agenttesla | 2c8da0da6cbab2366291deabbb773bec304a9e49c87982a04d6ee33c712cd642

General

Target
efott.txt.exe
Size 723KB
Sample200828-4e1ss68evj
SHA256 2c8da0da6cbab2366291deabbb773bec304a9e49c87982a04d6ee33c712cd642
MD5 7b52b5e065c12431e0fabe8c205dc6c5
SHA1 effb71e8fd0c96744b65360450174bc104ab2b67
SHA512 ad89c9581901bf81fd960f68551ab87abf5677c9e612b264d8f13566127f9293a849a1a2662d0b21556ef05fbdade76df2aee604b9e47a6bc4c2073dac88541d
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
@Mexico1.,

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/1028-8-0x0000000000400000-0x0000000000466000-memory.dmp	family_agenttesla
behavioral1/memory/1028-9-0x0000000000460B6E-mapping.dmp	family_agenttesla
behavioral1/memory/1028-10-0x0000000000400000-0x0000000000466000-memory.dmp	family_agenttesla
behavioral1/memory/1028-11-0x0000000000400000-0x0000000000466000-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	efott.txt.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	efott.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	efott.txt.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	efott.txt.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 388 set thread context of 1028	388	efott.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
376	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
388	efott.txt.exe
388	efott.txt.exe
1028	RegSvcs.exe
1028	RegSvcs.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	388	efott.txt.exe
Token: SeDebugPrivilege	1028	RegSvcs.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1028	RegSvcs.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 388 wrote to memory of 376	388	efott.txt.exe	29
PID 388 wrote to memory of 376	388	efott.txt.exe	29
PID 388 wrote to memory of 376	388	efott.txt.exe	29
PID 388 wrote to memory of 376	388	efott.txt.exe	29
PID 388 wrote to memory of 1028	388	efott.txt.exe	31
PID 388 wrote to memory of 1028	388	efott.txt.exe	31
PID 388 wrote to memory of 1028	388	efott.txt.exe	31
PID 388 wrote to memory of 1028	388	efott.txt.exe	31
PID 388 wrote to memory of 1028	388	efott.txt.exe	31
PID 388 wrote to memory of 1028	388	efott.txt.exe	31
PID 388 wrote to memory of 1028	388	efott.txt.exe	31
PID 388 wrote to memory of 1028	388	efott.txt.exe	31
PID 388 wrote to memory of 1028	388	efott.txt.exe	31
PID 388 wrote to memory of 1028	388	efott.txt.exe	31
PID 388 wrote to memory of 1028	388	efott.txt.exe	31
PID 388 wrote to memory of 1028	388	efott.txt.exe	31

C:\Users\Admin\AppData\Local\Temp\efott.txt.exe
"C:\Users\Admin\AppData\Local\Temp\efott.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:388
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\gffuUAfR" /XML "C:\Users\Admin\AppData\Local\Temp\tmp6690.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:376
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
  "{path}"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  PID:1028