njrat | daa8802270996f3d7b4835fd9fba42da054ad1a58403854c0f86b0666c631ac1

Analysis

max time kernel
153s
max time network
156s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
26-11-2022 11:26

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General

Target

100.exe
Size

75KB
MD5

6fe5189a35abb1d99830e92de024bd2d
SHA1

add93a5ad62ff4d923f68661727ea0c37d2053fd
SHA256

9e3ad5186e3784d866a3ed9a41e61a1ff2fbb983ce8edb330a3b069f452b636d
SHA512

7f28b95a47947f75c10763dec5a22fc77b9d249144e24c8de8824dba0dc375729f1b8a4e4aa9faeb3031ee11d1e38afbc167904f5a5061390d896673b414950c
SSDEEP

768:tbyvTDdVf5ozWBYP5SywTwiN9dguJcF4Qhc4VjsS8jAnKNu6LUEscg6U2:tbyvtVRsWyP55wTwiT2hBjsV61nV2

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
4976	AvastUpdate.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
4632	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-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	100.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\c68978aee08ac6a2f81ecf56dcaa683c.exe	AvastUpdate.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\c68978aee08ac6a2f81ecf56dcaa683c.exe	AvastUpdate.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-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\c68978aee08ac6a2f81ecf56dcaa683c = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\AvastUpdate.exe\" .."	AvastUpdate.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\c68978aee08ac6a2f81ecf56dcaa683c = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\AvastUpdate.exe\" .."	AvastUpdate.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 25 IoCs

description	pid	Process
Token: SeDebugPrivilege	4976	AvastUpdate.exe
Token: 33	4976	AvastUpdate.exe
Token: SeIncBasePriorityPrivilege	4976	AvastUpdate.exe
Token: 33	4976	AvastUpdate.exe
Token: SeIncBasePriorityPrivilege	4976	AvastUpdate.exe
Token: 33	4976	AvastUpdate.exe
Token: SeIncBasePriorityPrivilege	4976	AvastUpdate.exe
Token: 33	4976	AvastUpdate.exe
Token: SeIncBasePriorityPrivilege	4976	AvastUpdate.exe
Token: 33	4976	AvastUpdate.exe
Token: SeIncBasePriorityPrivilege	4976	AvastUpdate.exe
Token: 33	4976	AvastUpdate.exe
Token: SeIncBasePriorityPrivilege	4976	AvastUpdate.exe
Token: 33	4976	AvastUpdate.exe
Token: SeIncBasePriorityPrivilege	4976	AvastUpdate.exe
Token: 33	4976	AvastUpdate.exe
Token: SeIncBasePriorityPrivilege	4976	AvastUpdate.exe
Token: 33	4976	AvastUpdate.exe
Token: SeIncBasePriorityPrivilege	4976	AvastUpdate.exe
Token: 33	4976	AvastUpdate.exe
Token: SeIncBasePriorityPrivilege	4976	AvastUpdate.exe
Token: 33	4976	AvastUpdate.exe
Token: SeIncBasePriorityPrivilege	4976	AvastUpdate.exe
Token: 33	4976	AvastUpdate.exe
Token: SeIncBasePriorityPrivilege	4976	AvastUpdate.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4644 wrote to memory of 4976	4644	100.exe	80
PID 4644 wrote to memory of 4976	4644	100.exe	80
PID 4644 wrote to memory of 4976	4644	100.exe	80
PID 4976 wrote to memory of 4632	4976	AvastUpdate.exe	81
PID 4976 wrote to memory of 4632	4976	AvastUpdate.exe	81
PID 4976 wrote to memory of 4632	4976	AvastUpdate.exe	81

C:\Users\Admin\AppData\Local\Temp\100.exe
"C:\Users\Admin\AppData\Local\Temp\100.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4644
- C:\Users\Admin\AppData\Local\Temp\AvastUpdate.exe
  "C:\Users\Admin\AppData\Local\Temp\AvastUpdate.exe"
  2⤵
  - Executes dropped EXE
  - Drops startup file
  - Adds Run key to start application
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4976
- - C:\Windows\SysWOW64\netsh.exe
    netsh firewall add allowedprogram "C:\Users\Admin\AppData\Local\Temp\AvastUpdate.exe" "AvastUpdate.exe" ENABLE
    3⤵
    - Modifies Windows Firewall
    PID:4632

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

T1031

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
75KB

MD5
6fe5189a35abb1d99830e92de024bd2d

SHA1
add93a5ad62ff4d923f68661727ea0c37d2053fd

SHA256
9e3ad5186e3784d866a3ed9a41e61a1ff2fbb983ce8edb330a3b069f452b636d

SHA512
7f28b95a47947f75c10763dec5a22fc77b9d249144e24c8de8824dba0dc375729f1b8a4e4aa9faeb3031ee11d1e38afbc167904f5a5061390d896673b414950c

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

Filesize
75KB

MD5
6fe5189a35abb1d99830e92de024bd2d

SHA1
add93a5ad62ff4d923f68661727ea0c37d2053fd

SHA256
9e3ad5186e3784d866a3ed9a41e61a1ff2fbb983ce8edb330a3b069f452b636d

SHA512
7f28b95a47947f75c10763dec5a22fc77b9d249144e24c8de8824dba0dc375729f1b8a4e4aa9faeb3031ee11d1e38afbc167904f5a5061390d896673b414950c

Download Submit
memory/4644-132-0x0000000075010000-0x00000000755C1000-memory.dmp

Filesize
5.7MB

Download
memory/4644-133-0x0000000075010000-0x00000000755C1000-memory.dmp

Filesize
5.7MB

Download
memory/4644-137-0x0000000075010000-0x00000000755C1000-memory.dmp

Filesize
5.7MB

Download
memory/4976-138-0x0000000075010000-0x00000000755C1000-memory.dmp

Filesize
5.7MB

Download
memory/4976-139-0x0000000075010000-0x00000000755C1000-memory.dmp

Filesize
5.7MB

Download