njrat | 4f3b8d1cfa5d84f0eaa63da7af72f0f8d844d2130bdd5324b97d508985bf8748

Analysis

max time kernel
149s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240730-en
resource tags

arch:x64arch:x86image:win10v2004-20240730-enlocale:en-usos:windows10-2004-x64system
submitted
01/08/2024, 01:23

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General

Target
4f3b8d1cfa5d84f0eaa63da7af72f0f8d844d2130bdd5324b97d508985bf8748.exe
Size 298KB
Sample240801-brs96ayejb
SHA256 4f3b8d1cfa5d84f0eaa63da7af72f0f8d844d2130bdd5324b97d508985bf8748
MD5 3621c2d95668ab045e7d618606d699c9
SHA1 2c82b390c927919d8cfe7135d66d76189eac876b
SHA512 e4de1e5d23cd69c61b5f9a83e06cffc42838f7cedde0a44cf0eb7b785c8f8c24dbecf1d7ab317d25bb69072c0f964d84329d3fd79861538d639aa8649c707b86
SSDEEP 3072:GR94Z8d0RYXzNCanWRsxClDaREaA32oBWYbvAHX:GRC4REKiy
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

njrat 复复美制美 discovery evasion persistence privilege_escalation trojan

Malware Config

Extracted

Family

njrat

Version

0.7d

Botnet

复复美制美

hakim32.ddns.net:2000
147.185.221.21:33869

Mutex

5d9b545ac4ee41f57768dba98a8ebbb2

Attributes

reg_key
5d9b545ac4ee41f57768dba98a8ebbb2
splitter
|'|'|

Signatures

njRAT/Bladabindi
Widely used RAT written in .NET.
trojan njrat
Disables Task Manager via registry modification
evasion

Modifies Windows Firewall 2 TTPs 3 IoCs

evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
4072	netsh.exe
1060	netsh.exe
3020	netsh.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-113082768-653872390-2867000172-1000\Control Panel\International\Geo\Nation	4f3b8d1cfa5d84f0eaa63da7af72f0f8d844d2130bdd5324b97d508985bf8748.exe

Drops startup file 6 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\5d9b545ac4ee41f57768dba98a8ebbb2Windows Update.exe	server.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\5d9b545ac4ee41f57768dba98a8ebbb2Windows Update.exe	server.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Explower.exe	server.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Explower.exe	server.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Microsoft Corporation.exe	server.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Microsoft Corporation.exe	server.exe

Executes dropped EXE 3 IoCs

pid	Process
1708	server.exe
1292	StUpdate.exe
4460	StUpdate.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\Explower.exe	server.exe
File opened for modification	C:\Windows\SysWOW64\Explower.exe	server.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Explower.exe	server.exe
File opened for modification	C:\Program Files (x86)\Explower.exe	server.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 9 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 value enumerated	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key queried	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key opened	\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 value enumerated	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key queried	\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

System Location Discovery: System Language Discovery 1 TTPs 8 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	StUpdate.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	4f3b8d1cfa5d84f0eaa63da7af72f0f8d844d2130bdd5324b97d508985bf8748.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	server.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.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	StUpdate.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
2904	schtasks.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1708	server.exe

