njrat | cbbd4d987c1f2368de89953f3d2ab06a803806faaab1d116d6c72cf11a93cbb2

Analysis

max time kernel
150s
max time network
149s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
24-11-2024 13:22

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General

Target

Bootstrapper.exe
Size

37KB
MD5

92fd66073b9a4f83ee5257d4dfc611fb
SHA1

87377414dd581082a1e5d26633f2aa9838d26062
SHA256

cbbd4d987c1f2368de89953f3d2ab06a803806faaab1d116d6c72cf11a93cbb2
SHA512

f0e24cac627234e2556e7ce1b1634c32f0b17380850e3d956d35d6f92d1489dcad2fdcb799abbdf0d8169dff0d9c3da7a5672bf84899481368ed6909d6b19c95
SSDEEP

768:Ob3MDF3lFdS7IVW5mae2rM+rMRa8Nuvyt:Ob6F3lPSUVW5op+gRJNE

Score

10^/10

njrat boykisser discovery evasion persistence privilege_escalation trojan

Malware Config

Extracted

Family

njrat

Version

im523

Botnet

boykisser

eg-womens.gl.at.ply.gg:7999

Mutex

2be7fcfaf2fb2c0121ad0a1c26b16a25

Attributes

reg_key
2be7fcfaf2fb2c0121ad0a1c26b16a25
splitter
|'|'|

Signatures

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

Modifies Windows Firewall 2 TTPs 1 IoCs

evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
2864	netsh.exe

Drops startup file 2 IoCs

description	ioc	Process
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\2be7fcfaf2fb2c0121ad0a1c26b16a25.exe	COM Surrogate.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\2be7fcfaf2fb2c0121ad0a1c26b16a25.exe	COM Surrogate.exe

Executes dropped EXE 1 IoCs

pid	Process
2352	COM Surrogate.exe

Loads dropped DLL 1 IoCs

pid	Process
1260	Bootstrapper.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000\Software\Microsoft\Windows\CurrentVersion\Run\2be7fcfaf2fb2c0121ad0a1c26b16a25 = "\"C:\\ProgramData\\COM Surrogate.exe\" .."	COM Surrogate.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\2be7fcfaf2fb2c0121ad0a1c26b16a25 = "\"C:\\ProgramData\\COM Surrogate.exe\" .."	COM Surrogate.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

description	ioc	Process
File created	C:\autorun.inf	COM Surrogate.exe
File opened for modification	C:\autorun.inf	COM Surrogate.exe
File created	D:\autorun.inf	COM Surrogate.exe
File created	F:\autorun.inf	COM Surrogate.exe
File opened for modification	F:\autorun.inf	COM Surrogate.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 3 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

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

System Location Discovery: System Language Discovery 1 TTPs 4 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	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	taskkill.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Bootstrapper.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	COM Surrogate.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
2728	taskkill.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe
2352	COM Surrogate.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2352	COM Surrogate.exe

Suspicious use of AdjustPrivilegeToken 36 IoCs

description	pid	Process
Token: SeDebugPrivilege	2352	COM Surrogate.exe
Token: SeDebugPrivilege	2728	taskkill.exe
Token: 33	2352	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2352	COM Surrogate.exe
Token: 33	2352	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2352	COM Surrogate.exe
Token: 33	2352	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2352	COM Surrogate.exe
Token: 33	2352	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2352	COM Surrogate.exe
Token: 33	2352	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2352	COM Surrogate.exe
Token: 33	2352	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2352	COM Surrogate.exe
Token: 33	2352	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2352	COM Surrogate.exe
Token: 33	2352	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2352	COM Surrogate.exe
Token: 33	2352	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2352	COM Surrogate.exe
Token: 33	2352	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2352	COM Surrogate.exe
Token: 33	2352	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2352	COM Surrogate.exe
Token: 33	2352	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2352	COM Surrogate.exe
Token: 33	2352	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2352	COM Surrogate.exe
Token: 33	2352	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2352	COM Surrogate.exe
Token: 33	2352	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2352	COM Surrogate.exe
Token: 33	2352	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2352	COM Surrogate.exe
Token: 33	2352	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2352	COM Surrogate.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 1260 wrote to memory of 2352	1260	Bootstrapper.exe	30
PID 1260 wrote to memory of 2352	1260	Bootstrapper.exe	30
PID 1260 wrote to memory of 2352	1260	Bootstrapper.exe	30
PID 1260 wrote to memory of 2352	1260	Bootstrapper.exe	30
PID 2352 wrote to memory of 2864	2352	COM Surrogate.exe	32
PID 2352 wrote to memory of 2864	2352	COM Surrogate.exe	32
PID 2352 wrote to memory of 2864	2352	COM Surrogate.exe	32
PID 2352 wrote to memory of 2864	2352	COM Surrogate.exe	32
PID 2352 wrote to memory of 2728	2352	COM Surrogate.exe	34
PID 2352 wrote to memory of 2728	2352	COM Surrogate.exe	34
PID 2352 wrote to memory of 2728	2352	COM Surrogate.exe	34
PID 2352 wrote to memory of 2728	2352	COM Surrogate.exe	34

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:1260
- C:\ProgramData\COM Surrogate.exe
  "C:\ProgramData\COM Surrogate.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:2352
- - C:\Windows\SysWOW64\netsh.exe
    netsh firewall add allowedprogram "C:\ProgramData\COM Surrogate.exe" "COM Surrogate.exe" ENABLE
    3⤵
    - Modifies Windows Firewall
    - Event Triggered Execution: Netsh Helper DLL
    - System Location Discovery: System Language Discovery
    PID:2864
- - C:\Windows\SysWOW64\taskkill.exe
    taskkill /F /IM SecHealthUI.exe
    3⤵
    - System Location Discovery: System Language Discovery
    - Kills process with taskkill
    - Suspicious use of AdjustPrivilegeToken
    PID:2728

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

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Replication Through Removable Media

T1091

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

\ProgramData\COM Surrogate.exe

Filesize
37KB

MD5
92fd66073b9a4f83ee5257d4dfc611fb

SHA1
87377414dd581082a1e5d26633f2aa9838d26062

SHA256
cbbd4d987c1f2368de89953f3d2ab06a803806faaab1d116d6c72cf11a93cbb2

SHA512
f0e24cac627234e2556e7ce1b1634c32f0b17380850e3d956d35d6f92d1489dcad2fdcb799abbdf0d8169dff0d9c3da7a5672bf84899481368ed6909d6b19c95

Download Submit
memory/1260-0-0x0000000074FC1000-0x0000000074FC2000-memory.dmp

Filesize
4KB

Download
memory/1260-1-0x0000000074FC0000-0x000000007556B000-memory.dmp

Filesize
5.7MB

Download
memory/1260-2-0x0000000074FC0000-0x000000007556B000-memory.dmp

Filesize
5.7MB

Download
memory/1260-10-0x0000000074FC0000-0x000000007556B000-memory.dmp

Filesize
5.7MB

Download
memory/2352-11-0x0000000074FC0000-0x000000007556B000-memory.dmp

Filesize
5.7MB

Download
memory/2352-12-0x0000000074FC0000-0x000000007556B000-memory.dmp

Filesize
5.7MB

Download
memory/2352-13-0x0000000074FC0000-0x000000007556B000-memory.dmp

Filesize
5.7MB

Download
memory/2352-23-0x0000000074FC0000-0x000000007556B000-memory.dmp

Filesize
5.7MB

Download