njrat | 10b39a7b4cc868c0bb82b9c379dacca3128a3d895534ceb3f4530254283df714

Analysis

max time kernel
159s
max time network
166s
platform
windows10-2004_x64
resource
win10v2004-20220414-en
submitted
20-05-2022 21:27

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General

Target

10b39a7b4cc868c0bb82b9c379dacca3128a3d895534ceb3f4530254283df714.exe
Size

93KB
MD5

11c813cb79e7eea0425a08f23310f453
SHA1

d28dda7daf5adbaef897dfd64777d2fcc828dd39
SHA256

10b39a7b4cc868c0bb82b9c379dacca3128a3d895534ceb3f4530254283df714
SHA512

99f686f50aceb451317083cae0f628297c0723af77209de65688240634b35be2b4651f11cb7e496939a6d39f885d97c3d6dde437715a3adbea0df2ee92705f00

Score

10^/10

njrat system32 evasion trojan

Malware Config

Extracted

Family

njrat

Version

0.7d

Botnet

system32

FRANSESCOC50Y3Aubmdyb2suaW8Strik:MTU3NDU=

Mutex

6c3e5ffb4e89d90516803c294c8c707b

Attributes

reg_key
6c3e5ffb4e89d90516803c294c8c707b
splitter
|'|'|

Signatures

njRAT/Bladabindi
Widely used RAT written in .NET.
trojan njrat
Executes dropped EXE 4 IoCs

Processes:

server.exeStUpdate.exeStUpdate.exeStUpdate.exe

pid process

392 server.exe
1204 StUpdate.exe
4004 StUpdate.exe
3128 StUpdate.exe
Modifies Windows Firewall 1 TTPs
evasion

Modify Existing Service
T1031

pid	process
392	server.exe
1204	StUpdate.exe
4004	StUpdate.exe
3128	StUpdate.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

Processes:

10b39a7b4cc868c0bb82b9c379dacca3128a3d895534ceb3f4530254283df714.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\Control Panel\International\Geo\Nation	10b39a7b4cc868c0bb82b9c379dacca3128a3d895534ceb3f4530254283df714.exe

Drops startup file 6 IoCs

Processes:

server.exe

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\6c3e5ffb4e89d90516803c294c8c707bWindows Update.exe	server.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\6c3e5ffb4e89d90516803c294c8c707bWindows 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

Drops file in System32 directory 2 IoCs

Processes:

server.exe

description ioc process

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

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

Processes:

server.exe

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). Likely ransomware behaviour.

System Information Discovery
T1082
Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task
T1053

Processes:

schtasks.exe

pid process

2812 schtasks.exe
Modifies registry class 1 IoCs

Processes:

server.exe

description ioc process

Key created \REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000_Classes\Local Settings server.exe
Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

server.exe

pid process

392 server.exe

pid	process
2812	schtasks.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000_Classes\Local Settings	server.exe

pid	process
392	server.exe

Suspicious use of AdjustPrivilegeToken 37 IoCs

Processes:

server.exe

description	pid	process
Token: SeDebugPrivilege	392	server.exe
Token: 33	392	server.exe
Token: SeIncBasePriorityPrivilege	392	server.exe
Token: 33	392	server.exe
Token: SeIncBasePriorityPrivilege	392	server.exe
Token: 33	392	server.exe
Token: SeIncBasePriorityPrivilege	392	server.exe
Token: 33	392	server.exe
Token: SeIncBasePriorityPrivilege	392	server.exe
Token: 33	392	server.exe
Token: SeIncBasePriorityPrivilege	392	server.exe
Token: 33	392	server.exe
Token: SeIncBasePriorityPrivilege	392	server.exe
Token: 33	392	server.exe
Token: SeIncBasePriorityPrivilege	392	server.exe
Token: 33	392	server.exe
Token: SeIncBasePriorityPrivilege	392	server.exe
Token: 33	392	server.exe
Token: SeIncBasePriorityPrivilege	392	server.exe
Token: 33	392	server.exe
Token: SeIncBasePriorityPrivilege	392	server.exe
Token: 33	392	server.exe
Token: SeIncBasePriorityPrivilege	392	server.exe
Token: 33	392	server.exe
Token: SeIncBasePriorityPrivilege	392	server.exe
Token: 33	392	server.exe
Token: SeIncBasePriorityPrivilege	392	server.exe
Token: 33	392	server.exe
Token: SeIncBasePriorityPrivilege	392	server.exe
Token: 33	392	server.exe
Token: SeIncBasePriorityPrivilege	392	server.exe
Token: 33	392	server.exe
Token: SeIncBasePriorityPrivilege	392	server.exe
Token: 33	392	server.exe
Token: SeIncBasePriorityPrivilege	392	server.exe
Token: 33	392	server.exe
Token: SeIncBasePriorityPrivilege	392	server.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

