njrat | 611fe530fb6e67415f6a5ed53e1961180fcb89bb1caab4fed64feab511a89813

Analysis

max time kernel
150s
max time network
138s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
23-11-2024 21:13

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General

Target

Accountbringer.exe
Size

37KB
MD5

fc04578c59cd41466d533cbcd7157282
SHA1

201be3e8474ca4bfe58fd5761ea62c42645d7fd0
SHA256

611fe530fb6e67415f6a5ed53e1961180fcb89bb1caab4fed64feab511a89813
SHA512

6c661d6c05e7729a1f4abd869b2e5b24cf2b0393f65d6e36c3f7c34502dd02f91b414cc08809a12209d7decd8a2250939f4f1ba7430e472e515a4f7816340f2b
SSDEEP

768:fb3MDF3lFdS7IVW5maePrM+rMRa8Nuv/t:fb6F3lPSUVW5oQ+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

Processes:

netsh.exe

pid	Process
2984	netsh.exe

Drops startup file 2 IoCs

Processes:

COM Surrogate.exe

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

Executes dropped EXE 1 IoCs

Processes:

COM Surrogate.exe

pid	Process
2924	COM Surrogate.exe

Loads dropped DLL 1 IoCs

Processes:

Accountbringer.exe

pid	Process
1604	Accountbringer.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

COM Surrogate.exe

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2039016743-699959520-214465309-1000\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

Processes:

COM Surrogate.exe

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

Processes:

netsh.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

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

Processes:

taskkill.exeAccountbringer.exeCOM Surrogate.exenetsh.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	taskkill.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Accountbringer.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	COM Surrogate.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe

Kills process with taskkill 1 IoCs

evasion

Processes:

taskkill.exe

pid	Process
2840	taskkill.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

COM Surrogate.exe

pid	Process
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe
2924	COM Surrogate.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

COM Surrogate.exe

pid	Process
2924	COM Surrogate.exe

Suspicious use of AdjustPrivilegeToken 36 IoCs

Processes:

COM Surrogate.exetaskkill.exe

description	pid	Process
Token: SeDebugPrivilege	2924	COM Surrogate.exe
Token: SeDebugPrivilege	2840	taskkill.exe
Token: 33	2924	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2924	COM Surrogate.exe
Token: 33	2924	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2924	COM Surrogate.exe
Token: 33	2924	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2924	COM Surrogate.exe
Token: 33	2924	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2924	COM Surrogate.exe
Token: 33	2924	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2924	COM Surrogate.exe
Token: 33	2924	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2924	COM Surrogate.exe
Token: 33	2924	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2924	COM Surrogate.exe
Token: 33	2924	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2924	COM Surrogate.exe
Token: 33	2924	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2924	COM Surrogate.exe
Token: 33	2924	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2924	COM Surrogate.exe
Token: 33	2924	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2924	COM Surrogate.exe
Token: 33	2924	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2924	COM Surrogate.exe
Token: 33	2924	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2924	COM Surrogate.exe
Token: 33	2924	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2924	COM Surrogate.exe
Token: 33	2924	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2924	COM Surrogate.exe
Token: 33	2924	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2924	COM Surrogate.exe
Token: 33	2924	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2924	COM Surrogate.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

Accountbringer.exeCOM Surrogate.exe

description	pid	Process	procid_target
PID 1604 wrote to memory of 2924	1604	Accountbringer.exe	30
PID 1604 wrote to memory of 2924	1604	Accountbringer.exe	30
PID 1604 wrote to memory of 2924	1604	Accountbringer.exe	30
PID 1604 wrote to memory of 2924	1604	Accountbringer.exe	30
PID 2924 wrote to memory of 2984	2924	COM Surrogate.exe	31
PID 2924 wrote to memory of 2984	2924	COM Surrogate.exe	31
PID 2924 wrote to memory of 2984	2924	COM Surrogate.exe	31
PID 2924 wrote to memory of 2984	2924	COM Surrogate.exe	31
PID 2924 wrote to memory of 2840	2924	COM Surrogate.exe	33
PID 2924 wrote to memory of 2840	2924	COM Surrogate.exe	33
PID 2924 wrote to memory of 2840	2924	COM Surrogate.exe	33
PID 2924 wrote to memory of 2840	2924	COM Surrogate.exe	33

C:\Users\Admin\AppData\Local\Temp\Accountbringer.exe
"C:\Users\Admin\AppData\Local\Temp\Accountbringer.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1604
- 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:2924
- - 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:2984
- - 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:2840

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

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Downloads

\ProgramData\COM Surrogate.exe

Filesize
37KB

MD5
fc04578c59cd41466d533cbcd7157282

SHA1
201be3e8474ca4bfe58fd5761ea62c42645d7fd0

SHA256
611fe530fb6e67415f6a5ed53e1961180fcb89bb1caab4fed64feab511a89813

SHA512
6c661d6c05e7729a1f4abd869b2e5b24cf2b0393f65d6e36c3f7c34502dd02f91b414cc08809a12209d7decd8a2250939f4f1ba7430e472e515a4f7816340f2b

Download Submit
memory/1604-0-0x0000000074CD1000-0x0000000074CD2000-memory.dmp

Filesize
4KB

Download
memory/1604-1-0x0000000074CD0000-0x000000007527B000-memory.dmp

Filesize
5.7MB

Download
memory/1604-2-0x0000000074CD0000-0x000000007527B000-memory.dmp

Filesize
5.7MB

Download
memory/1604-10-0x0000000074CD0000-0x000000007527B000-memory.dmp

Filesize
5.7MB

Download
memory/2924-11-0x0000000074CD0000-0x000000007527B000-memory.dmp

Filesize
5.7MB

Download
memory/2924-12-0x0000000074CD0000-0x000000007527B000-memory.dmp

Filesize
5.7MB

Download
memory/2924-23-0x0000000074CD0000-0x000000007527B000-memory.dmp

Filesize
5.7MB

Download
memory/2924-22-0x0000000074CD0000-0x000000007527B000-memory.dmp

Filesize
5.7MB

Download