Suspicious use of AdjustPrivilegeToken 37 IoCs

description	pid	Process
Token: SeDebugPrivilege	1708	server.exe
Token: 33	1708	server.exe
Token: SeIncBasePriorityPrivilege	1708	server.exe
Token: 33	1708	server.exe
Token: SeIncBasePriorityPrivilege	1708	server.exe
Token: 33	1708	server.exe
Token: SeIncBasePriorityPrivilege	1708	server.exe
Token: 33	1708	server.exe
Token: SeIncBasePriorityPrivilege	1708	server.exe
Token: 33	1708	server.exe
Token: SeIncBasePriorityPrivilege	1708	server.exe
Token: 33	1708	server.exe
Token: SeIncBasePriorityPrivilege	1708	server.exe
Token: 33	1708	server.exe
Token: SeIncBasePriorityPrivilege	1708	server.exe
Token: 33	1708	server.exe
Token: SeIncBasePriorityPrivilege	1708	server.exe
Token: 33	1708	server.exe
Token: SeIncBasePriorityPrivilege	1708	server.exe
Token: 33	1708	server.exe
Token: SeIncBasePriorityPrivilege	1708	server.exe
Token: 33	1708	server.exe
Token: SeIncBasePriorityPrivilege	1708	server.exe
Token: 33	1708	server.exe
Token: SeIncBasePriorityPrivilege	1708	server.exe
Token: 33	1708	server.exe
Token: SeIncBasePriorityPrivilege	1708	server.exe
Token: 33	1708	server.exe
Token: SeIncBasePriorityPrivilege	1708	server.exe
Token: 33	1708	server.exe
Token: SeIncBasePriorityPrivilege	1708	server.exe
Token: 33	1708	server.exe
Token: SeIncBasePriorityPrivilege	1708	server.exe
Token: 33	1708	server.exe
Token: SeIncBasePriorityPrivilege	1708	server.exe
Token: 33	1708	server.exe
Token: SeIncBasePriorityPrivilege	1708	server.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3540 wrote to memory of 1708	3540	4f3b8d1cfa5d84f0eaa63da7af72f0f8d844d2130bdd5324b97d508985bf8748.exe	86
PID 3540 wrote to memory of 1708	3540	4f3b8d1cfa5d84f0eaa63da7af72f0f8d844d2130bdd5324b97d508985bf8748.exe	86
PID 3540 wrote to memory of 1708	3540	4f3b8d1cfa5d84f0eaa63da7af72f0f8d844d2130bdd5324b97d508985bf8748.exe	86
PID 1708 wrote to memory of 4072	1708	server.exe	87
PID 1708 wrote to memory of 4072	1708	server.exe	87
PID 1708 wrote to memory of 4072	1708	server.exe	87
PID 1708 wrote to memory of 1060	1708	server.exe	89
PID 1708 wrote to memory of 1060	1708	server.exe	89
PID 1708 wrote to memory of 1060	1708	server.exe	89
PID 1708 wrote to memory of 3020	1708	server.exe	90
PID 1708 wrote to memory of 3020	1708	server.exe	90
PID 1708 wrote to memory of 3020	1708	server.exe	90
PID 1708 wrote to memory of 2904	1708	server.exe	92
PID 1708 wrote to memory of 2904	1708	server.exe	92
PID 1708 wrote to memory of 2904	1708	server.exe	92

C:\Users\Admin\AppData\Local\Temp\4f3b8d1cfa5d84f0eaa63da7af72f0f8d844d2130bdd5324b97d508985bf8748.exe
"C:\Users\Admin\AppData\Local\Temp\4f3b8d1cfa5d84f0eaa63da7af72f0f8d844d2130bdd5324b97d508985bf8748.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3540
- C:\Users\Admin\server.exe
  "C:\Users\Admin\server.exe"
  2⤵
  - Drops startup file
  - Executes dropped EXE
  - Drops file in System32 directory
  - Drops file in Program Files directory
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1708
- - C:\Windows\SysWOW64\netsh.exe
    netsh firewall add allowedprogram "C:\Users\Admin\server.exe" "server.exe" ENABLE
    3⤵
    - Modifies Windows Firewall
    - Event Triggered Execution: Netsh Helper DLL
    - System Location Discovery: System Language Discovery
    PID:4072
- - C:\Windows\SysWOW64\netsh.exe
    netsh firewall delete allowedprogram "C:\Users\Admin\server.exe"
    3⤵
    - Modifies Windows Firewall
    - Event Triggered Execution: Netsh Helper DLL
    - System Location Discovery: System Language Discovery
    PID:1060
- - C:\Windows\SysWOW64\netsh.exe
    netsh firewall add allowedprogram "C:\Users\Admin\server.exe" "server.exe" ENABLE
    3⤵
    - Modifies Windows Firewall
    - Event Triggered Execution: Netsh Helper DLL
    - System Location Discovery: System Language Discovery
    PID:3020
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /sc minute /mo 1 /tn StUpdate /tr C:\Users\Admin\AppData\Local\Temp/StUpdate.exe
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2904