10b39a7b4cc868c0bb82b9c379dacca3128a3d895534ceb3f4530254283df714.exeserver.exe

description	pid	process	target process
PID 2888 wrote to memory of 392	2888	10b39a7b4cc868c0bb82b9c379dacca3128a3d895534ceb3f4530254283df714.exe	server.exe
PID 2888 wrote to memory of 392	2888	10b39a7b4cc868c0bb82b9c379dacca3128a3d895534ceb3f4530254283df714.exe	server.exe
PID 2888 wrote to memory of 392	2888	10b39a7b4cc868c0bb82b9c379dacca3128a3d895534ceb3f4530254283df714.exe	server.exe
PID 392 wrote to memory of 2108	392	server.exe	netsh.exe
PID 392 wrote to memory of 2108	392	server.exe	netsh.exe
PID 392 wrote to memory of 2108	392	server.exe	netsh.exe
PID 392 wrote to memory of 2812	392	server.exe	schtasks.exe
PID 392 wrote to memory of 2812	392	server.exe	schtasks.exe
PID 392 wrote to memory of 2812	392	server.exe	schtasks.exe

C:\Users\Admin\AppData\Local\Temp\10b39a7b4cc868c0bb82b9c379dacca3128a3d895534ceb3f4530254283df714.exe
"C:\Users\Admin\AppData\Local\Temp\10b39a7b4cc868c0bb82b9c379dacca3128a3d895534ceb3f4530254283df714.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2888

C:\Users\Admin\AppData\Local\Temp\server.exe
"C:\Users\Admin\AppData\Local\Temp\server.exe"
2⤵
- Executes dropped EXE
- Drops startup file
- Drops file in System32 directory
- Drops file in Program Files directory
- Modifies registry class
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:392

C:\Windows\SysWOW64\netsh.exe
netsh firewall add allowedprogram "C:\Users\Admin\AppData\Local\Temp\server.exe" "server.exe" ENABLE
3⤵
PID:2108

C:\Windows\SysWOW64\schtasks.exe
schtasks /create /sc minute /mo 1 /tn StUpdate /tr C:\Users\Admin\AppData\Local\Temp/StUpdate.exe
3⤵
- Creates scheduled task(s)
PID:2812

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:3160

C:\Users\Admin\AppData\Local\Temp\StUpdate.exe
C:\Users\Admin\AppData\Local\Temp/StUpdate.exe
1⤵
- Executes dropped EXE
PID:1204

C:\Users\Admin\AppData\Local\Temp\StUpdate.exe
C:\Users\Admin\AppData\Local\Temp/StUpdate.exe
1⤵
- Executes dropped EXE
PID:4004

C:\Users\Admin\AppData\Local\Temp\StUpdate.exe
C:\Users\Admin\AppData\Local\Temp/StUpdate.exe
1⤵
- Executes dropped EXE
PID:3128

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Modify Existing Service

T1031

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v2.0_32\UsageLogs\StUpdate.exe.log

Filesize
408B

MD5
661cab77d3b907e8057f2e689e995af3

SHA1
5d1a0ee9c5ee7a7a90d56d00c10dc0e679bee01c

SHA256
8f27f95ad7c09f2e05d7960e78ef8cd935c1262e9657883a75d70dcb877592d2

SHA512
2523b316bd79fed0e9b3d73f46959f3dfe270cf950f34bd9d49fe4113a2ae46d0cd00224d848bc40c0d8c55449e2dccc4b4278ba4809c0ca9ede1ac75673fc67

Download Submit
C:\Users\Admin\AppData\Local\Temp\StUpdate.exe

Filesize
93KB

MD5
11c813cb79e7eea0425a08f23310f453

SHA1
d28dda7daf5adbaef897dfd64777d2fcc828dd39

SHA256
10b39a7b4cc868c0bb82b9c379dacca3128a3d895534ceb3f4530254283df714

SHA512
99f686f50aceb451317083cae0f628297c0723af77209de65688240634b35be2b4651f11cb7e496939a6d39f885d97c3d6dde437715a3adbea0df2ee92705f00

Download Submit
C:\Users\Admin\AppData\Local\Temp\StUpdate.exe

Filesize
93KB

MD5
11c813cb79e7eea0425a08f23310f453

SHA1
d28dda7daf5adbaef897dfd64777d2fcc828dd39

SHA256
10b39a7b4cc868c0bb82b9c379dacca3128a3d895534ceb3f4530254283df714

SHA512
99f686f50aceb451317083cae0f628297c0723af77209de65688240634b35be2b4651f11cb7e496939a6d39f885d97c3d6dde437715a3adbea0df2ee92705f00

Download Submit
C:\Users\Admin\AppData\Local\Temp\StUpdate.exe

Filesize
93KB

MD5
11c813cb79e7eea0425a08f23310f453

SHA1
d28dda7daf5adbaef897dfd64777d2fcc828dd39

SHA256
10b39a7b4cc868c0bb82b9c379dacca3128a3d895534ceb3f4530254283df714

SHA512
99f686f50aceb451317083cae0f628297c0723af77209de65688240634b35be2b4651f11cb7e496939a6d39f885d97c3d6dde437715a3adbea0df2ee92705f00

