agenttesla | 604a2f99191e372f62b11a4a1009e8adc41f43a8bbf3f26735549889914f0fc7

General

Target
YPeBi8FRoTIc8md.exe
Size 729KB
Sample200831-vmkvbv16d2
SHA256 604a2f99191e372f62b11a4a1009e8adc41f43a8bbf3f26735549889914f0fc7
MD5 a3c32145cd008844ed15f214b02e35e4
SHA1 e082d807d559e2440438a533974eb568191001e6
SHA512 a094cd2bd1112ba2c858f495c297b03180ce16f7166d264e4793fc52a4786f01f358ed8938c4c0d00b555ebf5527d469e4dd7519db2c42d55096ff7fbefc0c4b
MD5 SHA1 SHA512

Score

10^/10

keylogger stealer persistence spyware evasion trojan agenttesla

Malware Config

Signatures

AgentTesla
Agent Tesla is a remote access tool (RAT) written in visual basic.
keylogger trojan stealer spyware agenttesla

AgentTesla Payload 7 IoCs

keylogger stealer

resource	yara_rule
behavioral1/memory/2020-8-0x0000000000400000-0x000000000045C000-memory.dmp	agent_tesla
behavioral1/memory/2020-8-0x0000000000400000-0x000000000045C000-memory.dmp	agent_tesla
behavioral1/memory/2020-9-0x000000000045653E-mapping.dmp	agent_tesla
behavioral1/memory/2020-10-0x0000000000400000-0x000000000045C000-memory.dmp	agent_tesla
behavioral1/memory/2020-10-0x0000000000400000-0x000000000045C000-memory.dmp	agent_tesla
behavioral1/memory/2020-11-0x0000000000400000-0x000000000045C000-memory.dmp	agent_tesla
behavioral1/memory/2020-11-0x0000000000400000-0x000000000045C000-memory.dmp	agent_tesla

Looks for VirtualBox Guest Additions in registry 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497
Looks for VMWare Tools registry key 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	YPeBi8FRoTIc8md.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	YPeBi8FRoTIc8md.exe

Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
spyware

Data from Local System
T1005

Credentials in Files
T1081
Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
spyware

Data from Local System
T1005

Credentials in Files
T1081
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware

Data from Local System
T1005

Credentials in Files
T1081

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-1-5-21-2090973689-680783404-4292415065-1000\Software\Microsoft\Windows\CurrentVersion\Run\NewApp = "C:\\Users\\Admin\\AppData\\Roaming\\NewApp\\NewApp.exe"	YPeBi8FRoTIc8md.exe

Maps connected drives based on registry 3 TTPs 2 IoCs

Disk information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	YPeBi8FRoTIc8md.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	YPeBi8FRoTIc8md.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1680 set thread context of 2020	1680	YPeBi8FRoTIc8md.exe	31

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task

T1053

pid	Process
1144	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
1680	YPeBi8FRoTIc8md.exe
1680	YPeBi8FRoTIc8md.exe
1680	YPeBi8FRoTIc8md.exe
2020	YPeBi8FRoTIc8md.exe
2020	YPeBi8FRoTIc8md.exe

Suspicious behavior: RenamesItself 1 IoCs

pid	Process
2020	YPeBi8FRoTIc8md.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1680	YPeBi8FRoTIc8md.exe
Token: SeDebugPrivilege	2020	YPeBi8FRoTIc8md.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2020	YPeBi8FRoTIc8md.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 1680 wrote to memory of 1144	1680	YPeBi8FRoTIc8md.exe	29
PID 1680 wrote to memory of 1144	1680	YPeBi8FRoTIc8md.exe	29
PID 1680 wrote to memory of 1144	1680	YPeBi8FRoTIc8md.exe	29
PID 1680 wrote to memory of 1144	1680	YPeBi8FRoTIc8md.exe	29
PID 1680 wrote to memory of 2020	1680	YPeBi8FRoTIc8md.exe	31
PID 1680 wrote to memory of 2020	1680	YPeBi8FRoTIc8md.exe	31
PID 1680 wrote to memory of 2020	1680	YPeBi8FRoTIc8md.exe	31
PID 1680 wrote to memory of 2020	1680	YPeBi8FRoTIc8md.exe	31
PID 1680 wrote to memory of 2020	1680	YPeBi8FRoTIc8md.exe	31
PID 1680 wrote to memory of 2020	1680	YPeBi8FRoTIc8md.exe	31
PID 1680 wrote to memory of 2020	1680	YPeBi8FRoTIc8md.exe	31
PID 1680 wrote to memory of 2020	1680	YPeBi8FRoTIc8md.exe	31
PID 1680 wrote to memory of 2020	1680	YPeBi8FRoTIc8md.exe	31

C:\Users\Admin\AppData\Local\Temp\YPeBi8FRoTIc8md.exe
"C:\Users\Admin\AppData\Local\Temp\YPeBi8FRoTIc8md.exe"
1⤵
- Checks BIOS information in registry
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1680
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\KKglLIkyG" /XML "C:\Users\Admin\AppData\Local\Temp\tmp8852.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:1144
- C:\Users\Admin\AppData\Local\Temp\YPeBi8FRoTIc8md.exe
  "{path}"
  2⤵
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: RenamesItself
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  PID:2020