agenttesla | 7d47f11a565adc0b68333cdc0a70dfc6748a200c2a85bdada22d4c23545dcb56

General

Target
dek.txt.exe
Size 677KB
Sample200828-ec4dd2g2l2
SHA256 7d47f11a565adc0b68333cdc0a70dfc6748a200c2a85bdada22d4c23545dcb56
MD5 062dc73ac4a7babfe4acfd2de9a5e781
SHA1 9b118d2837442ee3ebb52af8262e8eb84f41fede
SHA512 d0fa73c9a93957856dcc0ff4ef7cc64d6d9171d833a7bcc2f82d26423bae8cfd5c59682725eae3a7c9e35cc1f9d8d8ce011e93e1626a1dd3752eeaf20ce65d40
MD5 SHA1 SHA512

Score

10^/10

agenttesla evasion keylogger spyware stealer trojan

Malware Config

Extracted

Family

agenttesla

Credentials

Protocol
smtp
Host
mail.privateemail.com
Port
587
Username
[email protected]
Password
AugustBlessings@

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/544-8-0x0000000000400000-0x0000000000466000-memory.dmp	family_agenttesla
behavioral1/memory/544-9-0x000000000046113E-mapping.dmp	family_agenttesla
behavioral1/memory/544-10-0x0000000000400000-0x0000000000466000-memory.dmp	family_agenttesla
behavioral1/memory/544-11-0x0000000000400000-0x0000000000466000-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	dek.txt.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	dek.txt.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	dek.txt.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	dek.txt.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1164 set thread context of 544	1164	dek.txt.exe	31

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
1944	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
1164	dek.txt.exe
1164	dek.txt.exe
1164	dek.txt.exe
544	RegSvcs.exe
544	RegSvcs.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1164	dek.txt.exe
Token: SeDebugPrivilege	544	RegSvcs.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
544	RegSvcs.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 1164 wrote to memory of 1944	1164	dek.txt.exe	29
PID 1164 wrote to memory of 1944	1164	dek.txt.exe	29
PID 1164 wrote to memory of 1944	1164	dek.txt.exe	29
PID 1164 wrote to memory of 1944	1164	dek.txt.exe	29
PID 1164 wrote to memory of 544	1164	dek.txt.exe	31
PID 1164 wrote to memory of 544	1164	dek.txt.exe	31
PID 1164 wrote to memory of 544	1164	dek.txt.exe	31
PID 1164 wrote to memory of 544	1164	dek.txt.exe	31
PID 1164 wrote to memory of 544	1164	dek.txt.exe	31
PID 1164 wrote to memory of 544	1164	dek.txt.exe	31
PID 1164 wrote to memory of 544	1164	dek.txt.exe	31
PID 1164 wrote to memory of 544	1164	dek.txt.exe	31
PID 1164 wrote to memory of 544	1164	dek.txt.exe	31
PID 1164 wrote to memory of 544	1164	dek.txt.exe	31
PID 1164 wrote to memory of 544	1164	dek.txt.exe	31
PID 1164 wrote to memory of 544	1164	dek.txt.exe	31

C:\Users\Admin\AppData\Local\Temp\dek.txt.exe
"C:\Users\Admin\AppData\Local\Temp\dek.txt.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:1164
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\lXyKhhUV" /XML "C:\Users\Admin\AppData\Local\Temp\tmp30FF.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:1944
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
  "{path}"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  PID:544