njrat | 8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372

General

Target

8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372.exe
Size

38KB
MD5

80669037be14749384c364424db64fd0
SHA1

df7d67cff05d6b905660c70907187f87cad411d5
SHA256

8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372
SHA512

681cefdac862bd33ba016ae317c92841758c85a13d6a987191e69ab24a700ca501222f87e36a4b277fd736df88b068675f1a98b1c51a28ff5261144149bc8394
SSDEEP

768:uFDKZIRxEAo/Lifrz/YaqeUNNqifW5ROj10Au4pc24yjhxl:uxqmfv/Y/tqifW/Oj10Wc2RVr

Score

10^/10

njrat evasion persistence trojan

Malware Config

Signatures

njRAT/Bladabindi
Widely used RAT written in .NET.
trojan njrat

Executes dropped EXE 1 IoCs

pid	Process
2376	crss.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
4720	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-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\f5101deccaff383a92d229a66cb9c194.exe	crss.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\f5101deccaff383a92d229a66cb9c194.exe	crss.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\f5101deccaff383a92d229a66cb9c194 = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\crss.exe\" .."	crss.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\f5101deccaff383a92d229a66cb9c194 = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\crss.exe\" .."	crss.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\Microsoft.NET\Framework64\v2.0.50727\config\security.config.cch.new	8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372.exe
File created	C:\Windows\Microsoft.NET\Framework64\v2.0.50727\config\enterprisesec.config.cch.new	8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372.exe

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

System Information Discovery
T1082

Suspicious use of AdjustPrivilegeToken 33 IoCs

description	pid	Process
Token: SeDebugPrivilege	2376	crss.exe
Token: 33	2376	crss.exe
Token: SeIncBasePriorityPrivilege	2376	crss.exe
Token: 33	2376	crss.exe
Token: SeIncBasePriorityPrivilege	2376	crss.exe
Token: 33	2376	crss.exe
Token: SeIncBasePriorityPrivilege	2376	crss.exe
Token: 33	2376	crss.exe
Token: SeIncBasePriorityPrivilege	2376	crss.exe
Token: 33	2376	crss.exe
Token: SeIncBasePriorityPrivilege	2376	crss.exe
Token: 33	2376	crss.exe
Token: SeIncBasePriorityPrivilege	2376	crss.exe
Token: 33	2376	crss.exe
Token: SeIncBasePriorityPrivilege	2376	crss.exe
Token: 33	2376	crss.exe
Token: SeIncBasePriorityPrivilege	2376	crss.exe
Token: 33	2376	crss.exe
Token: SeIncBasePriorityPrivilege	2376	crss.exe
Token: 33	2376	crss.exe
Token: SeIncBasePriorityPrivilege	2376	crss.exe
Token: 33	2376	crss.exe
Token: SeIncBasePriorityPrivilege	2376	crss.exe
Token: 33	2376	crss.exe
Token: SeIncBasePriorityPrivilege	2376	crss.exe
Token: 33	2376	crss.exe
Token: SeIncBasePriorityPrivilege	2376	crss.exe
Token: 33	2376	crss.exe
Token: SeIncBasePriorityPrivilege	2376	crss.exe
Token: 33	2376	crss.exe
Token: SeIncBasePriorityPrivilege	2376	crss.exe
Token: 33	2376	crss.exe
Token: SeIncBasePriorityPrivilege	2376	crss.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4368 wrote to memory of 2376	4368	8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372.exe	84
PID 4368 wrote to memory of 2376	4368	8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372.exe	84
PID 2376 wrote to memory of 4720	2376	crss.exe	87
PID 2376 wrote to memory of 4720	2376	crss.exe	87

C:\Users\Admin\AppData\Local\Temp\8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372.exe
"C:\Users\Admin\AppData\Local\Temp\8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372.exe"
1⤵
- Checks computer location settings
- Drops file in Windows directory
- Suspicious use of WriteProcessMemory
PID:4368
- C:\Users\Admin\AppData\Local\Temp\crss.exe
  "C:\Users\Admin\AppData\Local\Temp\crss.exe"
  2⤵
  - Executes dropped EXE
  - Drops startup file
  - Adds Run key to start application
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2376
- - C:\Windows\SYSTEM32\netsh.exe
    netsh firewall add allowedprogram "C:\Users\Admin\AppData\Local\Temp\crss.exe" "crss.exe" ENABLE
    3⤵
    - Modifies Windows Firewall
    PID:4720

Network

MITRE ATT&CK Enterprise 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

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\crss.exe

Filesize
38KB

MD5
80669037be14749384c364424db64fd0

SHA1
df7d67cff05d6b905660c70907187f87cad411d5

SHA256
8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372

SHA512
681cefdac862bd33ba016ae317c92841758c85a13d6a987191e69ab24a700ca501222f87e36a4b277fd736df88b068675f1a98b1c51a28ff5261144149bc8394

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

Filesize
38KB

MD5
80669037be14749384c364424db64fd0

SHA1
df7d67cff05d6b905660c70907187f87cad411d5

SHA256
8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372

SHA512
681cefdac862bd33ba016ae317c92841758c85a13d6a987191e69ab24a700ca501222f87e36a4b277fd736df88b068675f1a98b1c51a28ff5261144149bc8394

Download Submit
memory/2376-136-0x00007FFC46360000-0x00007FFC46D96000-memory.dmp

Filesize
10.2MB

Download
memory/4368-132-0x00007FFC46360000-0x00007FFC46D96000-memory.dmp

Filesize
10.2MB

Download

Analysis

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