agenttesla | 5b1b8f25badc68e5ea51912e4d56c879a1a2e9ba3743c87a5c31843bb0ab099f

General

Target
PO 867665#.exe
Size 480KB
Sample201109-54alvsqsp2
SHA256 5b1b8f25badc68e5ea51912e4d56c879a1a2e9ba3743c87a5c31843bb0ab099f
MD5 c42a24e45966ba0b198b8b6bf35c6cc1
SHA1 4af5d0d30c9cbd2a1409453f22f62aeddaab2705
SHA512 79005a949dceef1f1796a42b1ef33451d582fcf6068d8ed17d61dd9a203bab2a1578e348a631513b11452d95830c0b9d3c370a0875564834d4464fc94171c0a5
MD5 SHA1 SHA512

Score

10^/10

agenttesla coreentity evasion keylogger rezer0 spyware stealer trojan

Malware Config

Extracted

Credentials

Protocol
smtp
Host
mail.fakly-cambodia.com
Port
587
Username
[email protected]
Password
Mmhh#2014

Extracted

Family

agenttesla

Credentials

Protocol
smtp
Host
mail.fakly-cambodia.com
Port
587
Username
[email protected]
Password
Mmhh#2014

Signatures

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

CoreEntity .NET Packer 1 IoCs

A .NET packer called CoreEntity where it has embedded the payload as a BitMap object which is later decrypted.

coreentity

resource	yara_rule
behavioral2/memory/912-6-0x0000000004E30000-0x0000000004E33000-memory.dmp	coreentity

AgentTesla Payload 2 IoCs

resource	yara_rule
behavioral2/memory/2620-12-0x0000000000400000-0x0000000000452000-memory.dmp	family_agenttesla
behavioral2/memory/2620-13-0x000000000044CEEE-mapping.dmp	family_agenttesla

Looks for VirtualBox Guest Additions in registry 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

rezer0 1 IoCs

Detects ReZer0, a packer with multiple versions used in various campaigns.

rezer0

resource	yara_rule
behavioral2/memory/912-7-0x0000000005930000-0x0000000005983000-memory.dmp	rezer0

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	PO 867665#.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	PO 867665#.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

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	PO 867665#.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum\0	PO 867665#.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 912 set thread context of 2620	912	PO 867665#.exe	78

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
2768	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
912	PO 867665#.exe
912	PO 867665#.exe
912	PO 867665#.exe
2620	PO 867665#.exe
2620	PO 867665#.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	912	PO 867665#.exe
Token: SeDebugPrivilege	2620	PO 867665#.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2620	PO 867665#.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 912 wrote to memory of 2768	912	PO 867665#.exe	75
PID 912 wrote to memory of 2768	912	PO 867665#.exe	75
PID 912 wrote to memory of 2768	912	PO 867665#.exe	75
PID 912 wrote to memory of 3332	912	PO 867665#.exe	77
PID 912 wrote to memory of 3332	912	PO 867665#.exe	77
PID 912 wrote to memory of 3332	912	PO 867665#.exe	77
PID 912 wrote to memory of 2620	912	PO 867665#.exe	78
PID 912 wrote to memory of 2620	912	PO 867665#.exe	78
PID 912 wrote to memory of 2620	912	PO 867665#.exe	78
PID 912 wrote to memory of 2620	912	PO 867665#.exe	78
PID 912 wrote to memory of 2620	912	PO 867665#.exe	78
PID 912 wrote to memory of 2620	912	PO 867665#.exe	78
PID 912 wrote to memory of 2620	912	PO 867665#.exe	78
PID 912 wrote to memory of 2620	912	PO 867665#.exe	78
PID 2620 wrote to memory of 3168	2620	PO 867665#.exe	82
PID 2620 wrote to memory of 3168	2620	PO 867665#.exe	82
PID 2620 wrote to memory of 3168	2620	PO 867665#.exe	82

C:\Users\Admin\AppData\Local\Temp\PO 867665#.exe
"C:\Users\Admin\AppData\Local\Temp\PO 867665#.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:912
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\IKRiqY" /XML "C:\Users\Admin\AppData\Local\Temp\tmp58F3.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:2768
- C:\Users\Admin\AppData\Local\Temp\PO 867665#.exe
  "{path}"
  2⤵
  PID:3332
- C:\Users\Admin\AppData\Local\Temp\PO 867665#.exe
  "{path}"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2620
- - C:\Windows\SysWOW64\netsh.exe
    "netsh" wlan show profile
    3⤵
    PID:3168