njrat | a5ef976d928a096d7e298343b16ba54632411dc7fcb97f93e229ea24702578db

General

Target

kosomk.exe
Size

23KB
MD5

926e2c78bcea51e5309db037b18b4202
SHA1

d4b80f95bfdc9c2ff860ac0cc2012a81b425801d
SHA256

1d74f423f423175189fbe07b34697cae04d6d48181efbed5c3b790a137145f10
SHA512

6962876b91bcf7d40d9250dde094ce560f3b3c7a4766ac5e810d27de46cd4167937042d5ae94b21f21a1b19dc4c39dc0107e2aac1fbcd17680345f2fe06354a1
SSDEEP

384:Ac6CqbFYh3odrVCGiHssDB4b6i6fgpEupNXRmRvR6JZlbw8hqIusZzZ0k:/IU0tw3RpcnuK

Score

10^/10

njrat discovery evasion persistence privilege_escalation trojan

Malware Config

Signatures

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

Modifies Windows Firewall 2 TTPs 1 IoCs

evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
3896	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-1-5-21-1302416131-1437503476-2806442725-1000\Control Panel\International\Geo\Nation	kosomk.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\a8c0d4cf5cfc2cc1149b5e071c2ab5df.exe	dicsord.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\a8c0d4cf5cfc2cc1149b5e071c2ab5df.exe	dicsord.exe

Executes dropped EXE 1 IoCs

pid	Process
3288	dicsord.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-1-5-21-1302416131-1437503476-2806442725-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\a8c0d4cf5cfc2cc1149b5e071c2ab5df = "\"C:\\Users\\Admin\\AppData\\Roaming\\dicsord.exe\" .."	dicsord.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\a8c0d4cf5cfc2cc1149b5e071c2ab5df = "\"C:\\Users\\Admin\\AppData\\Roaming\\dicsord.exe\" .."	dicsord.exe

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

System Information Discovery
T1082

Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

persistence privilege_escalation

Netsh Helper DLL

T1546.007

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key queried	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key value enumerated	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	kosomk.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	dicsord.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe

Suspicious use of AdjustPrivilegeToken 35 IoCs

description	pid	Process
Token: SeDebugPrivilege	3288	dicsord.exe
Token: 33	3288	dicsord.exe
Token: SeIncBasePriorityPrivilege	3288	dicsord.exe
Token: 33	3288	dicsord.exe
Token: SeIncBasePriorityPrivilege	3288	dicsord.exe
Token: 33	3288	dicsord.exe
Token: SeIncBasePriorityPrivilege	3288	dicsord.exe
Token: 33	3288	dicsord.exe
Token: SeIncBasePriorityPrivilege	3288	dicsord.exe
Token: 33	3288	dicsord.exe
Token: SeIncBasePriorityPrivilege	3288	dicsord.exe
Token: 33	3288	dicsord.exe
Token: SeIncBasePriorityPrivilege	3288	dicsord.exe
Token: 33	3288	dicsord.exe
Token: SeIncBasePriorityPrivilege	3288	dicsord.exe
Token: 33	3288	dicsord.exe
Token: SeIncBasePriorityPrivilege	3288	dicsord.exe
Token: 33	3288	dicsord.exe
Token: SeIncBasePriorityPrivilege	3288	dicsord.exe
Token: 33	3288	dicsord.exe
Token: SeIncBasePriorityPrivilege	3288	dicsord.exe
Token: 33	3288	dicsord.exe
Token: SeIncBasePriorityPrivilege	3288	dicsord.exe
Token: 33	3288	dicsord.exe
Token: SeIncBasePriorityPrivilege	3288	dicsord.exe
Token: 33	3288	dicsord.exe
Token: SeIncBasePriorityPrivilege	3288	dicsord.exe
Token: 33	3288	dicsord.exe
Token: SeIncBasePriorityPrivilege	3288	dicsord.exe
Token: 33	3288	dicsord.exe
Token: SeIncBasePriorityPrivilege	3288	dicsord.exe
Token: 33	3288	dicsord.exe
Token: SeIncBasePriorityPrivilege	3288	dicsord.exe
Token: 33	3288	dicsord.exe
Token: SeIncBasePriorityPrivilege	3288	dicsord.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4732 wrote to memory of 3288	4732	kosomk.exe	92
PID 4732 wrote to memory of 3288	4732	kosomk.exe	92
PID 4732 wrote to memory of 3288	4732	kosomk.exe	92
PID 3288 wrote to memory of 3896	3288	dicsord.exe	95
PID 3288 wrote to memory of 3896	3288	dicsord.exe	95
PID 3288 wrote to memory of 3896	3288	dicsord.exe	95

C:\Users\Admin\AppData\Local\Temp\kosomk.exe
"C:\Users\Admin\AppData\Local\Temp\kosomk.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4732
- C:\Users\Admin\AppData\Roaming\dicsord.exe
  "C:\Users\Admin\AppData\Roaming\dicsord.exe"
  2⤵
  - Drops startup file
  - Executes dropped EXE
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3288
- - C:\Windows\SysWOW64\netsh.exe
    netsh firewall add allowedprogram "C:\Users\Admin\AppData\Roaming\dicsord.exe" "dicsord.exe" ENABLE
    3⤵
    - Modifies Windows Firewall
    - Event Triggered Execution: Netsh Helper DLL
    - System Location Discovery: System Language Discovery
    PID:3896

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Create or Modify System Process

1

T1543

Windows Service

1

T1543.003

Event Triggered Execution

1

T1546

Netsh Helper DLL

1

T1546.007

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Create or Modify System Process

1

T1543

Windows Service

1

T1543.003

Event Triggered Execution

1

T1546

Netsh Helper DLL

1

T1546.007

Defense Evasion

Impair Defenses

1

T1562

Disable or Modify System Firewall

Modify Registry

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\dicsord.exe

Filesize
23KB

MD5
926e2c78bcea51e5309db037b18b4202

SHA1
d4b80f95bfdc9c2ff860ac0cc2012a81b425801d

SHA256
1d74f423f423175189fbe07b34697cae04d6d48181efbed5c3b790a137145f10

SHA512
6962876b91bcf7d40d9250dde094ce560f3b3c7a4766ac5e810d27de46cd4167937042d5ae94b21f21a1b19dc4c39dc0107e2aac1fbcd17680345f2fe06354a1

Download Submit
memory/3288-13-0x0000000074620000-0x0000000074BD1000-memory.dmp

Filesize
5.7MB

Download
memory/3288-14-0x0000000074620000-0x0000000074BD1000-memory.dmp

Filesize
5.7MB

Download
memory/3288-15-0x0000000074620000-0x0000000074BD1000-memory.dmp

Filesize
5.7MB

Download
memory/3288-17-0x0000000074620000-0x0000000074BD1000-memory.dmp

Filesize
5.7MB

Download
memory/3288-18-0x0000000074620000-0x0000000074BD1000-memory.dmp

Filesize
5.7MB

Download
memory/4732-0-0x0000000074622000-0x0000000074623000-memory.dmp

Filesize
4KB

Download
memory/4732-1-0x0000000074620000-0x0000000074BD1000-memory.dmp

Filesize
5.7MB

Download
memory/4732-2-0x0000000074620000-0x0000000074BD1000-memory.dmp

Filesize
5.7MB

Download
memory/4732-12-0x0000000074620000-0x0000000074BD1000-memory.dmp

Filesize
5.7MB

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads