njrat | ec4cd327cf62d00bd67b54eb786c6e81af270fdc17d31d6861670aefdaa92ea1

General

Target

extrim.exe
Size

25KB
MD5

e57942bcdcbea1e24f8eb91f28d941ed
SHA1

03a80129434d5721a1883f8cde5b89b94ded4026
SHA256

ec4cd327cf62d00bd67b54eb786c6e81af270fdc17d31d6861670aefdaa92ea1
SHA512

e6fa2f08b9d339b5de2483373891dad44e6b7ff832190770acabd005c1987acac2c22891b272a73861e86b2e7b65ca681e42774141023809beac46a6b6f7c422
SSDEEP

768:5vkgXF2UVmVknCwRRi7iEIk9Pm5huNR2R:ygQUVm4CwRRqD9PwuNR2R

Score

10^/10

njrat ??????? ??????? ??????? ?? ????persistence trojan

Malware Config

Extracted

Family

njrat

Version

Njrat 0.7 Golden By Hassan Amiri

Botnet

??????? ??????? ??????? ?? ????

C2

10.0.0.100:5552

Mutex

Windows Update

Attributes

reg_key
Windows Update
splitter
|Hassan|

Signatures

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

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-1-5-21-355097885-2402257403-2971294179-1000\Control Panel\International\Geo\Nation	extrim.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 3 IoCs

pid	Process
4968	Dllhost.exe
4436	Server.exe
4828	Server.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-355097885-2402257403-2971294179-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Windows Update = "\"C:\\Users\\Admin\\AppData\\Roaming\\Dllhost.exe\" .."	Dllhost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Windows Update = "\"C:\\Users\\Admin\\AppData\\Roaming\\Dllhost.exe\" .."	Dllhost.exe

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

System Information Discovery
T1082

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
2396	schtasks.exe

Suspicious behavior: GetForegroundWindowSpam 3 IoCs

pid	Process
784	extrim.exe
4968	Dllhost.exe
4828	Server.exe

Suspicious use of AdjustPrivilegeToken 31 IoCs

description	pid	Process
Token: SeDebugPrivilege	4968	Dllhost.exe
Token: 33	4968	Dllhost.exe
Token: SeIncBasePriorityPrivilege	4968	Dllhost.exe
Token: 33	4968	Dllhost.exe
Token: SeIncBasePriorityPrivilege	4968	Dllhost.exe
Token: 33	4968	Dllhost.exe
Token: SeIncBasePriorityPrivilege	4968	Dllhost.exe
Token: 33	4968	Dllhost.exe
Token: SeIncBasePriorityPrivilege	4968	Dllhost.exe
Token: 33	4968	Dllhost.exe
Token: SeIncBasePriorityPrivilege	4968	Dllhost.exe
Token: 33	4968	Dllhost.exe
Token: SeIncBasePriorityPrivilege	4968	Dllhost.exe
Token: 33	4968	Dllhost.exe
Token: SeIncBasePriorityPrivilege	4968	Dllhost.exe
Token: 33	4968	Dllhost.exe
Token: SeIncBasePriorityPrivilege	4968	Dllhost.exe
Token: 33	4968	Dllhost.exe
Token: SeIncBasePriorityPrivilege	4968	Dllhost.exe
Token: 33	4968	Dllhost.exe
Token: SeIncBasePriorityPrivilege	4968	Dllhost.exe
Token: 33	4968	Dllhost.exe
Token: SeIncBasePriorityPrivilege	4968	Dllhost.exe
Token: 33	4968	Dllhost.exe
Token: SeIncBasePriorityPrivilege	4968	Dllhost.exe
Token: 33	4968	Dllhost.exe
Token: SeIncBasePriorityPrivilege	4968	Dllhost.exe
Token: 33	4968	Dllhost.exe
Token: SeIncBasePriorityPrivilege	4968	Dllhost.exe
Token: 33	4968	Dllhost.exe
Token: SeIncBasePriorityPrivilege	4968	Dllhost.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 784 wrote to memory of 4968	784	extrim.exe	91
PID 784 wrote to memory of 4968	784	extrim.exe	91
PID 4968 wrote to memory of 2396	4968	Dllhost.exe	95
PID 4968 wrote to memory of 2396	4968	Dllhost.exe	95

