njrat | f92ba9ee6557729cd10ecf39309656c92430adbe44b2f8846718fd6c3a7f6b76

General

Target

f92ba9ee6557729cd10ecf39309656c92430adbe44b2f8846718fd6c3a7f6b76.exe
Size

108KB
MD5

3f093d8d048a12f3624fa04a94c4db1c
SHA1

1db63eac595c764dd5c9e8e628c9e62f866e26e5
SHA256

f92ba9ee6557729cd10ecf39309656c92430adbe44b2f8846718fd6c3a7f6b76
SHA512

f5a72fa4dfac83e7a2186a84e445074c656fbba7d35d93cd90c1b5f5e86f731eff64c41289d041193fd62662f5b6f2bbedbd3d6316360f4004a892ba7d237d4d
SSDEEP

1536:6C7bcfsbgxwvFahJKTLKRMp41VPmuvQbDJZp9iXp3qB40qnFT0:d9bgxwdahMLkYmmpblZp9iZv0qn

Score

10^/10

njrat evasion persistence trojan

Malware Config

Signatures

njRAT/Bladabindi
Widely used RAT written in .NET.
trojan njrat
Executes dropped EXE 2 IoCs

Processes:

LocalegrGuJkBCI.execsrss.exe

pid process

2272 LocalegrGuJkBCI.exe
4340 csrss.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

3692 netsh.exe

pid	process
2272	LocalegrGuJkBCI.exe
4340	csrss.exe

pid	process
3692	netsh.exe

Checks computer location settings 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

Processes:

f92ba9ee6557729cd10ecf39309656c92430adbe44b2f8846718fd6c3a7f6b76.exeLocalegrGuJkBCI.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation	f92ba9ee6557729cd10ecf39309656c92430adbe44b2f8846718fd6c3a7f6b76.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation	LocalegrGuJkBCI.exe

Drops startup file 2 IoCs

Processes:

csrss.exe

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\e101a39ab5de59589562aa0ff3295ba5.exe	csrss.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\e101a39ab5de59589562aa0ff3295ba5.exe	csrss.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

csrss.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\e101a39ab5de59589562aa0ff3295ba5 = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\csrss.exe\" .."	csrss.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\e101a39ab5de59589562aa0ff3295ba5 = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\csrss.exe\" .."	csrss.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 30 IoCs

Processes:

csrss.exe

pid	process
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe
4340	csrss.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

csrss.exe

description pid process

Token: SeDebugPrivilege 4340 csrss.exe

description	pid	process
Token: SeDebugPrivilege	4340	csrss.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

f92ba9ee6557729cd10ecf39309656c92430adbe44b2f8846718fd6c3a7f6b76.exeLocalegrGuJkBCI.execsrss.exe

description	pid	process	target process
PID 1628 wrote to memory of 2272	1628	f92ba9ee6557729cd10ecf39309656c92430adbe44b2f8846718fd6c3a7f6b76.exe	LocalegrGuJkBCI.exe
PID 1628 wrote to memory of 2272	1628	f92ba9ee6557729cd10ecf39309656c92430adbe44b2f8846718fd6c3a7f6b76.exe	LocalegrGuJkBCI.exe
PID 1628 wrote to memory of 2272	1628	f92ba9ee6557729cd10ecf39309656c92430adbe44b2f8846718fd6c3a7f6b76.exe	LocalegrGuJkBCI.exe
PID 2272 wrote to memory of 4340	2272	LocalegrGuJkBCI.exe	csrss.exe
PID 2272 wrote to memory of 4340	2272	LocalegrGuJkBCI.exe	csrss.exe
PID 2272 wrote to memory of 4340	2272	LocalegrGuJkBCI.exe	csrss.exe
PID 4340 wrote to memory of 3692	4340	csrss.exe	netsh.exe
PID 4340 wrote to memory of 3692	4340	csrss.exe	netsh.exe
PID 4340 wrote to memory of 3692	4340	csrss.exe	netsh.exe

