shurk | 086b1059bd646df913f8ed3a5fd3ee6efd6e63b5ee0d9f1a0d98246993832ab4

Analysis

max time kernel
150s
max time network
150s
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 11:54

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General

Target

NOSU.exe
Size

86KB
MD5

19821b42fb6c365e341d751505af9d2c
SHA1

5537fa3e031abe119faa45cef02cc3573829a508
SHA256

086b1059bd646df913f8ed3a5fd3ee6efd6e63b5ee0d9f1a0d98246993832ab4
SHA512

06d6ca44a662118536fda0a8e9f9d7b96b74c0f37c1fabcf6e516cbfc608348ad0e369c302e94f3929b949aa4f0f37e969ad565ae1cd8eb9eaa90654603ee1b2
SSDEEP

384:ee8HUEVwV7gxlz2/uwG0XbO/UaHgGkE002c8Dqs9DTUiJFnh:e/f8G30g8b98izh

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
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection	NOSU.exe
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

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
4088	powershell.exe
1572	powershell.exe
1492	powershell.exe
1492	powershell.exe
3040	powershell.exe
4088	powershell.exe
668	powershell.exe
1572	powershell.exe
2948	powershell.exe

Disables RegEdit via registry modification 1 IoCs

evasion

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-355097885-2402257403-2971294179-1000\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-1-5-21-355097885-2402257403-2971294179-1000\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	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
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
1492	powershell.exe
1492	powershell.exe
3040	powershell.exe
3040	powershell.exe
4088	powershell.exe
4088	powershell.exe
668	powershell.exe
668	powershell.exe
1572	powershell.exe
1572	powershell.exe
2948	powershell.exe
2948	powershell.exe

Suspicious behavior: RenamesItself 2 IoCs

pid	Process
1960	NOSU.exe
1960	NOSU.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	1960	NOSU.exe
Token: SeDebugPrivilege	1492	powershell.exe
Token: SeDebugPrivilege	3040	powershell.exe
Token: SeDebugPrivilege	4088	powershell.exe
Token: SeDebugPrivilege	668	powershell.exe
Token: SeDebugPrivilege	1572	powershell.exe
Token: SeDebugPrivilege	2948	powershell.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 1960 wrote to memory of 1492	1960	NOSU.exe	85
PID 1960 wrote to memory of 1492	1960	NOSU.exe	85
PID 1960 wrote to memory of 1492	1960	NOSU.exe	85
PID 1492 wrote to memory of 3040	1492	powershell.exe	89
PID 1492 wrote to memory of 3040	1492	powershell.exe	89
PID 1492 wrote to memory of 3040	1492	powershell.exe	89
PID 1960 wrote to memory of 4088	1960	NOSU.exe	90
PID 1960 wrote to memory of 4088	1960	NOSU.exe	90
PID 1960 wrote to memory of 4088	1960	NOSU.exe	90
PID 4088 wrote to memory of 668	4088	powershell.exe	92
PID 4088 wrote to memory of 668	4088	powershell.exe	92
PID 4088 wrote to memory of 668	4088	powershell.exe	92
PID 1960 wrote to memory of 1572	1960	NOSU.exe	93
PID 1960 wrote to memory of 1572	1960	NOSU.exe	93
PID 1960 wrote to memory of 1572	1960	NOSU.exe	93
PID 1572 wrote to memory of 2948	1572	powershell.exe	95
PID 1572 wrote to memory of 2948	1572	powershell.exe	95
PID 1572 wrote to memory of 2948	1572	powershell.exe	95
PID 1960 wrote to memory of 1740	1960	NOSU.exe	96
PID 1960 wrote to memory of 1740	1960	NOSU.exe	96
PID 1960 wrote to memory of 1740	1960	NOSU.exe	96

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:1960
- 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:1492
- - 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:3040
- 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:4088
- - 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:668
- 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:1572
- - 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:2948
- 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:1740

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

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Downloads

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

Filesize
2KB

MD5
3d086a433708053f9bf9523e1d87a4e8

SHA1
b3ab5d4f282a4c8fe8c3005b8a557ed5a0e37f28

SHA256
6f8fd1b8d9788ad54eaeee329232187e24b7b43393a01aeba2d6e9675231fb69

SHA512
931ae42b4c68a4507ff2342332b08eb407050d47cf4176137ea022d0f6e513c689e998445a04c6d18d4877391705c586bfce0234632b898d41aaed0957996dfd

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

Filesize
11KB

MD5
9dd24296819802c31f95895ac4882b62

SHA1
fbdf11b70c6453e3cf7ed10261f471f5d2b53fc7

SHA256
b651f01851b48596bf50b45d1047db8087a4e072d867177d8686f9a0fb93c67a

SHA512
7e0a731cf8aefd175bf968a969d1d402d3342ce43f55854a686705084d99874ecbb13d5ab1985428519c1f187922bf62456c0ee59956cd8c6d14696e0f2aa449

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

Filesize
11KB

MD5
2bc614b7d496fe0473fc56993cab8f84

SHA1
0a7936fe1b50ce0c0823bfe9aac83b0427d7655d

SHA256
d6fdb49941ab8a0c32f902304ea27b2d53e0094b7cc083528718f7fead823fdb

SHA512
2879ac0d1aff0ac2dfccd5b81a497b1d629bba7b69a4f76d627fdbb635c47bab47b7c9ed94534d275e1d386b33dd1cccfcf59e0ce471cbbb0553ccdd9801c426

