njrat | 3ba9088ef4662608ccdb45a1333d4a5c9970fa90acdfdff4787233b8e4aa23d4

Analysis

max time kernel
122s
max time network
127s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
09-11-2024 13:59

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General

Target

Bootstrapper.exe
Size

37KB
MD5

e08d7967557238a0ee488e405f7865dd
SHA1

b4428239dff65be117076a6d2169c1f5488e098e
SHA256

3ba9088ef4662608ccdb45a1333d4a5c9970fa90acdfdff4787233b8e4aa23d4
SHA512

f9d197250afbdffb9d7081f87b94687d1cd7d53f7901e0b402444f5e8f9c9df76b8b1ff25d44246231468de3a13bfa5b0d61755bd341bac191bef7ba0d51da81
SSDEEP

384:71/yi00nCVpd3vVmyhKrrvFcCRYc2/efurAF+rMRTyN/0L+EcoinblneHQM3epzR:xHANVdhKr7FcRB/eWrM+rMRa8NuGItN

Score

10^/10

njrat krasus-pc discovery evasion persistence privilege_escalation trojan

Malware Config

Extracted

Family

njrat

Version

im523

Botnet

Krasus-Pc

mingrelian.duckdns.org:4444

Mutex

cf0442d73ab4fa4b3573bef8feb3ee75

Attributes

reg_key
cf0442d73ab4fa4b3573bef8feb3ee75
splitter
|'|'|

Signatures

Njrat family
njrat
njRAT/Bladabindi
Widely used RAT written in .NET.
trojan njrat

Modifies Windows Firewall 2 TTPs 2 IoCs

evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

Processes:

netsh.exenetsh.exe

pid	Process
2804	netsh.exe
700	netsh.exe

Drops startup file 2 IoCs

Processes:

RtkAudioService64.exe

description	ioc	Process
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\cf0442d73ab4fa4b3573bef8feb3ee75.exe	RtkAudioService64.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\cf0442d73ab4fa4b3573bef8feb3ee75.exe	RtkAudioService64.exe

Executes dropped EXE 1 IoCs

Processes:

RtkAudioService64.exe

pid	Process
2060	RtkAudioService64.exe

Loads dropped DLL 1 IoCs

Processes:

Bootstrapper.exe

pid	Process
2864	Bootstrapper.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

RtkAudioService64.exe

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000\Software\Microsoft\Windows\CurrentVersion\Run\cf0442d73ab4fa4b3573bef8feb3ee75 = "\"C:\\Users\\Admin\\RtkAudioService64.exe\" .."	RtkAudioService64.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\cf0442d73ab4fa4b3573bef8feb3ee75 = "\"C:\\Users\\Admin\\RtkAudioService64.exe\" .."	RtkAudioService64.exe

Drops autorun.inf file 1 TTPs 5 IoCs

Malware can abuse Windows Autorun to spread further via attached volumes.

Replication Through Removable Media

T1091

Processes:

RtkAudioService64.exe

description	ioc	Process
File created	C:\autorun.inf	RtkAudioService64.exe
File opened for modification	C:\autorun.inf	RtkAudioService64.exe
File created	D:\autorun.inf	RtkAudioService64.exe
File created	F:\autorun.inf	RtkAudioService64.exe
File opened for modification	F:\autorun.inf	RtkAudioService64.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Event Triggered Execution: Netsh Helper DLL 1 TTPs 6 IoCs

Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

persistence privilege_escalation

Netsh Helper DLL

T1546.007

Processes:

netsh.exenetsh.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\NetSh	netsh.exe
Key queried	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\NetSh	netsh.exe
Key value enumerated	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\NetSh	netsh.exe
Key opened	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\NetSh	netsh.exe
Key queried	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\NetSh	netsh.exe
Key value enumerated	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\NetSh	netsh.exe

System Location Discovery: System Language Discovery 1 TTPs 6 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

Processes:

Bootstrapper.exeRtkAudioService64.exenetsh.exenetsh.execmd.exePING.EXE

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Bootstrapper.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RtkAudioService64.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

Processes:

cmd.exePING.EXE

pid	Process
2924	cmd.exe
1440	PING.EXE

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

Processes:

PING.EXE

pid	Process
1440	PING.EXE

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

RtkAudioService64.exe

pid	Process
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe
2060	RtkAudioService64.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

RtkAudioService64.exe

pid	Process
2060	RtkAudioService64.exe

Suspicious use of AdjustPrivilegeToken 23 IoCs

Processes:

RtkAudioService64.exe

description	pid	Process
Token: SeDebugPrivilege	2060	RtkAudioService64.exe
Token: 33	2060	RtkAudioService64.exe
Token: SeIncBasePriorityPrivilege	2060	RtkAudioService64.exe
Token: 33	2060	RtkAudioService64.exe
Token: SeIncBasePriorityPrivilege	2060	RtkAudioService64.exe
Token: 33	2060	RtkAudioService64.exe
Token: SeIncBasePriorityPrivilege	2060	RtkAudioService64.exe
Token: 33	2060	RtkAudioService64.exe
Token: SeIncBasePriorityPrivilege	2060	RtkAudioService64.exe
Token: 33	2060	RtkAudioService64.exe
Token: SeIncBasePriorityPrivilege	2060	RtkAudioService64.exe
Token: 33	2060	RtkAudioService64.exe
Token: SeIncBasePriorityPrivilege	2060	RtkAudioService64.exe
Token: 33	2060	RtkAudioService64.exe
Token: SeIncBasePriorityPrivilege	2060	RtkAudioService64.exe
Token: 33	2060	RtkAudioService64.exe
Token: SeIncBasePriorityPrivilege	2060	RtkAudioService64.exe
Token: 33	2060	RtkAudioService64.exe
Token: SeIncBasePriorityPrivilege	2060	RtkAudioService64.exe
Token: 33	2060	RtkAudioService64.exe
Token: SeIncBasePriorityPrivilege	2060	RtkAudioService64.exe
Token: 33	2060	RtkAudioService64.exe
Token: SeIncBasePriorityPrivilege	2060	RtkAudioService64.exe