C:\Users\Admin\AppData\Local\Temp\f92ba9ee6557729cd10ecf39309656c92430adbe44b2f8846718fd6c3a7f6b76.exe
"C:\Users\Admin\AppData\Local\Temp\f92ba9ee6557729cd10ecf39309656c92430adbe44b2f8846718fd6c3a7f6b76.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1628

C:\Users\Admin\AppData\LocalegrGuJkBCI.exe
"C:\Users\Admin\AppData\LocalegrGuJkBCI.exe"
2⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2272

C:\Users\Admin\AppData\Local\Temp\csrss.exe
"C:\Users\Admin\AppData\Local\Temp\csrss.exe"
3⤵
- Executes dropped EXE
- Drops startup file
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4340

C:\Windows\SysWOW64\netsh.exe
netsh firewall add allowedprogram "C:\Users\Admin\AppData\Local\Temp\csrss.exe" "csrss.exe" ENABLE
4⤵
- Modifies Windows Firewall
PID:3692

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Modify Existing Service

1

T1031

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\csrss.exe
Filesize
27KB

MD5
75f46d846f14b5561b0dc0078c431530

SHA1
23ef45b0545b335afb4e2055fea3aa8f1a17987b

SHA256
7458c62c04b5712256370a2683e0607fab8249e558681061d12fe10b03b643bb

SHA512
22488cf286c9bb74163ee725ccce37b2f4136ed8a1197b3b629bd5542e36721d4499874f0d1bc4ab107fdba50f4c05a03bc40268f748a0be6c43d9379914a2de

Download Submit
C:\Users\Admin\AppData\Local\Temp\csrss.exe
Filesize
27KB

MD5
75f46d846f14b5561b0dc0078c431530

SHA1
23ef45b0545b335afb4e2055fea3aa8f1a17987b

SHA256
7458c62c04b5712256370a2683e0607fab8249e558681061d12fe10b03b643bb

SHA512
22488cf286c9bb74163ee725ccce37b2f4136ed8a1197b3b629bd5542e36721d4499874f0d1bc4ab107fdba50f4c05a03bc40268f748a0be6c43d9379914a2de

Download Submit
C:\Users\Admin\AppData\LocalegrGuJkBCI.exe
Filesize
27KB

MD5
75f46d846f14b5561b0dc0078c431530

SHA1
23ef45b0545b335afb4e2055fea3aa8f1a17987b

SHA256
7458c62c04b5712256370a2683e0607fab8249e558681061d12fe10b03b643bb

SHA512
22488cf286c9bb74163ee725ccce37b2f4136ed8a1197b3b629bd5542e36721d4499874f0d1bc4ab107fdba50f4c05a03bc40268f748a0be6c43d9379914a2de

Download Submit
C:\Users\Admin\AppData\LocalegrGuJkBCI.exe
Filesize
27KB

MD5
75f46d846f14b5561b0dc0078c431530

SHA1
23ef45b0545b335afb4e2055fea3aa8f1a17987b

SHA256
7458c62c04b5712256370a2683e0607fab8249e558681061d12fe10b03b643bb

SHA512
22488cf286c9bb74163ee725ccce37b2f4136ed8a1197b3b629bd5542e36721d4499874f0d1bc4ab107fdba50f4c05a03bc40268f748a0be6c43d9379914a2de

Download Submit
memory/1628-132-0x00007FFA10690000-0x00007FFA110C6000-memory.dmp

Filesize
10.2MB

Download
memory/2272-133-0x0000000000000000-mapping.dmp

Download
memory/2272-136-0x0000000074DF0000-0x00000000753A1000-memory.dmp

Filesize
5.7MB

Download
memory/2272-141-0x0000000074DF0000-0x00000000753A1000-memory.dmp

Filesize
5.7MB

Download
memory/3692-140-0x0000000000000000-mapping.dmp

Download
memory/4340-137-0x0000000000000000-mapping.dmp

Download
memory/4340-142-0x0000000074DF0000-0x00000000753A1000-memory.dmp

Filesize
5.7MB

Download
memory/4340-143-0x0000000074DF0000-0x00000000753A1000-memory.dmp

Filesize
5.7MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads