agenttesla | 7dc509779753238fde335d4471b1c14f3cdb81c44a0bf8063263e668d7b551d0

Resubmissions

05-07-2023 01:56

230705-ccwbmsab88 10

05-07-2023 01:53

230705-cbf6bsbg5w 10

Analysis

max time kernel
74s
max time network
71s
platform
windows10-1703_x64
resource
win10-20230703-en
resource tags

arch:x64arch:x86image:win10-20230703-enlocale:en-usos:windows10-1703-x64system
submitted
05-07-2023 01:56

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General

Target

NitroRansomware.exe
Size

1.7MB
MD5

e18bbc64d2e7eab468dfb1eb524e4136
SHA1

4ea066712286c05c02160bfdcbf8ad2a903e5a1b
SHA256

7dc509779753238fde335d4471b1c14f3cdb81c44a0bf8063263e668d7b551d0
SHA512

d5d2655146a21e94cb393acfa520f5e90757162ff850ba87e99ef598fb9135c4978859bfd843ee94923685ea3d1ad47b9393edb0adb9d4fa48884f7602026f78
SSDEEP

49152:LocYGwfZPnlXMTdngwwHv5VbtHw1kqXfd+/9AE:LoBDZdcNgNhVRw1kqXf0F

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/4652-211-0x00000000097B0000-0x00000000099A6000-memory.dmp	family_agenttesla

Disables Task Manager via registry modification
evasion

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\drivers\etc\hosts	NitroRansomware.exe

Modifies extensions of user files 2 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

description	ioc	Process
File created	C:\Users\Admin\Pictures\RepairRemove.png.lmao	NitroRansomware.exe
File created	C:\Users\Admin\Pictures\StartSend.raw.lmao	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-1-5-21-3229013990-3330391637-2814184332-1000\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-1-5-21-3229013990-3330391637-2814184332-1000\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
5068	tasklist.exe

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

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

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4652	NitroRansomware.exe
4652	NitroRansomware.exe

Suspicious use of AdjustPrivilegeToken 44 IoCs

description	pid	Process
Token: SeDebugPrivilege	4652	NitroRansomware.exe
Token: SeIncreaseQuotaPrivilege	2652	wmic.exe
Token: SeSecurityPrivilege	2652	wmic.exe
Token: SeTakeOwnershipPrivilege	2652	wmic.exe
Token: SeLoadDriverPrivilege	2652	wmic.exe
Token: SeSystemProfilePrivilege	2652	wmic.exe
Token: SeSystemtimePrivilege	2652	wmic.exe
Token: SeProfSingleProcessPrivilege	2652	wmic.exe
Token: SeIncBasePriorityPrivilege	2652	wmic.exe
Token: SeCreatePagefilePrivilege	2652	wmic.exe
Token: SeBackupPrivilege	2652	wmic.exe
Token: SeRestorePrivilege	2652	wmic.exe
Token: SeShutdownPrivilege	2652	wmic.exe
Token: SeDebugPrivilege	2652	wmic.exe
Token: SeSystemEnvironmentPrivilege	2652	wmic.exe
Token: SeRemoteShutdownPrivilege	2652	wmic.exe
Token: SeUndockPrivilege	2652	wmic.exe
Token: SeManageVolumePrivilege	2652	wmic.exe
Token: 33	2652	wmic.exe
Token: 34	2652	wmic.exe
Token: 35	2652	wmic.exe
Token: 36	2652	wmic.exe
Token: SeIncreaseQuotaPrivilege	2652	wmic.exe
Token: SeSecurityPrivilege	2652	wmic.exe
Token: SeTakeOwnershipPrivilege	2652	wmic.exe
Token: SeLoadDriverPrivilege	2652	wmic.exe
Token: SeSystemProfilePrivilege	2652	wmic.exe
Token: SeSystemtimePrivilege	2652	wmic.exe
Token: SeProfSingleProcessPrivilege	2652	wmic.exe
Token: SeIncBasePriorityPrivilege	2652	wmic.exe
Token: SeCreatePagefilePrivilege	2652	wmic.exe
Token: SeBackupPrivilege	2652	wmic.exe
Token: SeRestorePrivilege	2652	wmic.exe
Token: SeShutdownPrivilege	2652	wmic.exe
Token: SeDebugPrivilege	2652	wmic.exe
Token: SeSystemEnvironmentPrivilege	2652	wmic.exe
Token: SeRemoteShutdownPrivilege	2652	wmic.exe
Token: SeUndockPrivilege	2652	wmic.exe
Token: SeManageVolumePrivilege	2652	wmic.exe
Token: 33	2652	wmic.exe
Token: 34	2652	wmic.exe
Token: 35	2652	wmic.exe
Token: 36	2652	wmic.exe
Token: SeDebugPrivilege	5068	tasklist.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4652 wrote to memory of 2652	4652	NitroRansomware.exe	70
PID 4652 wrote to memory of 2652	4652	NitroRansomware.exe	70
PID 4652 wrote to memory of 2652	4652	NitroRansomware.exe	70
PID 4652 wrote to memory of 5068	4652	NitroRansomware.exe	72
PID 4652 wrote to memory of 5068	4652	NitroRansomware.exe	72
PID 4652 wrote to memory of 5068	4652	NitroRansomware.exe	72

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
- Drops file in Drivers directory
- 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:4652
- C:\Windows\SysWOW64\Wbem\wmic.exe
  "wmic" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2652
- C:\Windows\SysWOW64\tasklist.exe
  "tasklist"
  2⤵
  - Enumerates processes with tasklist
  - Suspicious use of AdjustPrivilegeToken
  PID:5068

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/4652-117-0x0000000000180000-0x0000000000334000-memory.dmp

Filesize
1.7MB

Download
memory/4652-118-0x0000000005220000-0x000000000571E000-memory.dmp

Filesize
5.0MB

Download
memory/4652-119-0x0000000004D20000-0x0000000004DB2000-memory.dmp

Filesize
584KB

Download
memory/4652-121-0x0000000007380000-0x00000000073E6000-memory.dmp

Filesize
408KB

Download
memory/4652-122-0x0000000004D10000-0x0000000004D20000-memory.dmp

Filesize
64KB

Download
memory/4652-125-0x0000000008740000-0x00000000087F2000-memory.dmp

Filesize
712KB

Download
memory/4652-126-0x0000000008880000-0x00000000088F6000-memory.dmp

Filesize
472KB

Download
memory/4652-127-0x0000000008900000-0x0000000008922000-memory.dmp

Filesize
136KB

Download
memory/4652-128-0x0000000008950000-0x000000000896E000-memory.dmp

Filesize
120KB

Download
memory/4652-138-0x0000000004D10000-0x0000000004D20000-memory.dmp

Filesize
64KB

Download
memory/4652-210-0x0000000000730000-0x000000000073A000-memory.dmp

Filesize
40KB

Download
memory/4652-211-0x00000000097B0000-0x00000000099A6000-memory.dmp

Filesize
2.0MB

Download
memory/4652-212-0x0000000004D10000-0x0000000004D20000-memory.dmp

Filesize
64KB

Download
memory/4652-213-0x0000000004D10000-0x0000000004D20000-memory.dmp

Filesize
64KB

Download
memory/4652-214-0x0000000004D10000-0x0000000004D20000-memory.dmp

Filesize
64KB

Download
memory/4652-215-0x0000000004D10000-0x0000000004D20000-memory.dmp

Filesize
64KB

Download