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\extrim.exe
"C:\Users\Admin\AppData\Local\Temp\extrim.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of WriteProcessMemory
PID:784
- C:\Users\Admin\AppData\Roaming\Dllhost.exe
  "C:\Users\Admin\AppData\Roaming\Dllhost.exe"
  2⤵
  - Drops startup file
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4968
- - C:\Windows\SYSTEM32\schtasks.exe
    schtasks /create /sc minute /mo 1 /tn Server /tr C:\Users\Admin\AppData\Local\Temp/Server.exe
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2396

C:\Users\Admin\AppData\Local\Temp\Server.exe
C:\Users\Admin\AppData\Local\Temp/Server.exe
1⤵
- Executes dropped EXE
PID:4436

C:\Users\Admin\AppData\Local\Temp\Server.exe
C:\Users\Admin\AppData\Local\Temp/Server.exe
1⤵
- Executes dropped EXE
- Suspicious behavior: GetForegroundWindowSpam
PID:4828

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
408B

MD5
4a02286231546d5a837701befc9aeafa

SHA1
ca28fba9e5d36d4093ca5a5c0d9cc6fa88756710

SHA256
c55d933eb6b3c6317d6c0ef97e400222493bafa7cf2007e8b2fd0653288a560f

SHA512
5f27784009926af504353da5442acc75cb6509d942c3b7931f386408f5e0d6e4b0fec421f902b04af65ec3116850bb0e82e968d458b0632bb5f451bc5f4a7f93

Download Submit
C:\Users\Admin\AppData\Roaming\Dllhost.exe

Filesize
25KB

MD5
e57942bcdcbea1e24f8eb91f28d941ed

SHA1
03a80129434d5721a1883f8cde5b89b94ded4026

SHA256
ec4cd327cf62d00bd67b54eb786c6e81af270fdc17d31d6861670aefdaa92ea1

SHA512
e6fa2f08b9d339b5de2483373891dad44e6b7ff832190770acabd005c1987acac2c22891b272a73861e86b2e7b65ca681e42774141023809beac46a6b6f7c422

Download Submit
memory/784-5-0x00007FFF95F40000-0x00007FFF968E1000-memory.dmp

Filesize
9.6MB

Download
memory/784-3-0x00000000013E0000-0x00000000013F2000-memory.dmp

Filesize
72KB

Download
memory/784-4-0x000000001BA40000-0x000000001BAE6000-memory.dmp

Filesize
664KB

Download
memory/784-6-0x000000001CBD0000-0x000000001CC6C000-memory.dmp

Filesize
624KB

Download
memory/784-2-0x000000001C050000-0x000000001C51E000-memory.dmp

Filesize
4.8MB

Download
memory/784-16-0x00007FFF95F40000-0x00007FFF968E1000-memory.dmp

Filesize
9.6MB

Download
memory/784-0-0x00007FFF961F5000-0x00007FFF961F6000-memory.dmp

Filesize
4KB

Download
memory/784-1-0x00007FFF95F40000-0x00007FFF968E1000-memory.dmp

Filesize
9.6MB

Download
memory/4436-29-0x00007FFF95F40000-0x00007FFF968E1000-memory.dmp

Filesize
9.6MB

Download
memory/4436-32-0x00007FFF95F40000-0x00007FFF968E1000-memory.dmp

Filesize
9.6MB

Download
memory/4436-30-0x0000000001450000-0x0000000001462000-memory.dmp

Filesize
72KB

Download
memory/4828-35-0x0000000001390000-0x00000000013A2000-memory.dmp

Filesize
72KB

Download
memory/4968-17-0x00007FFF95F40000-0x00007FFF968E1000-memory.dmp

Filesize
9.6MB

Download
memory/4968-25-0x00007FFF95F40000-0x00007FFF968E1000-memory.dmp

Filesize
9.6MB

Download
memory/4968-26-0x00007FFF95F40000-0x00007FFF968E1000-memory.dmp

Filesize
9.6MB

Download
memory/4968-24-0x0000000000E60000-0x0000000000E68000-memory.dmp

Filesize
32KB

Download
memory/4968-23-0x00007FFF95F40000-0x00007FFF968E1000-memory.dmp

Filesize
9.6MB

Download
memory/4968-20-0x00007FFF95F40000-0x00007FFF968E1000-memory.dmp

Filesize
9.6MB

Download
memory/4968-19-0x00007FFF95F40000-0x00007FFF968E1000-memory.dmp

Filesize
9.6MB

Download
memory/4968-18-0x0000000000E50000-0x0000000000E62000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads