njrat | 0e798055549a18d74a4c26621e5925883c55a33f2be16cb4b79eeefd40c9dd0c

Reason

Machine shutdown

General

Target

7P7DYQVc.exe
Size

23KB
MD5

d350b0d6462773a8f98d60ec7ca993fe
SHA1

a8eced99a403074fd6be13a579df9a35acb7acf9
SHA256

0e798055549a18d74a4c26621e5925883c55a33f2be16cb4b79eeefd40c9dd0c
SHA512

4105c6a027a7e9b89f08cc635ea6cefab8f3c270b9ddb7915ef0232084cad96a1df3b328f97be653f7d5ccaa457396450d2189269ddf9379b24c5b182ca9e567

Score

10^/10

njrat bootkit evasion persistence ransomware trojan

Malware Config

Signatures

njRAT/Bladabindi
Widely used RAT written in .NET.
trojan njrat
Executes dropped EXE 1 IoCs

Processes:

csrss.exe

pid process

940 csrss.exe
Modifies WinLogon to allow AutoLogon 2 TTPs 1 IoCs
Enables rebooting of the machine without requiring login credentials.
ransomware bootkit

Winlogon Helper DLL
T1004

Modify Registry
T1112

Processes:

LogonUI.exe

description ioc process

Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\AutoLogonChecked LogonUI.exe
Modifies Windows Firewall 1 TTPs
evasion

Modify Existing Service
T1031

pid	process
940	csrss.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\AutoLogonChecked	LogonUI.exe

Drops startup file 2 IoCs

Processes:

csrss.exe

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\bd8a83ed8b02d3c995a02f159f9c2953.exe	csrss.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\bd8a83ed8b02d3c995a02f159f9c2953.exe	csrss.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

csrss.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run\bd8a83ed8b02d3c995a02f159f9c2953 = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\csrss.exe\" .."	csrss.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\bd8a83ed8b02d3c995a02f159f9c2953 = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\csrss.exe\" .."	csrss.exe

Modifies data under HKEY_USERS 15 IoCs

Processes:

LogonUI.exe

description	ioc	process
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292311040"	LogonUI.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = a6d8ff0076b9ed00429ce3000078d700005a9e000042750000264200f7630c00	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4288567808"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0"	LogonUI.exe

Suspicious use of AdjustPrivilegeToken 29 IoCs

Processes:

csrss.exe

description	pid	process
Token: SeDebugPrivilege	940	csrss.exe
Token: 33	940	csrss.exe
Token: SeIncBasePriorityPrivilege	940	csrss.exe
Token: 33	940	csrss.exe
Token: SeIncBasePriorityPrivilege	940	csrss.exe
Token: 33	940	csrss.exe
Token: SeIncBasePriorityPrivilege	940	csrss.exe
Token: 33	940	csrss.exe
Token: SeIncBasePriorityPrivilege	940	csrss.exe
Token: 33	940	csrss.exe
Token: SeIncBasePriorityPrivilege	940	csrss.exe
Token: 33	940	csrss.exe
Token: SeIncBasePriorityPrivilege	940	csrss.exe
Token: 33	940	csrss.exe
Token: SeIncBasePriorityPrivilege	940	csrss.exe
Token: 33	940	csrss.exe
Token: SeIncBasePriorityPrivilege	940	csrss.exe
Token: 33	940	csrss.exe
Token: SeIncBasePriorityPrivilege	940	csrss.exe
Token: 33	940	csrss.exe
Token: SeIncBasePriorityPrivilege	940	csrss.exe
Token: 33	940	csrss.exe
Token: SeIncBasePriorityPrivilege	940	csrss.exe
Token: 33	940	csrss.exe
Token: SeIncBasePriorityPrivilege	940	csrss.exe
Token: 33	940	csrss.exe
Token: SeIncBasePriorityPrivilege	940	csrss.exe
Token: 33	940	csrss.exe
Token: SeIncBasePriorityPrivilege	940	csrss.exe

Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

LogonUI.exe

pid process

516 LogonUI.exe
516 LogonUI.exe

pid	process
516	LogonUI.exe
516	LogonUI.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

7P7DYQVc.execsrss.exe

description	pid	process	target process
PID 2604 wrote to memory of 940	2604	7P7DYQVc.exe	csrss.exe
PID 2604 wrote to memory of 940	2604	7P7DYQVc.exe	csrss.exe
PID 2604 wrote to memory of 940	2604	7P7DYQVc.exe	csrss.exe
PID 940 wrote to memory of 2664	940	csrss.exe	netsh.exe
PID 940 wrote to memory of 2664	940	csrss.exe	netsh.exe
PID 940 wrote to memory of 2664	940	csrss.exe	netsh.exe

C:\Users\Admin\AppData\Local\Temp\7P7DYQVc.exe
"C:\Users\Admin\AppData\Local\Temp\7P7DYQVc.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2604

C:\Users\Admin\AppData\Local\Temp\csrss.exe
"C:\Users\Admin\AppData\Local\Temp\csrss.exe"
2⤵
- Executes dropped EXE
- Drops startup file
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:940

C:\Windows\SysWOW64\netsh.exe
netsh firewall add allowedprogram "C:\Users\Admin\AppData\Local\Temp\csrss.exe" "csrss.exe" ENABLE
3⤵
PID:2664

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x0 /state0:0xa3ad4055 /state1:0x41c64e6d
1⤵
- Modifies WinLogon to allow AutoLogon
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:516

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

1

T1004

Modify Existing Service

1

T1031

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

2

T1112

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\csrss.exe
MD5
d350b0d6462773a8f98d60ec7ca993fe

SHA1
a8eced99a403074fd6be13a579df9a35acb7acf9

SHA256
0e798055549a18d74a4c26621e5925883c55a33f2be16cb4b79eeefd40c9dd0c

SHA512
4105c6a027a7e9b89f08cc635ea6cefab8f3c270b9ddb7915ef0232084cad96a1df3b328f97be653f7d5ccaa457396450d2189269ddf9379b24c5b182ca9e567

Download Submit
C:\Users\Admin\AppData\Local\Temp\csrss.exe
MD5
d350b0d6462773a8f98d60ec7ca993fe

SHA1
a8eced99a403074fd6be13a579df9a35acb7acf9

SHA256
0e798055549a18d74a4c26621e5925883c55a33f2be16cb4b79eeefd40c9dd0c

SHA512
4105c6a027a7e9b89f08cc635ea6cefab8f3c270b9ddb7915ef0232084cad96a1df3b328f97be653f7d5ccaa457396450d2189269ddf9379b24c5b182ca9e567

Download Submit
memory/940-2-0x0000000000000000-mapping.dmp

Download
memory/2664-5-0x0000000000000000-mapping.dmp

Download

Resubmissions

Analysis

Sharing

Errors

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads