agenttesla | 2c120f921e46cdb14f70e8723338ff34465495bfa3955e3df6972d606b4ed202

Resubmissions

02-07-2023 00:40

230702-a1l2rsab35 10

02-07-2023 00:38

230702-azgqnaab32 10

Analysis

max time kernel
134s
max time network
80s
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 00:40

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General

Target

NitroRansomware.exe
Size

1.3MB
MD5

4d306858073b2a678c7562a3e845a63a
SHA1

4c6364886770069508bfdd236f54f246cdf61188
SHA256

2c120f921e46cdb14f70e8723338ff34465495bfa3955e3df6972d606b4ed202
SHA512

92c85a20ec85010c04c35cc45eca023307968d5b6280391060564113b5e02b7f5e14a751f01b5c31d19d5298f87e24939570dd56b6898520c19de5703795c091
SSDEEP

24576:66YGGjodngwtlaHxN8KUWVe6tw2wvKhLnekqjVnlqud+/2P+Ap4:66YG2odngwwHv5VbtHw1kqXfd+/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/4244-224-0x0000000007FE0000-0x00000000081D6000-memory.dmp	family_agenttesla

Disables Task Manager via registry modification
evasion

Modifies extensions of user files 7 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

description	ioc	Process
File created	C:\Users\Admin\Pictures\DebugRevoke.png.lmao	NitroRansomware.exe
File created	C:\Users\Admin\Pictures\DismountOpen.tiff.lmao	NitroRansomware.exe
File opened for modification	C:\Users\Admin\Pictures\DismountOpen.tiff	NitroRansomware.exe
File created	C:\Users\Admin\Pictures\GroupSuspend.raw.lmao	NitroRansomware.exe
File created	C:\Users\Admin\Pictures\JoinOptimize.tif.lmao	NitroRansomware.exe
File created	C:\Users\Admin\Pictures\ResetUninstall.tif.lmao	NitroRansomware.exe
File created	C:\Users\Admin\Pictures\SelectOut.crw.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-1-5-21-2920667096-3376612704-1562175574-1000\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\Camera Roll\desktop.ini	NitroRansomware.exe
File opened for modification	C:\Users\Admin\Pictures\Saved Pictures\desktop.ini	NitroRansomware.exe
File opened for modification	C:\Users\Admin\Pictures\desktop.ini	NitroRansomware.exe
File opened for modification	C:\Users\Admin\Documents\desktop.ini	NitroRansomware.exe
File opened for modification	C:\Users\Admin\Desktop\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-1-5-21-2920667096-3376612704-1562175574-1000\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
4488	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\SystemVersion	NitroRansomware.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS	NitroRansomware.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemManufacturer	NitroRansomware.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4244	NitroRansomware.exe
4244	NitroRansomware.exe