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

Filesize
11KB

MD5
558b1b53887bfe142da943f6faa3b6dd

SHA1
0d401018c2b6cbf24efda6c13a04288cca3bb89b

SHA256
e733cb1a712d466abbde7d89e79d5e0740c55c524efbf04041d701da8cc7414f

SHA512
8635bd343e442ab93f4b6255844a20666ae4d352387b4f250debc80a8393e94a742291cbfa113820ffe0fef44df19f8b2f1b963316b50ca292854720b951b45c

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_kvjwfq1b.21k.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/668-88-0x00000000701F0000-0x000000007023C000-memory.dmp

Filesize
304KB

Download
memory/1492-66-0x0000000074470000-0x0000000074C20000-memory.dmp

Filesize
7.7MB

Download
memory/1492-7-0x0000000074470000-0x0000000074C20000-memory.dmp

Filesize
7.7MB

Download
memory/1492-9-0x0000000005A90000-0x0000000005AF6000-memory.dmp

Filesize
408KB

Download
memory/1492-8-0x00000000059B0000-0x0000000005A16000-memory.dmp

Filesize
408KB

Download
memory/1492-6-0x0000000005900000-0x0000000005922000-memory.dmp

Filesize
136KB

Download
memory/1492-20-0x0000000006320000-0x0000000006674000-memory.dmp

Filesize
3.3MB

Download
memory/1492-19-0x0000000074470000-0x0000000074C20000-memory.dmp

Filesize
7.7MB

Download
memory/1492-21-0x0000000006900000-0x000000000691E000-memory.dmp

Filesize
120KB

Download
memory/1492-22-0x0000000006930000-0x000000000697C000-memory.dmp

Filesize
304KB

Download
memory/1492-4-0x0000000005B70000-0x0000000006198000-memory.dmp

Filesize
6.2MB

Download
memory/1492-2-0x0000000005340000-0x0000000005376000-memory.dmp

Filesize
216KB

Download
memory/1492-5-0x0000000074470000-0x0000000074C20000-memory.dmp

Filesize
7.7MB

Download
memory/1572-110-0x00000000057A0000-0x0000000005AF4000-memory.dmp

Filesize
3.3MB

Download
memory/1960-135-0x0000000005750000-0x0000000005CF4000-memory.dmp

Filesize
5.6MB

Download
memory/1960-134-0x0000000005100000-0x000000000519C000-memory.dmp

Filesize
624KB

Download
memory/1960-1-0x0000000000350000-0x000000000036A000-memory.dmp

Filesize
104KB

Download
memory/1960-136-0x0000000005340000-0x00000000053D2000-memory.dmp

Filesize
584KB

Download
memory/1960-3-0x0000000074470000-0x0000000074C20000-memory.dmp

Filesize
7.7MB

Download
memory/1960-65-0x000000007447E000-0x000000007447F000-memory.dmp

Filesize
4KB

Download
memory/1960-67-0x0000000074470000-0x0000000074C20000-memory.dmp

Filesize
7.7MB

Download
memory/1960-0-0x000000007447E000-0x000000007447F000-memory.dmp

Filesize
4KB

Download
memory/1960-137-0x00000000060B0000-0x00000000060BA000-memory.dmp

Filesize
40KB

Download
memory/2948-121-0x00000000701F0000-0x000000007023C000-memory.dmp

Filesize
304KB

Download
memory/3040-34-0x0000000007080000-0x00000000070B2000-memory.dmp

Filesize
200KB

Download
memory/3040-50-0x0000000007870000-0x0000000007EEA000-memory.dmp

Filesize
6.5MB

Download
memory/3040-57-0x0000000007590000-0x00000000075AA000-memory.dmp

Filesize
104KB

Download
memory/3040-58-0x0000000007570000-0x0000000007578000-memory.dmp

Filesize
32KB

Download
memory/3040-61-0x0000000074470000-0x0000000074C20000-memory.dmp

Filesize
7.7MB

Download
memory/3040-55-0x0000000007480000-0x000000000748E000-memory.dmp

Filesize
56KB

Download
memory/3040-54-0x0000000007450000-0x0000000007461000-memory.dmp

Filesize
68KB

Download
memory/3040-53-0x00000000074B0000-0x0000000007546000-memory.dmp

Filesize
600KB

Download
memory/3040-52-0x00000000072A0000-0x00000000072AA000-memory.dmp

Filesize
40KB

Download
memory/3040-56-0x0000000007490000-0x00000000074A4000-memory.dmp

Filesize
80KB

Download
memory/3040-24-0x0000000074470000-0x0000000074C20000-memory.dmp

Filesize
7.7MB

Download
memory/3040-51-0x0000000007230000-0x000000000724A000-memory.dmp

Filesize
104KB

Download
memory/3040-49-0x0000000074470000-0x0000000074C20000-memory.dmp

Filesize
7.7MB

Download
memory/3040-48-0x00000000070F0000-0x0000000007193000-memory.dmp

Filesize
652KB

Download
memory/3040-47-0x0000000074470000-0x0000000074C20000-memory.dmp

Filesize
7.7MB

Download
memory/3040-46-0x00000000070C0000-0x00000000070DE000-memory.dmp

Filesize
120KB

Download
memory/3040-45-0x0000000074470000-0x0000000074C20000-memory.dmp

Filesize
7.7MB

Download
memory/3040-35-0x00000000701F0000-0x000000007023C000-memory.dmp

Filesize
304KB

Download
memory/3040-23-0x0000000074470000-0x0000000074C20000-memory.dmp

Filesize
7.7MB

Download
memory/4088-77-0x00000000062F0000-0x0000000006644000-memory.dmp

Filesize
3.3MB

Download