agenttesla | d4c387dadf62661ef2d3082a62c2afbc1ed0710dac9973870e5e06a1724297de

Analysis

max time kernel
83s
max time network
73s
platform
windows10-1703_x64
resource
win10-20230621-en
resource tags

arch:x64arch:x86image:win10-20230621-enlocale:en-usos:windows10-1703-x64system
submitted
02-07-2023 18:36

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General

Target

NitroRansomware.exe
Size

1.3MB
MD5

81549c5d1213c5fd10da736d9d0f2a5e
SHA1

1bd47c7361843aa6662ca4d403542c0f18aed8ea
SHA256

d4c387dadf62661ef2d3082a62c2afbc1ed0710dac9973870e5e06a1724297de
SHA512

e32f6d593fb356ce046f2ac652dab0d4a84a3ab1924c94a819309f1ad3d6056c86aee785f1289573c374128a4e164a8988cdc79e77906c9705c0f0888f7ba6a3
SSDEEP

24576:qoYGGjodngwtlaHxN8KUWVe6tw2wvKhLnekqjVnlqud+/2P+A6zP:qoYG2odngwwHv5VbtHw1kqXfd+/9A

Score

10^/10

agenttesla nitro evasion keylogger persistence ransomware spyware stealer trojan

Malware Config

Signatures

AgentTesla
Agent Tesla is a remote access tool (RAT) written in visual basic.
keylogger trojan stealer spyware agenttesla
Nitro
A ransomware that demands Discord nitro gift codes to decrypt files.
ransomware nitro

UAC bypass 3 TTPs 1 IoCs

evasion trojan

Bypass User Account Control

T1088

Disabling Security Tools

T1089

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	NitroRansomware.exe

AgentTesla payload 1 IoCs

resource	yara_rule
behavioral1/memory/4068-204-0x00000000082B0000-0x00000000084A6000-memory.dmp	family_agenttesla

Disables Task Manager via registry modification
evasion

Modifies extensions of user files 5 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

description	ioc	Process
File created	C:\Users\Admin\Pictures\MergeTest.crw.lmao	NitroRansomware.exe
File created	C:\Users\Admin\Pictures\ReadDismount.crw.lmao	NitroRansomware.exe
File created	C:\Users\Admin\Pictures\ResolveApprove.png.lmao	NitroRansomware.exe
File created	C:\Users\Admin\Pictures\SaveInvoke.tiff.lmao	NitroRansomware.exe
File opened for modification	C:\Users\Admin\Pictures\SaveInvoke.tiff	NitroRansomware.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1032500962-593345068-3128969974-1000\Software\Microsoft\Windows\CurrentVersion\Run\NR = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\NitroRansomware.exe\""	NitroRansomware.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	NitroRansomware.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	NitroRansomware.exe

Drops desktop.ini file(s) 5 IoCs

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

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-1-5-21-1032500962-593345068-3128969974-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Roaming\\wallpaper.png"	NitroRansomware.exe

Enumerates processes with tasklist 1 TTPs 1 IoCs

Process Discovery

T1057

pid	Process
3840	tasklist.exe

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS	NitroRansomware.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemManufacturer	NitroRansomware.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemVersion	NitroRansomware.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4068	NitroRansomware.exe
4068	NitroRansomware.exe

