fdd1af7b1a5af18d4f9d
SHA512

a1579b6f40c539d233368fd41b1af1226c63c596d19492f7adb0ac26319bac82e4adb8b0fc30c2dd20562a253d195311ab600d25b095a321deaa7fe25b9140ef
SSDEEP

384:G0CpAU8pTNkdSSGC1TdwGNaXbb/UaHgGkE00PIYTNxg9DTUiJFnh:G04AbQaGNY0BY/g98izh

Score

10^/10

shurk discovery evasion execution infostealer trojan

Malware Config

Signatures

Modifies Windows Defender Real-time Protection settings 3 TTPs 4 IoCs

evasion trojan

Modify Registry

T1112

Windows Service

T1543.003

Disable or Modify Tools

T1562.001

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	NOSU.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	NOSU.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	NOSU.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection	NOSU.exe

Shurk
Shurk is an infostealer, written in C++ which appeared in 2021.
infostealer shurk

Command and Scripting Interpreter: PowerShell 1 TTPs 9 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
2980	powershell.exe
5040	powershell.exe
3652	powershell.exe
5040	powershell.exe
4904	powershell.exe
3652	powershell.exe
4528	powershell.exe
2980	powershell.exe
344	powershell.exe

Disables RegEdit via registry modification 1 IoCs

evasion

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-2392887640-1187051047-2909758433-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	NOSU.exe

Disables Task Manager via registry modification
evasion

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-1-5-21-2392887640-1187051047-2909758433-1000\Control Panel\International\Geo\Nation	NOSU.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\COPYING.LGPLv2.1.cm	NOSU.exe
File created	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\LICENSE.cm	NOSU.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\Control	NOSU.exe

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 8 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	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	NOSU.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 12 IoCs

pid	Process
5040	powershell.exe
5040	powershell.exe
4904	powershell.exe
4904	powershell.exe
3652	powershell.exe
3652	powershell.exe
4528	powershell.exe
4528	powershell.exe
2980	powershell.exe
2980	powershell.exe
344	powershell.exe
344	powershell.exe

Suspicious behavior: RenamesItself 2 IoCs

pid	Process
2728	NOSU.exe
2728	NOSU.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	2728	NOSU.exe
Token: SeDebugPrivilege	5040	powershell.exe
Token: SeDebugPrivilege	4904	powershell.exe
Token: SeDebugPrivilege	3652	powershell.exe
Token: SeDebugPrivilege	4528	powershell.exe
Token: SeDebugPrivilege	2980	powershell.exe
Token: SeDebugPrivilege	344	powershell.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 2728 wrote to memory of 5040	2728	NOSU.exe	88
PID 2728 wrote to memory of 5040	2728	NOSU.exe	88
PID 2728 wrote to memory of 5040	2728	NOSU.exe	88
PID 5040 wrote to memory of 4904	5040	powershell.exe	91
PID 5040 wrote to memory of 4904	5040	powershell.exe	91
PID 5040 wrote to memory of 4904	5040	powershell.exe	91
PID 2728 wrote to memory of 3652	2728	NOSU.exe	92
PID 2728 wrote to memory of 3652	2728	NOSU.exe	92
PID 2728 wrote to memory of 3652	2728	NOSU.exe	92
PID 3652 wrote to memory of 4528	3652	powershell.exe	96
PID 3652 wrote to memory of 4528	3652	powershell.exe	96
PID 3652 wrote to memory of 4528	3652	powershell.exe	96
PID 2728 wrote to memory of 2980	2728	NOSU.exe	99
PID 2728 wrote to memory of 2980	2728	NOSU.exe	99
PID 2728 wrote to memory of 2980	2728	NOSU.exe	99
PID 2980 wrote to memory of 344	2980	powershell.exe	101
PID 2980 wrote to memory of 344	2980	powershell.exe	101
PID 2980 wrote to memory of 344	2980	powershell.exe	101
PID 2728 wrote to memory of 2988	2728	NOSU.exe	103
PID 2728 wrote to memory of 2988	2728	NOSU.exe	103
PID 2728 wrote to memory of 2988	2728	NOSU.exe	103