C:\Users\Admin\AppData\Local\Temp\StUpdate.exe
C:\Users\Admin\AppData\Local\Temp/StUpdate.exe
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
PID:1292

C:\Users\Admin\AppData\Local\Temp\StUpdate.exe
C:\Users\Admin\AppData\Local\Temp/StUpdate.exe
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
PID:4460

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Create or Modify System Process

T1543

Windows Service

T1543.003

Event Triggered Execution

T1546

Netsh Helper DLL

T1546.007

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Create or Modify System Process

T1543

Windows Service

T1543.003

Event Triggered Execution

T1546

Netsh Helper DLL

T1546.007

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Impair Defenses

T1562

Disable or Modify System Firewall

T1562.004

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

StUpdate.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\StUpdate.exe.log
Size 507B
SHA256 650faa13e983c9046c9030f63a5fa1c33900432ec7cb3762e015da2e7c5b34a5
MD5 25d1b50e7c0d451f3d850eb54d27ca05
SHA1 a238807715c70a335f54e80d4855644b21a9e870
SHA512 4223a26b2fabefdf1c01443ccc7bd887464d27f02694379895a040c66db472d541218d501f1c01e1bd31012d079a31baf24e20882c32cf652a09a74e3bf385f5
MD5 SHA1 SHA512

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app

Path C:\Users\Admin\AppData\Roaming\app
Size 4B
SHA256 5abdb6175f820f0ac3d8647fbb1f7a0bcc91757a782a8a145570944ca6a00c96
MD5 4d853d9c7197ee7fa81c6535b1f7d655
SHA1 eac3d866e991967b385f3dd22da25e410d8f7f49
SHA512 dc5a09d8586eb9f591f6e00187817c19f693e9328a1b2e5838c61c0b234e9608eecc45bbf7f4a90912e9a456d0ab469ed2503bafb4988b276cec8d5f0b18fda7
MD5 SHA1 SHA512

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server.exe

Path C:\Users\Admin\server.exe
Size 298KB
SHA256 4f3b8d1cfa5d84f0eaa63da7af72f0f8d844d2130bdd5324b97d508985bf8748
MD5 3621c2d95668ab045e7d618606d699c9
SHA1 2c82b390c927919d8cfe7135d66d76189eac876b
SHA512 e4de1e5d23cd69c61b5f9a83e06cffc42838f7cedde0a44cf0eb7b785c8f8c24dbecf1d7ab317d25bb69072c0f964d84329d3fd79861538d639aa8649c707b86
SSDEEP 3072:GR94Z8d0RYXzNCanWRsxClDaREaA32oBWYbvAHX:GRC4REKiy
MD5 SHA1 SHA512 SSDEEP

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memory/1708-55-0x0000000005EB0000-0x0000000005EBA000-memory.dmp

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memory/1708-39-0x0000000074A90000-0x0000000075240000-memory.dmp

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memory/1708-40-0x0000000074A90000-0x0000000075240000-memory.dmp

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memory/1708-66-0x0000000074A90000-0x0000000075240000-memory.dmp

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memory/1708-67-0x0000000074A90000-0x0000000075240000-memory.dmp

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memory/3540-4-0x00000000054F0000-0x0000000005A94000-memory.dmp

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memory/3540-6-0x0000000074A90000-0x0000000075240000-memory.dmp

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memory/3540-5-0x0000000004FE0000-0x0000000005072000-memory.dmp

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memory/3540-3-0x0000000004B00000-0x0000000004B1C000-memory.dmp

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memory/3540-38-0x0000000074A90000-0x0000000075240000-memory.dmp

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memory/3540-2-0x0000000004BA0000-0x0000000004C3C000-memory.dmp

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memory/3540-0-0x0000000074A9E000-0x0000000074A9F000-memory.dmp

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memory/3540-1-0x00000000001B0000-0x0000000000202000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads