njrat | 355cc4d01ff4e1e7823a5f9309d132e156bbaccfd132843ff6b16c1a51e4e808

Analysis

max time kernel
150s
max time network
139s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
28-12-2024 17:08

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General

Target

fixer.exe
Size

37KB
MD5

c7696b58deb5e95c507a043bf12be20a
SHA1

2e78f7d8c1b0d55f0a089b6f9c283a2ed1de7296
SHA256

355cc4d01ff4e1e7823a5f9309d132e156bbaccfd132843ff6b16c1a51e4e808
SHA512

714d7489a045e01657e3914f565e3459915276fe2cb80fd13f448eedf2b919bec0e6fe2c49e882954da8601e93cff93ff79a33a0771870e86e7c5e36d6d5078a
SSDEEP

384:d2IAJqDKicFD25Rg5Iy1vJAJ/xzaYa6NwlrAF+rMRTyN/0L+EcoinblneHQM3epQ:IIAGE5j1vJAJVal6mlrM+rMRa8Nunyt

Score

10^/10

njrat boykisser discovery evasion persistence privilege_escalation trojan

Malware Config

Extracted

Family

njrat

Version

im523

Botnet

boykisser

issues-religion.gl.at.ply.gg:24271

Mutex

974d0e73d45f67eaec053d9149fad58b

Attributes

reg_key
974d0e73d45f67eaec053d9149fad58b
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
2752	netsh.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\974d0e73d45f67eaec053d9149fad58b.exe	COM Surrogate.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\974d0e73d45f67eaec053d9149fad58b.exe	COM Surrogate.exe

Executes dropped EXE 1 IoCs

pid	Process
2324	COM Surrogate.exe

Loads dropped DLL 1 IoCs

pid	Process
1920	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-1-5-21-312935884-697965778-3955649944-1000\Software\Microsoft\Windows\CurrentVersion\Run\974d0e73d45f67eaec053d9149fad58b = "\"C:\\ProgramData\\COM Surrogate.exe\" .."	COM Surrogate.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\974d0e73d45f67eaec053d9149fad58b = "\"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	fixer.exe
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

Kills process with taskkill 1 IoCs

evasion

pid	Process
2828	taskkill.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe
2324	COM Surrogate.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2324	COM Surrogate.exe

Suspicious use of AdjustPrivilegeToken 36 IoCs

description	pid	Process
Token: SeDebugPrivilege	2324	COM Surrogate.exe
Token: SeDebugPrivilege	2828	taskkill.exe
Token: 33	2324	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2324	COM Surrogate.exe
Token: 33	2324	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2324	COM Surrogate.exe
Token: 33	2324	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2324	COM Surrogate.exe
Token: 33	2324	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2324	COM Surrogate.exe
Token: 33	2324	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2324	COM Surrogate.exe
Token: 33	2324	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2324	COM Surrogate.exe
Token: 33	2324	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2324	COM Surrogate.exe
Token: 33	2324	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2324	COM Surrogate.exe
Token: 33	2324	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2324	COM Surrogate.exe
Token: 33	2324	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2324	COM Surrogate.exe
Token: 33	2324	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2324	COM Surrogate.exe
Token: 33	2324	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2324	COM Surrogate.exe
Token: 33	2324	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2324	COM Surrogate.exe
Token: 33	2324	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2324	COM Surrogate.exe
Token: 33	2324	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2324	COM Surrogate.exe
Token: 33	2324	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2324	COM Surrogate.exe
Token: 33	2324	COM Surrogate.exe
Token: SeIncBasePriorityPrivilege	2324	COM Surrogate.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 1920 wrote to memory of 2324	1920	fixer.exe	30
PID 1920 wrote to memory of 2324	1920	fixer.exe	30
PID 1920 wrote to memory of 2324	1920	fixer.exe	30
PID 1920 wrote to memory of 2324	1920	fixer.exe	30
PID 2324 wrote to memory of 2752	2324	COM Surrogate.exe	31
PID 2324 wrote to memory of 2752	2324	COM Surrogate.exe	31
PID 2324 wrote to memory of 2752	2324	COM Surrogate.exe	31
PID 2324 wrote to memory of 2752	2324	COM Surrogate.exe	31
PID 2324 wrote to memory of 2828	2324	COM Surrogate.exe	33
PID 2324 wrote to memory of 2828	2324	COM Surrogate.exe	33
PID 2324 wrote to memory of 2828	2324	COM Surrogate.exe	33
PID 2324 wrote to memory of 2828	2324	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:1920
- 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:2324
- - 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:2752
- - 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:2828

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
c7696b58deb5e95c507a043bf12be20a

SHA1
2e78f7d8c1b0d55f0a089b6f9c283a2ed1de7296

SHA256
355cc4d01ff4e1e7823a5f9309d132e156bbaccfd132843ff6b16c1a51e4e808

SHA512
714d7489a045e01657e3914f565e3459915276fe2cb80fd13f448eedf2b919bec0e6fe2c49e882954da8601e93cff93ff79a33a0771870e86e7c5e36d6d5078a

Download Submit
memory/1920-0-0x0000000074DA1000-0x0000000074DA2000-memory.dmp

Filesize
4KB

Download
memory/1920-1-0x0000000074DA0000-0x000000007534B000-memory.dmp

Filesize
5.7MB

Download
memory/1920-2-0x0000000074DA0000-0x000000007534B000-memory.dmp

Filesize
5.7MB

Download
memory/1920-11-0x0000000074DA0000-0x000000007534B000-memory.dmp

Filesize
5.7MB

Download
memory/2324-10-0x0000000074DA0000-0x000000007534B000-memory.dmp

Filesize
5.7MB

Download
memory/2324-12-0x0000000074DA0000-0x000000007534B000-memory.dmp

Filesize
5.7MB

Download
memory/2324-22-0x0000000074DA0000-0x000000007534B000-memory.dmp

Filesize
5.7MB

Download