C:\Users\Admin\AppData\Local\Temp\NOSU.exe
"C:\Users\Admin\AppData\Local\Temp\NOSU.exe"
1⤵
- Modifies Windows Defender Real-time Protection settings
- Disables RegEdit via registry modification
- Checks computer location settings
- Drops file in Program Files directory
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: RenamesItself
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2728
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" -NoProfile -ExecutionPolicy Bypass -WindowStyle Hidden -Command powershell -Command Add-MpPreference -ExclusionPath 'C:\Windows\'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:5040
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -Command Add-MpPreference -ExclusionPath C:\Windows\
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4904
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" -NoProfile -ExecutionPolicy Bypass -WindowStyle Hidden -Command powershell -Command Add-MpPreference -ExclusionPath 'C:\Windows\Control'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3652
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -Command Add-MpPreference -ExclusionPath C:\Windows\Control
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4528
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" -NoProfile -ExecutionPolicy Bypass -WindowStyle Hidden -Command powershell -Command Add-MpPreference -ExclusionPath 'C:\'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2980
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -Command Add-MpPreference -ExclusionPath C:\
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:344
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "color 4 && echo Unfortunately, your system has been infected with NOSU virus. && echo This type of virus is classified as critical and we do not have the means to remove it at this time. && echo God help you. && pause"
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2988

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Create or Modify System Process

T1543

Windows Service

T1543.003

Privilege Escalation

Create or Modify System Process

T1543

Windows Service

T1543.003

Defense Evasion

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
968cb9309758126772781b83adb8a28f

SHA1
8da30e71accf186b2ba11da1797cf67f8f78b47c

SHA256
92099c10776bb7e3f2a8d1b82d4d40d0c4627e4f1bf754a6e58dfd2c2e97042a

SHA512
4bd50732f8af4d688d95999bddfd296115d7033ddc38f86c9fb1f47fde202bffa27e9088bebcaa3064ca946af2f5c1ca6cbde49d0907f0005c7ab42874515dd3

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

Filesize
11KB

MD5
a252b0adde44afb81eb63d3ef6daa888

SHA1
a42fa5ffbcf9a6631595246fd98b2a87edd3e4a8

SHA256
d69eca0ef624868706f8bcf8282b98ca58a36dd98f30c95d7982390dad2827c3

SHA512
6d443c3ae0b00aad24d2c736143d76395dbfcc54980ab0b72cbe8bdbe258e449cc91a2f6e3ec7430d25220f58476482b48149ee1d77212e61e61685e908bb087

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

Filesize
11KB

MD5
9ba29a1fa879699897ac306c7ceaa029

SHA1
86dae653ce6c15baadd8fa88d5ec0884a92dba8d

SHA256
9b882c298f05a4c01547ca6a7e9b05b4149238773a6d84839d7c46ef286b50fc

SHA512
98b30ab8d018686704a7d836f995e2d9a5bb007f437c162ec162573c42bb9b94727af18c16baf0eb454a789a948d787eda25ce7012042187df411aff74490046

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

Filesize
11KB

MD5
1d15b73a0ffb17fc0c0c13919d56ca58

SHA1
6577f6a32ebbd09698fad2185e81f649a05168d4

SHA256
12a84d17e1ef4bffaa8130d197590bc406ca691a89ba65595bbf9ea6a90137c6

SHA512
6baf9070dcccf5915bb7946aeea23c04ee229003c61058c7ed38ed1da4d433315e6d8cc09b1d64fa5a3c63dc986daee15116b51987720946dcdc9dcd36848b06

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_q3cqcrca.f1r.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/344-120-0x0000000070830000-0x000000007087C000-memory.dmp