Download Submit
C:\Users\Admin\AppData\Local\Temp\StUpdate.exe

Filesize
93KB

MD5
11c813cb79e7eea0425a08f23310f453

SHA1
d28dda7daf5adbaef897dfd64777d2fcc828dd39

SHA256
10b39a7b4cc868c0bb82b9c379dacca3128a3d895534ceb3f4530254283df714

SHA512
99f686f50aceb451317083cae0f628297c0723af77209de65688240634b35be2b4651f11cb7e496939a6d39f885d97c3d6dde437715a3adbea0df2ee92705f00

Download Submit
C:\Users\Admin\AppData\Local\Temp\server.exe

Filesize
93KB

MD5
11c813cb79e7eea0425a08f23310f453

SHA1
d28dda7daf5adbaef897dfd64777d2fcc828dd39

SHA256
10b39a7b4cc868c0bb82b9c379dacca3128a3d895534ceb3f4530254283df714

SHA512
99f686f50aceb451317083cae0f628297c0723af77209de65688240634b35be2b4651f11cb7e496939a6d39f885d97c3d6dde437715a3adbea0df2ee92705f00

Download Submit
C:\Users\Admin\AppData\Local\Temp\server.exe

Filesize
93KB

MD5
11c813cb79e7eea0425a08f23310f453

SHA1
d28dda7daf5adbaef897dfd64777d2fcc828dd39

SHA256
10b39a7b4cc868c0bb82b9c379dacca3128a3d895534ceb3f4530254283df714

SHA512
99f686f50aceb451317083cae0f628297c0723af77209de65688240634b35be2b4651f11cb7e496939a6d39f885d97c3d6dde437715a3adbea0df2ee92705f00

Download Submit
C:\Users\Admin\AppData\Roaming\app

Filesize
5B

MD5
53ce6d1ae8885b5d12e654469f456c83

SHA1
9d8b30c523ddef4d24134072b27716bec7d94d6f

SHA256
d7ebf92ad6e3bc44fbc3cfbb234ef4afafd7ea339f712229641a2849b6f87ce2

SHA512
c15df9281e9ccbb8d30e24e751b77a030e734f8cda4bd9482d3ca02f6b23e463a8e90ddd78a582ca059e57b8d0492c22583d792bc7368094ffc06e12cd145d9d

Download Submit
C:\Users\Admin\AppData\Roaming\app

Filesize
5B

MD5
53ce6d1ae8885b5d12e654469f456c83

SHA1
9d8b30c523ddef4d24134072b27716bec7d94d6f

SHA256
d7ebf92ad6e3bc44fbc3cfbb234ef4afafd7ea339f712229641a2849b6f87ce2

SHA512
c15df9281e9ccbb8d30e24e751b77a030e734f8cda4bd9482d3ca02f6b23e463a8e90ddd78a582ca059e57b8d0492c22583d792bc7368094ffc06e12cd145d9d

Download Submit
C:\Users\Admin\AppData\Roaming\app

Filesize
5B

MD5
53ce6d1ae8885b5d12e654469f456c83

SHA1
9d8b30c523ddef4d24134072b27716bec7d94d6f

SHA256
d7ebf92ad6e3bc44fbc3cfbb234ef4afafd7ea339f712229641a2849b6f87ce2

SHA512
c15df9281e9ccbb8d30e24e751b77a030e734f8cda4bd9482d3ca02f6b23e463a8e90ddd78a582ca059e57b8d0492c22583d792bc7368094ffc06e12cd145d9d

Download Submit
C:\Users\Admin\AppData\Roaming\app

Filesize
5B

MD5
53ce6d1ae8885b5d12e654469f456c83

SHA1
9d8b30c523ddef4d24134072b27716bec7d94d6f

SHA256
d7ebf92ad6e3bc44fbc3cfbb234ef4afafd7ea339f712229641a2849b6f87ce2

SHA512
c15df9281e9ccbb8d30e24e751b77a030e734f8cda4bd9482d3ca02f6b23e463a8e90ddd78a582ca059e57b8d0492c22583d792bc7368094ffc06e12cd145d9d

Download Submit
memory/392-131-0x0000000000000000-mapping.dmp

Download
memory/392-135-0x00000000748F0000-0x0000000074EA1000-memory.dmp

Filesize
5.7MB

Download
memory/1204-141-0x00000000748F0000-0x0000000074EA1000-memory.dmp

Filesize
5.7MB

Download
memory/2108-136-0x0000000000000000-mapping.dmp

Download
memory/2812-137-0x0000000000000000-mapping.dmp

Download
memory/2888-130-0x00000000748F0000-0x0000000074EA1000-memory.dmp

Filesize
5.7MB

Download
memory/3128-148-0x00000000748F0000-0x0000000074EA1000-memory.dmp

Filesize
5.7MB

Download
memory/4004-145-0x00000000748F0000-0x0000000074EA1000-memory.dmp

Filesize
5.7MB

Download