Suspicious use of AdjustPrivilegeToken 44 IoCs

description	pid	Process
Token: SeDebugPrivilege	4068	NitroRansomware.exe
Token: SeIncreaseQuotaPrivilege	4992	wmic.exe
Token: SeSecurityPrivilege	4992	wmic.exe
Token: SeTakeOwnershipPrivilege	4992	wmic.exe
Token: SeLoadDriverPrivilege	4992	wmic.exe
Token: SeSystemProfilePrivilege	4992	wmic.exe
Token: SeSystemtimePrivilege	4992	wmic.exe
Token: SeProfSingleProcessPrivilege	4992	wmic.exe
Token: SeIncBasePriorityPrivilege	4992	wmic.exe
Token: SeCreatePagefilePrivilege	4992	wmic.exe
Token: SeBackupPrivilege	4992	wmic.exe
Token: SeRestorePrivilege	4992	wmic.exe
Token: SeShutdownPrivilege	4992	wmic.exe
Token: SeDebugPrivilege	4992	wmic.exe
Token: SeSystemEnvironmentPrivilege	4992	wmic.exe
Token: SeRemoteShutdownPrivilege	4992	wmic.exe
Token: SeUndockPrivilege	4992	wmic.exe
Token: SeManageVolumePrivilege	4992	wmic.exe
Token: 33	4992	wmic.exe
Token: 34	4992	wmic.exe
Token: 35	4992	wmic.exe
Token: 36	4992	wmic.exe
Token: SeIncreaseQuotaPrivilege	4992	wmic.exe
Token: SeSecurityPrivilege	4992	wmic.exe
Token: SeTakeOwnershipPrivilege	4992	wmic.exe
Token: SeLoadDriverPrivilege	4992	wmic.exe
Token: SeSystemProfilePrivilege	4992	wmic.exe
Token: SeSystemtimePrivilege	4992	wmic.exe
Token: SeProfSingleProcessPrivilege	4992	wmic.exe
Token: SeIncBasePriorityPrivilege	4992	wmic.exe
Token: SeCreatePagefilePrivilege	4992	wmic.exe
Token: SeBackupPrivilege	4992	wmic.exe
Token: SeRestorePrivilege	4992	wmic.exe
Token: SeShutdownPrivilege	4992	wmic.exe
Token: SeDebugPrivilege	4992	wmic.exe
Token: SeSystemEnvironmentPrivilege	4992	wmic.exe
Token: SeRemoteShutdownPrivilege	4992	wmic.exe
Token: SeUndockPrivilege	4992	wmic.exe
Token: SeManageVolumePrivilege	4992	wmic.exe
Token: 33	4992	wmic.exe
Token: 34	4992	wmic.exe
Token: 35	4992	wmic.exe
Token: 36	4992	wmic.exe
Token: SeDebugPrivilege	3840	tasklist.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4068 wrote to memory of 4992	4068	NitroRansomware.exe	67
PID 4068 wrote to memory of 4992	4068	NitroRansomware.exe	67
PID 4068 wrote to memory of 4992	4068	NitroRansomware.exe	67
PID 4068 wrote to memory of 3840	4068	NitroRansomware.exe	69
PID 4068 wrote to memory of 3840	4068	NitroRansomware.exe	69
PID 4068 wrote to memory of 3840	4068	NitroRansomware.exe	69

System policy modification 1 TTPs 1 IoCs

evasion

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	NitroRansomware.exe

C:\Users\Admin\AppData\Local\Temp\NitroRansomware.exe
"C:\Users\Admin\AppData\Local\Temp\NitroRansomware.exe"
1⤵
- UAC bypass
- Modifies extensions of user files
- Adds Run key to start application
- Checks whether UAC is enabled
- Drops desktop.ini file(s)
- Sets desktop wallpaper using registry
- Enumerates system info in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:4068
- C:\Windows\SysWOW64\Wbem\wmic.exe
  "wmic" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4992
- C:\Windows\SysWOW64\tasklist.exe
  "tasklist"
  2⤵
  - Enumerates processes with tasklist
  - Suspicious use of AdjustPrivilegeToken
  PID:3840

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Bypass User Account Control

T1088

Defense Evasion

Bypass User Account Control

T1088

Disabling Security Tools

T1089

Modify Registry

T1112

Credential Access

Discovery

Process Discovery

T1057

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Defacement

T1491

Replay Monitor

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Downloads

memory/4068-121-0x0000000000C30000-0x0000000000D7C000-memory.dmp

Filesize
1.3MB

Download
memory/4068-122-0x0000000005BD0000-0x00000000060CE000-memory.dmp

Filesize
5.0MB

Download
memory/4068-123-0x00000000055C0000-0x0000000005652000-memory.dmp

Filesize
584KB

Download
memory/4068-124-0x00000000057D0000-0x0000000005836000-memory.dmp

Filesize
408KB

Download
memory/4068-125-0x00000000056C0000-0x00000000056D0000-memory.dmp

Filesize
64KB

Download
memory/4068-128-0x0000000006F90000-0x0000000007042000-memory.dmp

Filesize
712KB

Download
memory/4068-129-0x00000000070D0000-0x0000000007146000-memory.dmp

Filesize
472KB

Download
memory/4068-130-0x0000000007150000-0x0000000007172000-memory.dmp

Filesize
136KB

Download
memory/4068-131-0x00000000071A0000-0x00000000071BE000-memory.dmp

Filesize
120KB

Download
memory/4068-203-0x0000000001550000-0x000000000155A000-memory.dmp

Filesize
40KB

Download
memory/4068-204-0x00000000082B0000-0x00000000084A6000-memory.dmp

Filesize
2.0MB

Download
memory/4068-205-0x00000000056C0000-0x00000000056D0000-memory.dmp

Filesize
64KB

Download
memory/4068-206-0x00000000056C0000-0x00000000056D0000-memory.dmp

Filesize
64KB

Download
memory/4068-208-0x00000000056C0000-0x00000000056D0000-memory.dmp

Filesize
64KB

Download
memory/4068-207-0x00000000056C0000-0x00000000056D0000-memory.dmp

Filesize
64KB

Download