agenttesla | fb81bca0be85814942a2d54565aa2e734ead67e801d9f41af84cdde043b5c135

General

Target
eustaquio.exe
Size 729KB
Sample220129-thc6padbhl
SHA256 fb81bca0be85814942a2d54565aa2e734ead67e801d9f41af84cdde043b5c135
MD5 b1d28ebe16a2184ab940ab7e201c03e2
SHA1 6638083bf3ee4317323d144009d156198019a408
SHA512 e3159e86ba9a52f0d296c3bc915889a0e8b2b3c5cc3f9aa72a32648f34e10edf4707ac346d1bf5991de6192aa2d8d065fe8d994dc885f2fa9ea73f419cbbe0a7
MD5 SHA1 SHA512

Score

10^/10

agenttesla evasion keylogger persistence spyware stealer trojan

Malware Config

Extracted

Family

agenttesla

Credentials

Protocol
smtp
Host
mail.ashokyadav.co.in
Port
587
Username
[email protected]
Password
imports@123

Signatures

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

AgentTesla Payload 4 IoCs

resource	yara_rule
behavioral1/memory/1188-63-0x0000000000400000-0x000000000043C000-memory.dmp	family_agenttesla
behavioral1/memory/1188-64-0x0000000000400000-0x000000000043C000-memory.dmp	family_agenttesla
behavioral1/memory/1188-65-0x0000000000400000-0x000000000043C000-memory.dmp	family_agenttesla
behavioral1/memory/1188-66-0x0000000000400000-0x000000000043C000-memory.dmp	family_agenttesla

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	eustaquio.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	eustaquio.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-1-5-21-3846991908-3261386348-1409841751-1000\Software\Microsoft\Windows\CurrentVersion\Run\mFXPXyJ = "C:\\Users\\Admin\\AppData\\Roaming\\mFXPXyJ\\mFXPXyJ.exe"	eustaquio.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 value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	eustaquio.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	eustaquio.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1848 set thread context of 1188	1848	eustaquio.exe	32

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

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
1512	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
1848	eustaquio.exe
1188	eustaquio.exe
1188	eustaquio.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1848	eustaquio.exe
Token: SeDebugPrivilege	1188	eustaquio.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 1848 wrote to memory of 1512	1848	eustaquio.exe	30
PID 1848 wrote to memory of 1512	1848	eustaquio.exe	30
PID 1848 wrote to memory of 1512	1848	eustaquio.exe	30
PID 1848 wrote to memory of 1512	1848	eustaquio.exe	30
PID 1848 wrote to memory of 1188	1848	eustaquio.exe	32
PID 1848 wrote to memory of 1188	1848	eustaquio.exe	32
PID 1848 wrote to memory of 1188	1848	eustaquio.exe	32
PID 1848 wrote to memory of 1188	1848	eustaquio.exe	32
PID 1848 wrote to memory of 1188	1848	eustaquio.exe	32
PID 1848 wrote to memory of 1188	1848	eustaquio.exe	32
PID 1848 wrote to memory of 1188	1848	eustaquio.exe	32
PID 1848 wrote to memory of 1188	1848	eustaquio.exe	32
PID 1848 wrote to memory of 1188	1848	eustaquio.exe	32

C:\Users\Admin\AppData\Local\Temp\eustaquio.exe
"C:\Users\Admin\AppData\Local\Temp\eustaquio.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:1848
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\rieDWwmRfzyx" /XML "C:\Users\Admin\AppData\Local\Temp\tmp366C.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:1512
- C:\Users\Admin\AppData\Local\Temp\eustaquio.exe
  "{path}"
  2⤵
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1188