njrat | cea2e14387453a028cd6a95960bce28ed65c5c61d94b93defc4ddc94482477c1

Analysis

max time kernel
150s
max time network
153s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
28-12-2024 17:22

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General

Target

fixer.exe
Size

37KB
MD5

dcbe24f29c827478c6616974d7f6f83b
SHA1

2ae1cf5cad30e2cbdc794aca7ea3b7e7d11dce0f
SHA256

cea2e14387453a028cd6a95960bce28ed65c5c61d94b93defc4ddc94482477c1
SHA512

64dce5e86ed28db768d1d7cf50faf410ca4569a6da82665b2290ce4e70033d54bc316b952267a012fdf8be8b8b7e5a4eba4636525b2d53fbf37c483337f68fa1
SSDEEP

384:0a9SikSvmkO8IV+ytbNX0PrKs2MfErAF+rMRTyN/0L+EcoinblneHQM3epzXLNCi:lfIV1tbNX0elM8rM+rMRa8NuRft

Score

10^/10

njrat boykisser discovery evasion persistence privilege_escalation trojan

Malware Config

Extracted

Family

njrat

Version

im523

Botnet

boykisser

printer-nebraska.gl.at.ply.gg:50300

Mutex

79002caee528766a1ca30fecb0f3f819

Attributes

reg_key
79002caee528766a1ca30fecb0f3f819
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
2312	netsh.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\79002caee528766a1ca30fecb0f3f819.exe	COM Surrogate.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\79002caee528766a1ca30fecb0f3f819.exe	COM Surrogate.exe

Executes dropped EXE 1 IoCs

pid	Process
2184	COM Surrogate.exe

Loads dropped DLL 1 IoCs

pid	Process
1736	fixer.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-1-5-21-3692679935-4019334568-335155002-1000\Software\Microsoft\Windows\CurrentVersion\Run\79002caee528766a1ca30fecb0f3f819 = "\"C:\\ProgramData\\COM Surrogate.exe\" .."	COM Surrogate.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\79002caee528766a1ca30fecb0f3f819 = "\"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 opened for modification	F:\autorun.inf	COM Surrogate.exe
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

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	COM Surrogate.exe
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	fixer.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
3064	taskkill.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe
2184	COM Surrogate.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2184	COM Surrogate.exe

Suspicious use of AdjustPrivilegeToken 36 IoCs

description	pid	Process
Token: SeDebugPrivilege	2184	COM Surrogate.exe
Token: SeDebugPrivilege	3064	taskkill.exe
Token: 33	2184	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2184	COM Surrogate.exe
Token: 33	2184	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2184	COM Surrogate.exe
Token: 33	2184	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2184	COM Surrogate.exe
Token: 33	2184	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2184	COM Surrogate.exe
Token: 33	2184	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2184	COM Surrogate.exe
Token: 33	2184	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2184	COM Surrogate.exe
Token: 33	2184	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2184	COM Surrogate.exe
Token: 33	2184	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2184	COM Surrogate.exe
Token: 33	2184	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2184	COM Surrogate.exe
Token: 33	2184	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2184	COM Surrogate.exe
Token: 33	2184	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2184	COM Surrogate.exe
Token: 33	2184	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2184	COM Surrogate.exe
Token: 33	2184	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2184	COM Surrogate.exe
Token: 33	2184	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2184	COM Surrogate.exe
Token: 33	2184	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2184	COM Surrogate.exe
Token: 33	2184	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2184	COM Surrogate.exe
Token: 33	2184	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2184	COM Surrogate.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 1736 wrote to memory of 2184	1736	fixer.exe	30
PID 1736 wrote to memory of 2184	1736	fixer.exe	30
PID 1736 wrote to memory of 2184	1736	fixer.exe	30
PID 1736 wrote to memory of 2184	1736	fixer.exe	30
PID 2184 wrote to memory of 2312	2184	COM Surrogate.exe	31
PID 2184 wrote to memory of 2312	2184	COM Surrogate.exe	31
PID 2184 wrote to memory of 2312	2184	COM Surrogate.exe	31
PID 2184 wrote to memory of 2312	2184	COM Surrogate.exe	31
PID 2184 wrote to memory of 3064	2184	COM Surrogate.exe	33
PID 2184 wrote to memory of 3064	2184	COM Surrogate.exe	33
PID 2184 wrote to memory of 3064	2184	COM Surrogate.exe	33
PID 2184 wrote to memory of 3064	2184	COM Surrogate.exe	33

C:\Users\Admin\AppData\Local\Temp\fixer.exe
"C:\Users\Admin\AppData\Local\Temp\fixer.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1736
- 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:2184
- - 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:2312
- - 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:3064

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
dcbe24f29c827478c6616974d7f6f83b

SHA1
2ae1cf5cad30e2cbdc794aca7ea3b7e7d11dce0f

SHA256
cea2e14387453a028cd6a95960bce28ed65c5c61d94b93defc4ddc94482477c1

SHA512
64dce5e86ed28db768d1d7cf50faf410ca4569a6da82665b2290ce4e70033d54bc316b952267a012fdf8be8b8b7e5a4eba4636525b2d53fbf37c483337f68fa1

Download Submit
memory/1736-0-0x0000000074F01000-0x0000000074F02000-memory.dmp

Filesize
4KB

Download
memory/1736-1-0x0000000074F00000-0x00000000754AB000-memory.dmp

Filesize
5.7MB

Download
memory/1736-2-0x0000000074F00000-0x00000000754AB000-memory.dmp

Filesize
5.7MB

Download
memory/1736-10-0x0000000074F00000-0x00000000754AB000-memory.dmp

Filesize
5.7MB

Download
memory/2184-11-0x0000000074F00000-0x00000000754AB000-memory.dmp

Filesize
5.7MB

Download
memory/2184-12-0x0000000074F00000-0x00000000754AB000-memory.dmp

Filesize
5.7MB

Download
memory/2184-13-0x0000000074F00000-0x00000000754AB000-memory.dmp

Filesize
5.7MB

Download
memory/2184-23-0x0000000074F00000-0x00000000754AB000-memory.dmp

Filesize
5.7MB

Download