Suspicious use of WriteProcessMemory 20 IoCs

Processes:

Bootstrapper.exeRtkAudioService64.execmd.exe

description	pid	Process	procid_target
PID 2864 wrote to memory of 2060	2864	Bootstrapper.exe	30
PID 2864 wrote to memory of 2060	2864	Bootstrapper.exe	30
PID 2864 wrote to memory of 2060	2864	Bootstrapper.exe	30
PID 2864 wrote to memory of 2060	2864	Bootstrapper.exe	30
PID 2060 wrote to memory of 2804	2060	RtkAudioService64.exe	31
PID 2060 wrote to memory of 2804	2060	RtkAudioService64.exe	31
PID 2060 wrote to memory of 2804	2060	RtkAudioService64.exe	31
PID 2060 wrote to memory of 2804	2060	RtkAudioService64.exe	31
PID 2060 wrote to memory of 700	2060	RtkAudioService64.exe	35
PID 2060 wrote to memory of 700	2060	RtkAudioService64.exe	35
PID 2060 wrote to memory of 700	2060	RtkAudioService64.exe	35
PID 2060 wrote to memory of 700	2060	RtkAudioService64.exe	35
PID 2060 wrote to memory of 2924	2060	RtkAudioService64.exe	37
PID 2060 wrote to memory of 2924	2060	RtkAudioService64.exe	37
PID 2060 wrote to memory of 2924	2060	RtkAudioService64.exe	37
PID 2060 wrote to memory of 2924	2060	RtkAudioService64.exe	37
PID 2924 wrote to memory of 1440	2924	cmd.exe	39
PID 2924 wrote to memory of 1440	2924	cmd.exe	39
PID 2924 wrote to memory of 1440	2924	cmd.exe	39
PID 2924 wrote to memory of 1440	2924	cmd.exe	39

C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe
"C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2864
- C:\Users\Admin\RtkAudioService64.exe
  "C:\Users\Admin\RtkAudioService64.exe"
  2⤵
  - Drops startup file
  - Executes dropped EXE
  - Adds Run key to start application
  - Drops autorun.inf file
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2060
- - C:\Windows\SysWOW64\netsh.exe
    netsh firewall add allowedprogram "C:\Users\Admin\RtkAudioService64.exe" "RtkAudioService64.exe" ENABLE
    3⤵
    - Modifies Windows Firewall
    - Event Triggered Execution: Netsh Helper DLL
    - System Location Discovery: System Language Discovery
    PID:2804
- - C:\Windows\SysWOW64\netsh.exe
    netsh firewall delete allowedprogram "C:\Users\Admin\RtkAudioService64.exe"
    3⤵
    - Modifies Windows Firewall
    - Event Triggered Execution: Netsh Helper DLL
    - System Location Discovery: System Language Discovery
    PID:700
- - C:\Windows\SysWOW64\cmd.exe
    cmd.exe /k ping 0 & del "C:\Users\Admin\RtkAudioService64.exe" & exit
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:2924
  - - C:\Windows\SysWOW64\PING.EXE
      ping 0
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:1440

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Replication Through Removable Media

T1091

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Event Triggered Execution

T1546

Netsh Helper DLL

T1546.007

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Event Triggered Execution

T1546

Netsh Helper DLL

T1546.007

Defense Evasion

Impair Defenses

T1562

Disable or Modify System Firewall

T1562.004

Modify Registry

T1112

Credential Access

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Replication Through Removable Media

T1091

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

\Users\Admin\RtkAudioService64.exe

Filesize
37KB

MD5
e08d7967557238a0ee488e405f7865dd

SHA1
b4428239dff65be117076a6d2169c1f5488e098e

SHA256
3ba9088ef4662608ccdb45a1333d4a5c9970fa90acdfdff4787233b8e4aa23d4

SHA512
f9d197250afbdffb9d7081f87b94687d1cd7d53f7901e0b402444f5e8f9c9df76b8b1ff25d44246231468de3a13bfa5b0d61755bd341bac191bef7ba0d51da81

Download Submit
memory/2060-11-0x0000000074F00000-0x00000000754AB000-memory.dmp

Filesize
5.7MB

Download
memory/2060-12-0x0000000074F00000-0x00000000754AB000-memory.dmp

Filesize
5.7MB

Download
memory/2060-13-0x0000000074F00000-0x00000000754AB000-memory.dmp

Filesize
5.7MB

Download
memory/2060-23-0x0000000074F00000-0x00000000754AB000-memory.dmp

Filesize
5.7MB

Download
memory/2060-26-0x0000000074F00000-0x00000000754AB000-memory.dmp

Filesize
5.7MB

Download
memory/2864-0-0x0000000074F01000-0x0000000074F02000-memory.dmp

Filesize
4KB

Download
memory/2864-1-0x0000000074F00000-0x00000000754AB000-memory.dmp

Filesize
5.7MB

Download
memory/2864-2-0x0000000074F00000-0x00000000754AB000-memory.dmp

Filesize
5.7MB

Download
memory/2864-10-0x0000000074F00000-0x00000000754AB000-memory.dmp

Filesize
5.7MB

Download