Filesize
304KB

Download
memory/2728-135-0x0000000005C20000-0x0000000005CB2000-memory.dmp

Filesize
584KB

Download
memory/2728-133-0x00000000059E0000-0x0000000005A7C000-memory.dmp

Filesize
624KB

Download
memory/2728-134-0x0000000006030000-0x00000000065D4000-memory.dmp

Filesize
5.6MB

Download
memory/2728-136-0x0000000006710000-0x000000000671A000-memory.dmp

Filesize
40KB

Download
memory/2728-0-0x0000000074ABE000-0x0000000074ABF000-memory.dmp

Filesize
4KB

Download
memory/2728-78-0x0000000074AB0000-0x0000000075260000-memory.dmp

Filesize
7.7MB

Download
memory/2728-77-0x0000000074ABE000-0x0000000074ABF000-memory.dmp

Filesize
4KB

Download
memory/2728-2-0x0000000074AB0000-0x0000000075260000-memory.dmp

Filesize
7.7MB

Download
memory/2728-1-0x0000000000BC0000-0x0000000000BDA000-memory.dmp

Filesize
104KB

Download
memory/3652-75-0x0000000005D40000-0x0000000006094000-memory.dmp

Filesize
3.3MB

Download
memory/4528-88-0x0000000070830000-0x000000007087C000-memory.dmp

Filesize
304KB

Download
memory/4904-34-0x00000000076F0000-0x0000000007722000-memory.dmp

Filesize
200KB

Download
memory/4904-52-0x0000000007900000-0x000000000790A000-memory.dmp

Filesize
40KB

Download
memory/4904-45-0x0000000007730000-0x000000000774E000-memory.dmp

Filesize
120KB

Download
memory/4904-46-0x0000000074AB0000-0x0000000075260000-memory.dmp

Filesize
7.7MB

Download
memory/4904-47-0x0000000007750000-0x00000000077F3000-memory.dmp

Filesize
652KB

Download
memory/4904-48-0x0000000074AB0000-0x0000000075260000-memory.dmp

Filesize
7.7MB

Download
memory/4904-49-0x0000000074AB0000-0x0000000075260000-memory.dmp

Filesize
7.7MB

Download
memory/4904-50-0x0000000007ED0000-0x000000000854A000-memory.dmp

Filesize
6.5MB

Download
memory/4904-51-0x0000000007890000-0x00000000078AA000-memory.dmp

Filesize
104KB

Download
memory/4904-35-0x0000000070830000-0x000000007087C000-memory.dmp

Filesize
304KB

Download
memory/4904-53-0x0000000007B10000-0x0000000007BA6000-memory.dmp

Filesize
600KB

Download
memory/4904-54-0x0000000007A90000-0x0000000007AA1000-memory.dmp

Filesize
68KB

Download
memory/4904-55-0x0000000007AC0000-0x0000000007ACE000-memory.dmp

Filesize
56KB

Download
memory/4904-56-0x0000000007AD0000-0x0000000007AE4000-memory.dmp

Filesize
80KB

Download
memory/4904-57-0x0000000007BD0000-0x0000000007BEA000-memory.dmp

Filesize
104KB

Download
memory/4904-58-0x0000000007BB0000-0x0000000007BB8000-memory.dmp

Filesize
32KB

Download
memory/4904-61-0x0000000074AB0000-0x0000000075260000-memory.dmp

Filesize
7.7MB

Download
memory/4904-33-0x0000000074AB0000-0x0000000075260000-memory.dmp

Filesize
7.7MB

Download
memory/4904-23-0x0000000074AB0000-0x0000000075260000-memory.dmp

Filesize
7.7MB

Download
memory/5040-20-0x0000000074AB0000-0x0000000075260000-memory.dmp

Filesize
7.7MB

Download
memory/5040-65-0x0000000074AB0000-0x0000000075260000-memory.dmp

Filesize
7.7MB

Download
memory/5040-22-0x0000000006330000-0x000000000637C000-memory.dmp

Filesize
304KB

Download
memory/5040-21-0x0000000006300000-0x000000000631E000-memory.dmp

Filesize
120KB

Download
memory/5040-18-0x0000000074AB0000-0x0000000075260000-memory.dmp

Filesize
7.7MB

Download
memory/5040-19-0x0000000005CE0000-0x0000000006034000-memory.dmp

Filesize
3.3MB

Download
memory/5040-8-0x0000000005BF0000-0x0000000005C56000-memory.dmp

Filesize
408KB

Download
memory/5040-7-0x0000000005B10000-0x0000000005B76000-memory.dmp

Filesize
408KB

Download
memory/5040-6-0x0000000005430000-0x0000000005452000-memory.dmp

Filesize
136KB

Download
memory/5040-5-0x0000000074AB0000-0x0000000075260000-memory.dmp

Filesize
7.7MB

Download
memory/5040-4-0x0000000005470000-0x0000000005A98000-memory.dmp

Filesize
6.2MB

Download
memory/5040-3-0x0000000004D80000-0x0000000004DB6000-memory.dmp

Filesize
216KB

Download