njrat | 138f3ba0bc1a8074a50b7c2d6c219c573987495dd897e594549bd2950f5d4072

Analysis

max time kernel
150s
max time network
154s
platform
windows10-2004_x64
resource
win10v2004-20231023-en
resource tags

arch:x64arch:x86image:win10v2004-20231023-enlocale:en-usos:windows10-2004-x64system
submitted
31-10-2023 07:08

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General

Target

bRcl.exe
Size

23KB
MD5

4147636832178d0029c0728397c563e3
SHA1

4caa679de73f4733eef673228164f0e2da433ff7
SHA256

138f3ba0bc1a8074a50b7c2d6c219c573987495dd897e594549bd2950f5d4072
SHA512

1c24b5834cfb88f9d0e5faf377829fc826a72167a9704669657b5a5388d1bd14e667e0581ecda207e1fd27ec038944b9661dd8510de065fd0913c47c395ba397
SSDEEP

384:boWSkWHa55BgDVRGipkItzY6vZg36Eh7FpmRvR6JZlbw8hqIusZzZPF:0Juk9pHRpcnuK

Score

10^/10

njrat evasion trojan

Malware Config

Signatures

njRAT/Bladabindi
Widely used RAT written in .NET.
trojan njrat
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Windows Service
T1543.003

Processes:

netsh.exe

pid process

2988 netsh.exe

pid	process
2988	netsh.exe

Drops startup file 2 IoCs

Processes:

bRcl.exe

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\86230292ec2540faa33eb4bb71952fb5.exe	bRcl.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\86230292ec2540faa33eb4bb71952fb5.exe	bRcl.exe

Suspicious use of AdjustPrivilegeToken 35 IoCs

Processes:

bRcl.exe

description	pid	process
Token: SeDebugPrivilege	4436	bRcl.exe
Token: 33	4436	bRcl.exe
Token: SeIncBasePriorityPrivilege	4436	bRcl.exe
Token: 33	4436	bRcl.exe
Token: SeIncBasePriorityPrivilege	4436	bRcl.exe
Token: 33	4436	bRcl.exe
Token: SeIncBasePriorityPrivilege	4436	bRcl.exe
Token: 33	4436	bRcl.exe
Token: SeIncBasePriorityPrivilege	4436	bRcl.exe
Token: 33	4436	bRcl.exe
Token: SeIncBasePriorityPrivilege	4436	bRcl.exe
Token: 33	4436	bRcl.exe
Token: SeIncBasePriorityPrivilege	4436	bRcl.exe
Token: 33	4436	bRcl.exe
Token: SeIncBasePriorityPrivilege	4436	bRcl.exe
Token: 33	4436	bRcl.exe
Token: SeIncBasePriorityPrivilege	4436	bRcl.exe
Token: 33	4436	bRcl.exe
Token: SeIncBasePriorityPrivilege	4436	bRcl.exe
Token: 33	4436	bRcl.exe
Token: SeIncBasePriorityPrivilege	4436	bRcl.exe
Token: 33	4436	bRcl.exe
Token: SeIncBasePriorityPrivilege	4436	bRcl.exe
Token: 33	4436	bRcl.exe
Token: SeIncBasePriorityPrivilege	4436	bRcl.exe
Token: 33	4436	bRcl.exe
Token: SeIncBasePriorityPrivilege	4436	bRcl.exe
Token: 33	4436	bRcl.exe
Token: SeIncBasePriorityPrivilege	4436	bRcl.exe
Token: 33	4436	bRcl.exe
Token: SeIncBasePriorityPrivilege	4436	bRcl.exe
Token: 33	4436	bRcl.exe
Token: SeIncBasePriorityPrivilege	4436	bRcl.exe
Token: 33	4436	bRcl.exe
Token: SeIncBasePriorityPrivilege	4436	bRcl.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

bRcl.exe

description	pid	process	target process
PID 4436 wrote to memory of 2988	4436	bRcl.exe	netsh.exe
PID 4436 wrote to memory of 2988	4436	bRcl.exe	netsh.exe
PID 4436 wrote to memory of 2988	4436	bRcl.exe	netsh.exe

C:\Users\Admin\AppData\Local\Temp\bRcl.exe
"C:\Users\Admin\AppData\Local\Temp\bRcl.exe"
1⤵
- Drops startup file
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4436

C:\Windows\SysWOW64\netsh.exe
netsh firewall add allowedprogram "C:\Users\Admin\AppData\Local\Temp\bRcl.exe" "bRcl.exe" ENABLE
2⤵
- Modifies Windows Firewall
PID:2988

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

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

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

memory/4436-0-0x0000000074B60000-0x0000000075111000-memory.dmp

Filesize
5.7MB

Download
memory/4436-1-0x0000000074B60000-0x0000000075111000-memory.dmp

Filesize
5.7MB

Download
memory/4436-2-0x0000000000C00000-0x0000000000C10000-memory.dmp

Filesize
64KB

Download
memory/4436-3-0x0000000074B60000-0x0000000075111000-memory.dmp

Filesize
5.7MB

Download
memory/4436-4-0x0000000000C00000-0x0000000000C10000-memory.dmp

Filesize
64KB

Download
memory/4436-6-0x0000000000C00000-0x0000000000C10000-memory.dmp

Filesize
64KB

Download
memory/4436-7-0x0000000000C00000-0x0000000000C10000-memory.dmp

Filesize
64KB

Download