Analysis
-
max time kernel
150s -
max time network
143s -
platform
windows10_x64 -
resource
win10v20201028 -
submitted
02-01-2021 17:33
Static task
static1
Behavioral task
behavioral1
Sample
sD4Q5TaU.exe
Resource
win7v20201028
Behavioral task
behavioral2
Sample
sD4Q5TaU.exe
Resource
win10v20201028
General
-
Target
sD4Q5TaU.exe
-
Size
23KB
-
MD5
c6666ce354062eaa6b64b7e67daa2968
-
SHA1
40982aa18aa268abf9d61e544563841ff86cbf38
-
SHA256
0cd1428ac5c9ef16fdc50458faac098457e93027f54eb011d04b74b944f67f67
-
SHA512
b4cc5a6aa3f56b71bce993ab78ce82eaffd4aa40347672d0a019a1ea40e72bcdba2fedf79a8ee750e9de1c5452f8a6f429c4a2f186075c7710df8e5d1f98eb70
Malware Config
Extracted
njrat
Blue
AntiBot
anti.kro.kr:7
bd8a83ed8b02d3c995a02f159f9c2953
-
reg_key
bd8a83ed8b02d3c995a02f159f9c2953
-
splitter
|'|'|
Signatures
-
Executes dropped EXE 1 IoCs
Processes:
csrss.exepid process 2976 csrss.exe -
Modifies Windows Firewall 1 TTPs
-
Drops startup file 2 IoCs
Processes:
csrss.exedescription ioc process File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\bd8a83ed8b02d3c995a02f159f9c2953.exe csrss.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\bd8a83ed8b02d3c995a02f159f9c2953.exe csrss.exe -
Adds Run key to start application 2 TTPs 2 IoCs
Processes:
csrss.exedescription ioc process Set value (str) \REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run\bd8a83ed8b02d3c995a02f159f9c2953 = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\csrss.exe\" .." csrss.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\bd8a83ed8b02d3c995a02f159f9c2953 = "\"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.
-
Suspicious use of AdjustPrivilegeToken 33 IoCs
Processes:
csrss.exedescription pid process Token: SeDebugPrivilege 2976 csrss.exe Token: 33 2976 csrss.exe Token: SeIncBasePriorityPrivilege 2976 csrss.exe Token: 33 2976 csrss.exe Token: SeIncBasePriorityPrivilege 2976 csrss.exe Token: 33 2976 csrss.exe Token: SeIncBasePriorityPrivilege 2976 csrss.exe Token: 33 2976 csrss.exe Token: SeIncBasePriorityPrivilege 2976 csrss.exe Token: 33 2976 csrss.exe Token: SeIncBasePriorityPrivilege 2976 csrss.exe Token: 33 2976 csrss.exe Token: SeIncBasePriorityPrivilege 2976 csrss.exe Token: 33 2976 csrss.exe Token: SeIncBasePriorityPrivilege 2976 csrss.exe Token: 33 2976 csrss.exe Token: SeIncBasePriorityPrivilege 2976 csrss.exe Token: 33 2976 csrss.exe Token: SeIncBasePriorityPrivilege 2976 csrss.exe Token: 33 2976 csrss.exe Token: SeIncBasePriorityPrivilege 2976 csrss.exe Token: 33 2976 csrss.exe Token: SeIncBasePriorityPrivilege 2976 csrss.exe Token: 33 2976 csrss.exe Token: SeIncBasePriorityPrivilege 2976 csrss.exe Token: 33 2976 csrss.exe Token: SeIncBasePriorityPrivilege 2976 csrss.exe Token: 33 2976 csrss.exe Token: SeIncBasePriorityPrivilege 2976 csrss.exe Token: 33 2976 csrss.exe Token: SeIncBasePriorityPrivilege 2976 csrss.exe Token: 33 2976 csrss.exe Token: SeIncBasePriorityPrivilege 2976 csrss.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
sD4Q5TaU.execsrss.exedescription pid process target process PID 2484 wrote to memory of 2976 2484 sD4Q5TaU.exe csrss.exe PID 2484 wrote to memory of 2976 2484 sD4Q5TaU.exe csrss.exe PID 2484 wrote to memory of 2976 2484 sD4Q5TaU.exe csrss.exe PID 2976 wrote to memory of 184 2976 csrss.exe netsh.exe PID 2976 wrote to memory of 184 2976 csrss.exe netsh.exe PID 2976 wrote to memory of 184 2976 csrss.exe netsh.exe
Processes
-
C:\Users\Admin\AppData\Local\Temp\sD4Q5TaU.exe"C:\Users\Admin\AppData\Local\Temp\sD4Q5TaU.exe"1⤵
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\Temp\csrss.exe"C:\Users\Admin\AppData\Local\Temp\csrss.exe"2⤵
- Executes dropped EXE
- Drops startup file
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\netsh.exenetsh firewall add allowedprogram "C:\Users\Admin\AppData\Local\Temp\csrss.exe" "csrss.exe" ENABLE3⤵
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
Loading Replay Monitor...
Downloads
-
C:\Users\Admin\AppData\Local\Temp\csrss.exeMD5
c6666ce354062eaa6b64b7e67daa2968
SHA140982aa18aa268abf9d61e544563841ff86cbf38
SHA2560cd1428ac5c9ef16fdc50458faac098457e93027f54eb011d04b74b944f67f67
SHA512b4cc5a6aa3f56b71bce993ab78ce82eaffd4aa40347672d0a019a1ea40e72bcdba2fedf79a8ee750e9de1c5452f8a6f429c4a2f186075c7710df8e5d1f98eb70
-
C:\Users\Admin\AppData\Local\Temp\csrss.exeMD5
c6666ce354062eaa6b64b7e67daa2968
SHA140982aa18aa268abf9d61e544563841ff86cbf38
SHA2560cd1428ac5c9ef16fdc50458faac098457e93027f54eb011d04b74b944f67f67
SHA512b4cc5a6aa3f56b71bce993ab78ce82eaffd4aa40347672d0a019a1ea40e72bcdba2fedf79a8ee750e9de1c5452f8a6f429c4a2f186075c7710df8e5d1f98eb70
-
memory/184-5-0x0000000000000000-mapping.dmp
-
memory/2976-2-0x0000000000000000-mapping.dmp