Suspicious use of AdjustPrivilegeToken 44 IoCs

description	pid	Process
Token: SeDebugPrivilege	4244	NitroRansomware.exe
Token: SeIncreaseQuotaPrivilege	2140	wmic.exe
Token: SeSecurityPrivilege	2140	wmic.exe
Token: SeTakeOwnershipPrivilege	2140	wmic.exe
Token: SeLoadDriverPrivilege	2140	wmic.exe
Token: SeSystemProfilePrivilege	2140	wmic.exe
Token: SeSystemtimePrivilege	2140	wmic.exe
Token: SeProfSingleProcessPrivilege	2140	wmic.exe
Token: SeIncBasePriorityPrivilege	2140	wmic.exe
Token: SeCreatePagefilePrivilege	2140	wmic.exe
Token: SeBackupPrivilege	2140	wmic.exe
Token: SeRestorePrivilege	2140	wmic.exe
Token: SeShutdownPrivilege	2140	wmic.exe
Token: SeDebugPrivilege	2140	wmic.exe
Token: SeSystemEnvironmentPrivilege	2140	wmic.exe
Token: SeRemoteShutdownPrivilege	2140	wmic.exe
Token: SeUndockPrivilege	2140	wmic.exe
Token: SeManageVolumePrivilege	2140	wmic.exe
Token: 33	2140	wmic.exe
Token: 34	2140	wmic.exe
Token: 35	2140	wmic.exe
Token: 36	2140	wmic.exe
Token: SeIncreaseQuotaPrivilege	2140	wmic.exe
Token: SeSecurityPrivilege	2140	wmic.exe
Token: SeTakeOwnershipPrivilege	2140	wmic.exe
Token: SeLoadDriverPrivilege	2140	wmic.exe
Token: SeSystemProfilePrivilege	2140	wmic.exe
Token: SeSystemtimePrivilege	2140	wmic.exe
Token: SeProfSingleProcessPrivilege	2140	wmic.exe
Token: SeIncBasePriorityPrivilege	2140	wmic.exe
Token: SeCreatePagefilePrivilege	2140	wmic.exe
Token: SeBackupPrivilege	2140	wmic.exe
Token: SeRestorePrivilege	2140	wmic.exe
Token: SeShutdownPrivilege	2140	wmic.exe
Token: SeDebugPrivilege	2140	wmic.exe
Token: SeSystemEnvironmentPrivilege	2140	wmic.exe
Token: SeRemoteShutdownPrivilege	2140	wmic.exe
Token: SeUndockPrivilege	2140	wmic.exe
Token: SeManageVolumePrivilege	2140	wmic.exe
Token: 33	2140	wmic.exe
Token: 34	2140	wmic.exe
Token: 35	2140	wmic.exe
Token: 36	2140	wmic.exe
Token: SeDebugPrivilege	4488	tasklist.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4244 wrote to memory of 2140	4244	NitroRansomware.exe	67
PID 4244 wrote to memory of 2140	4244	NitroRansomware.exe	67
PID 4244 wrote to memory of 2140	4244	NitroRansomware.exe	67
PID 4244 wrote to memory of 4488	4244	NitroRansomware.exe	69
PID 4244 wrote to memory of 4488	4244	NitroRansomware.exe	69
PID 4244 wrote to memory of 4488	4244	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:4244
- C:\Windows\SysWOW64\Wbem\wmic.exe
  "wmic" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2140
- C:\Windows\SysWOW64\tasklist.exe
  "tasklist"
  2⤵
  - Enumerates processes with tasklist
  - Suspicious use of AdjustPrivilegeToken
  PID:4488

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/4244-117-0x0000000000910000-0x0000000000A5C000-memory.dmp

Filesize
1.3MB

Download
memory/4244-118-0x00000000057F0000-0x0000000005CEE000-memory.dmp

Filesize
5.0MB

Download
memory/4244-119-0x00000000052F0000-0x0000000005382000-memory.dmp

Filesize
584KB

Download
memory/4244-120-0x0000000005490000-0x00000000054F6000-memory.dmp

Filesize
408KB

Download
memory/4244-121-0x00000000052E0000-0x00000000052F0000-memory.dmp

Filesize
64KB

Download
memory/4244-124-0x0000000006DE0000-0x0000000006E92000-memory.dmp

Filesize
712KB

Download
memory/4244-125-0x0000000006F10000-0x0000000006F86000-memory.dmp

Filesize
472KB

Download
memory/4244-126-0x0000000006EE0000-0x0000000006F02000-memory.dmp

Filesize
136KB

Download
memory/4244-127-0x0000000006FC0000-0x0000000006FDE000-memory.dmp

Filesize
120KB

Download
memory/4244-134-0x00000000052E0000-0x00000000052F0000-memory.dmp

Filesize
64KB

Download
memory/4244-223-0x0000000001230000-0x000000000123A000-memory.dmp

Filesize
40KB

Download
memory/4244-224-0x0000000007FE0000-0x00000000081D6000-memory.dmp

Filesize
2.0MB

Download
memory/4244-225-0x00000000052E0000-0x00000000052F0000-memory.dmp

Filesize
64KB

Download
memory/4244-226-0x00000000052E0000-0x00000000052F0000-memory.dmp

Filesize
64KB

Download
memory/4244-227-0x00000000052E0000-0x00000000052F0000-memory.dmp

Filesize
64KB

Download
memory/4244-228-0x00000000052E0000-0x00000000052F0000-memory.dmp

Filesize
64KB

Download