nitro | a0570660e7e0a9f97c0b7f5928ec4b2ca4332054a34eb4432d0b986b326cb81a

Analysis

max time kernel
147s
max time network
130s
platform
windows11-21h2_x64
resource
win11-20250502-en
resource tags

arch:x64arch:x86image:win11-20250502-enlocale:en-usos:windows11-21h2-x64system
submitted
28/05/2025, 17:30

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General

Target
MainTree.exe
Size 61KB
Sample250528-v3arqs1ms8
SHA256 a0570660e7e0a9f97c0b7f5928ec4b2ca4332054a34eb4432d0b986b326cb81a
MD5 e9c9cb2ddc4e64343fc6e4e514c8b5c2
SHA1 3536cbd8bf15c084495651264b7863e9a08e9c3f
SHA512 841604b018b696705c85d030297d9e545b39dfc71b4a366392dcdbe1b8ef16f15738cb57444f1a2a8ec0dad5bb4b547c85c84481197cbd0d7a8d38407a355c0e
SSDEEP 768:gKsMqCXfVcWBqM9ZkiANIUk/YLDwUzc80gmq3oP/oDj:gKseEM9ZkiAPDr/0O8/oH
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

nitro discovery persistence ransomware spyware stealer

Malware Config

Signatures

Nitro
A ransomware that demands Discord nitro gift codes to decrypt files.
ransomware nitro
Nitro family
nitro
Renames multiple (119) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
ransomware
Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3588213599-686740421-4058676312-1000\Software\Microsoft\Windows\CurrentVersion\Run\NR = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\MainTree.exe\""	MainTree.exe

Drops desktop.ini file(s) 5 IoCs

description	ioc	Process
File opened for modification	C:\Users\Admin\Documents\desktop.ini	MainTree.exe
File opened for modification	C:\Users\Admin\Pictures\desktop.ini	MainTree.exe
File opened for modification	C:\Users\Admin\Desktop\desktop.ini	MainTree.exe
File opened for modification	C:\Users\Admin\Pictures\Camera Roll\desktop.ini	MainTree.exe
File opened for modification	C:\Users\Admin\Pictures\Saved Pictures\desktop.ini	MainTree.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 6 IoCs

Web Service

T1102

flow	ioc
1	discord.com
3	discord.com
5	discord.com
9	discord.com
16	discord.com
21	discord.com

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
1	api.ipify.org
2	api.ipify.org

Sets desktop wallpaper using registry 2 TTPs 1 IoCs

ransomware

Defacement

T1491

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3588213599-686740421-4058676312-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Roaming\\wallpaper.png"	MainTree.exe

System Location Discovery: System Language Discovery 1 TTPs 4 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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	MainTree.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WMIC.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	MainTree.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4200	MainTree.exe
4200	MainTree.exe

Suspicious use of AdjustPrivilegeToken 43 IoCs

description	pid	Process
Token: SeDebugPrivilege	4200	MainTree.exe
Token: SeIncreaseQuotaPrivilege	728	WMIC.exe
Token: SeSecurityPrivilege	728	WMIC.exe
Token: SeTakeOwnershipPrivilege	728	WMIC.exe
Token: SeLoadDriverPrivilege	728	WMIC.exe
Token: SeSystemProfilePrivilege	728	WMIC.exe
Token: SeSystemtimePrivilege	728	WMIC.exe
Token: SeProfSingleProcessPrivilege	728	WMIC.exe
Token: SeIncBasePriorityPrivilege	728	WMIC.exe
Token: SeCreatePagefilePrivilege	728	WMIC.exe
Token: SeBackupPrivilege	728	WMIC.exe
Token: SeRestorePrivilege	728	WMIC.exe
Token: SeShutdownPrivilege	728	WMIC.exe
Token: SeDebugPrivilege	728	WMIC.exe
Token: SeSystemEnvironmentPrivilege	728	WMIC.exe
Token: SeRemoteShutdownPrivilege	728	WMIC.exe
Token: SeUndockPrivilege	728	WMIC.exe
Token: SeManageVolumePrivilege	728	WMIC.exe
Token: 33	728	WMIC.exe
Token: 34	728	WMIC.exe
Token: 35	728	WMIC.exe
Token: 36	728	WMIC.exe
Token: SeIncreaseQuotaPrivilege	728	WMIC.exe
Token: SeSecurityPrivilege	728	WMIC.exe
Token: SeTakeOwnershipPrivilege	728	WMIC.exe
Token: SeLoadDriverPrivilege	728	WMIC.exe
Token: SeSystemProfilePrivilege	728	WMIC.exe
Token: SeSystemtimePrivilege	728	WMIC.exe
Token: SeProfSingleProcessPrivilege	728	WMIC.exe
Token: SeIncBasePriorityPrivilege	728	WMIC.exe
Token: SeCreatePagefilePrivilege	728	WMIC.exe
Token: SeBackupPrivilege	728	WMIC.exe
Token: SeRestorePrivilege	728	WMIC.exe
Token: SeShutdownPrivilege	728	WMIC.exe
Token: SeDebugPrivilege	728	WMIC.exe
Token: SeSystemEnvironmentPrivilege	728	WMIC.exe
Token: SeRemoteShutdownPrivilege	728	WMIC.exe
Token: SeUndockPrivilege	728	WMIC.exe
Token: SeManageVolumePrivilege	728	WMIC.exe
Token: 33	728	WMIC.exe
Token: 34	728	WMIC.exe
Token: 35	728	WMIC.exe
Token: 36	728	WMIC.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 4200 wrote to memory of 5020	4200	MainTree.exe	85
PID 4200 wrote to memory of 5020	4200	MainTree.exe	85
PID 4200 wrote to memory of 5020	4200	MainTree.exe	85
PID 4956 wrote to memory of 4512	4956	cmd.exe	87
PID 4956 wrote to memory of 4512	4956	cmd.exe	87
PID 4956 wrote to memory of 4512	4956	cmd.exe	87
PID 5020 wrote to memory of 728	5020	cmd.exe	88
PID 5020 wrote to memory of 728	5020	cmd.exe	88
PID 5020 wrote to memory of 728	5020	cmd.exe	88

C:\Users\Admin\AppData\Local\Temp\MainTree.exe
"C:\Users\Admin\AppData\Local\Temp\MainTree.exe"
1⤵
- Adds Run key to start application
- Drops desktop.ini file(s)
- Sets desktop wallpaper using registry
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4200
- C:\Windows\SysWOW64\cmd.exe
  "cmd.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5020
- - C:\Windows\SysWOW64\Wbem\WMIC.exe
    wmic csproduct get uuid
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:728

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\MainTree.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4956
- C:\Users\Admin\AppData\Local\Temp\MainTree.exe
  C:\Users\Admin\AppData\Local\Temp\MainTree.exe
  2⤵
  - System Location Discovery: System Language Discovery
  PID:4512