njrat | 4f3b8d1cfa5d84f0eaa63da7af72f0f8d844d2130bdd5324b97d508985bf8748

Analysis

max time kernel
148s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20240730-en
resource tags

arch:x64arch:x86image:win10v2004-20240730-enlocale:en-usos:windows10-2004-x64system
submitted
31/07/2024, 04:41

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General

Target
3621c2d95668ab045e7d618606d699c9.exe
Size 298KB
Sample240731-fa4f1s1elf
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
2452	netsh.exe
1488	netsh.exe
4904	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-1-5-21-195445723-368091294-1661186673-1000\Control Panel\International\Geo\Nation	3621c2d95668ab045e7d618606d699c9.exe

Drops startup file 6 IoCs

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

Executes dropped EXE 3 IoCs

pid	Process
2172	server.exe
4964	StUpdate.exe
5100	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 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 value enumerated	\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
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

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	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	StUpdate.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	StUpdate.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	3621c2d95668ab045e7d618606d699c9.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

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
1540	schtasks.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2172	server.exe

Suspicious use of AdjustPrivilegeToken 37 IoCs

description	pid	Process
Token: SeDebugPrivilege	2172	server.exe
Token: 33	2172	server.exe
Token: SeIncBasePriorityPrivilege	2172	server.exe
Token: 33	2172	server.exe
Token: SeIncBasePriorityPrivilege	2172	server.exe
Token: 33	2172	server.exe
Token: SeIncBasePriorityPrivilege	2172	server.exe
Token: 33	2172	server.exe
Token: SeIncBasePriorityPrivilege	2172	server.exe
Token: 33	2172	server.exe
Token: SeIncBasePriorityPrivilege	2172	server.exe
Token: 33	2172	server.exe
Token: SeIncBasePriorityPrivilege	2172	server.exe
Token: 33	2172	server.exe
Token: SeIncBasePriorityPrivilege	2172	server.exe
Token: 33	2172	server.exe
Token: SeIncBasePriorityPrivilege	2172	server.exe
Token: 33	2172	server.exe
Token: SeIncBasePriorityPrivilege	2172	server.exe
Token: 33	2172	server.exe
Token: SeIncBasePriorityPrivilege	2172	server.exe
Token: 33	2172	server.exe
Token: SeIncBasePriorityPrivilege	2172	server.exe
Token: 33	2172	server.exe
Token: SeIncBasePriorityPrivilege	2172	server.exe
Token: 33	2172	server.exe
Token: SeIncBasePriorityPrivilege	2172	server.exe
Token: 33	2172	server.exe
Token: SeIncBasePriorityPrivilege	2172	server.exe
Token: 33	2172	server.exe
Token: SeIncBasePriorityPrivilege	2172	server.exe
Token: 33	2172	server.exe
Token: SeIncBasePriorityPrivilege	2172	server.exe
Token: 33	2172	server.exe
Token: SeIncBasePriorityPrivilege	2172	server.exe
Token: 33	2172	server.exe
Token: SeIncBasePriorityPrivilege	2172	server.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4356 wrote to memory of 2172	4356	3621c2d95668ab045e7d618606d699c9.exe	85
PID 4356 wrote to memory of 2172	4356	3621c2d95668ab045e7d618606d699c9.exe	85
PID 4356 wrote to memory of 2172	4356	3621c2d95668ab045e7d618606d699c9.exe	85
PID 2172 wrote to memory of 2452	2172	server.exe	86
PID 2172 wrote to memory of 2452	2172	server.exe	86
PID 2172 wrote to memory of 2452	2172	server.exe	86
PID 2172 wrote to memory of 1488	2172	server.exe	88
PID 2172 wrote to memory of 1488	2172	server.exe	88
PID 2172 wrote to memory of 1488	2172	server.exe	88
PID 2172 wrote to memory of 4904	2172	server.exe	89
PID 2172 wrote to memory of 4904	2172	server.exe	89
PID 2172 wrote to memory of 4904	2172	server.exe	89
PID 2172 wrote to memory of 1540	2172	server.exe	91
PID 2172 wrote to memory of 1540	2172	server.exe	91
PID 2172 wrote to memory of 1540	2172	server.exe	91

C:\Users\Admin\AppData\Local\Temp\3621c2d95668ab045e7d618606d699c9.exe
"C:\Users\Admin\AppData\Local\Temp\3621c2d95668ab045e7d618606d699c9.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4356
- 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:2172
- - 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:2452
- - 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:1488
- - 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:4904
- - 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:1540

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:4964

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:5100

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 5B
SHA256 59f6eeca3c022531b409b0dc1ea7c1d244ecc7af5b67a5600470b59cdbc04abe
MD5 850ad04adc35f6ec7809f0f70de8300c
SHA1 06387beffabdf4ea012664a1d2693862a5e5a181
SHA512 fca8d80dcdc3a14a04e5ae665dfae9c7b915d4b52b6a24b271d4ad67d9c72c2485815dcb097721d952458857eda8c0edac23f997486a3a1936693b1a5bb35532
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/2172-39-0x00000000747A0000-0x0000000074F50000-memory.dmp

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memory/2172-67-0x00000000747A0000-0x0000000074F50000-memory.dmp

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memory/2172-66-0x00000000747A0000-0x0000000074F50000-memory.dmp

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memory/2172-55-0x00000000053E0000-0x00000000053EA000-memory.dmp

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memory/2172-40-0x00000000747A0000-0x0000000074F50000-memory.dmp

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memory/4356-4-0x0000000005550000-0x0000000005AF4000-memory.dmp

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memory/4356-38-0x00000000747A0000-0x0000000074F50000-memory.dmp

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memory/4356-5-0x0000000004FA0000-0x0000000005032000-memory.dmp

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memory/4356-6-0x00000000747A0000-0x0000000074F50000-memory.dmp

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memory/4356-0-0x00000000747AE000-0x00000000747AF000-memory.dmp

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memory/4356-3-0x00000000024A0000-0x00000000024BC000-memory.dmp

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memory/4356-2-0x0000000004C20000-0x0000000004CBC000-memory.dmp

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memory/4356-1-0x0000000000160000-0x00000000001B2000-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