agenttesla | cd995254d59965755cb01e59fd244abcf2df29c0979de0e31789879fc2a495e8

General

Target

Letter.exe
Size

581KB
MD5

6b1a709c8884accc0ba410ef9413a04c
SHA1

bb80dad1518cd8d7bb912b74bcf01c927b45394a
SHA256

439ed702b9700b4bd7ec8877db8d90820176cd183cb888c8be9b14267d3581cc
SHA512

309ef31c93845a36060bd4b69a3d7cfc79bebb518530371846165a49c7dc74069777c09067d3406ee2cb3de94494c8ff31b8ffdeb54f0cd4c6088b6cd6fc16c7

Score

10^/10

agenttesla evasion keylogger spyware stealer trojan

Malware Config

Extracted

Family

agenttesla

Credentials

Protocol: smtp
Host:
mail.gayaceramic.com
Port:
587
Username:
[email protected]
Password:
2019gaya

Signatures

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

AgentTesla Payload 6 IoCs

Processes:

resource	yara_rule
behavioral1/memory/524-64-0x0000000000400000-0x000000000045A000-memory.dmp	family_agenttesla
behavioral1/memory/524-65-0x0000000000400000-0x000000000045A000-memory.dmp	family_agenttesla
behavioral1/memory/524-67-0x000000000045437E-mapping.dmp	family_agenttesla
behavioral1/memory/524-66-0x0000000000400000-0x000000000045A000-memory.dmp	family_agenttesla
behavioral1/memory/524-69-0x0000000000400000-0x000000000045A000-memory.dmp	family_agenttesla
behavioral1/memory/524-71-0x0000000000400000-0x000000000045A000-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

Processes:

Letter.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	Letter.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	Letter.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

Processes:

Letter.exe

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

Suspicious use of SetThreadContext 1 IoCs

Processes:

Letter.exe

description pid process target process

PID 1684 set thread context of 524 1684 Letter.exe Letter.exe
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

Processes:

schtasks.exe

pid process

696 schtasks.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

Letter.exe

pid process

524 Letter.exe
524 Letter.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

Letter.exe

description pid process

Token: SeDebugPrivilege 524 Letter.exe

description	pid	process	target process
PID 1684 set thread context of 524	1684	Letter.exe	Letter.exe

pid	process
696	schtasks.exe

pid	process
524	Letter.exe
524	Letter.exe

description	pid	process
Token: SeDebugPrivilege	524	Letter.exe

Suspicious use of WriteProcessMemory 13 IoCs

Processes:

Letter.exe

description	pid	process	target process
PID 1684 wrote to memory of 696	1684	Letter.exe	schtasks.exe
PID 1684 wrote to memory of 696	1684	Letter.exe	schtasks.exe
PID 1684 wrote to memory of 696	1684	Letter.exe	schtasks.exe
PID 1684 wrote to memory of 696	1684	Letter.exe	schtasks.exe
PID 1684 wrote to memory of 524	1684	Letter.exe	Letter.exe
PID 1684 wrote to memory of 524	1684	Letter.exe	Letter.exe
PID 1684 wrote to memory of 524	1684	Letter.exe	Letter.exe
PID 1684 wrote to memory of 524	1684	Letter.exe	Letter.exe
PID 1684 wrote to memory of 524	1684	Letter.exe	Letter.exe
PID 1684 wrote to memory of 524	1684	Letter.exe	Letter.exe
PID 1684 wrote to memory of 524	1684	Letter.exe	Letter.exe
PID 1684 wrote to memory of 524	1684	Letter.exe	Letter.exe
PID 1684 wrote to memory of 524	1684	Letter.exe	Letter.exe

C:\Users\Admin\AppData\Local\Temp\Letter.exe
"C:\Users\Admin\AppData\Local\Temp\Letter.exe"
1⤵
- Checks BIOS information in registry
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1684

C:\Windows\SysWOW64\schtasks.exe
"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\hWFpUZAPSDgj" /XML "C:\Users\Admin\AppData\Local\Temp\tmp1305.tmp"
2⤵
- Creates scheduled task(s)
PID:696

C:\Users\Admin\AppData\Local\Temp\Letter.exe
"C:\Users\Admin\AppData\Local\Temp\Letter.exe"
2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:524

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Virtualization/Sandbox Evasion

2

T1497

Credential Access

Discovery

Query Registry

4

T1012

Virtualization/Sandbox Evasion

2

T1497

System Information Discovery

3

T1082

Peripheral Device Discovery

1

T1120

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp1305.tmp
Filesize
1KB

MD5
e3d48bbe48f978fc920c804fe86905cf

SHA1
a875d61bea048bfe55c807491521f7cafc6b1254

SHA256
b82f9d5c062534910afaa6490e9ad3631119058e4a6a755f6b90ae5b20fab31f

SHA512
a8b8841346d5a980b5452f8e8d5588eb207dac6408ebd384dd44b037e785bcbc5488aa8b0731557955ecc7303565b1e74c9a902d62d41fab220b982d33ab10c4

Download Submit
memory/524-64-0x0000000000400000-0x000000000045A000-memory.dmp

Filesize
360KB

Download
memory/524-67-0x000000000045437E-mapping.dmp

Download
memory/524-71-0x0000000000400000-0x000000000045A000-memory.dmp

Filesize
360KB

Download
memory/524-69-0x0000000000400000-0x000000000045A000-memory.dmp

Filesize
360KB

Download
memory/524-66-0x0000000000400000-0x000000000045A000-memory.dmp

Filesize
360KB

Download
memory/524-65-0x0000000000400000-0x000000000045A000-memory.dmp

Filesize
360KB

Download
memory/524-61-0x0000000000400000-0x000000000045A000-memory.dmp

Filesize
360KB

Download
memory/524-62-0x0000000000400000-0x000000000045A000-memory.dmp

Filesize
360KB

Download
memory/696-59-0x0000000000000000-mapping.dmp

Download
memory/1684-54-0x0000000000DF0000-0x0000000000E88000-memory.dmp

Filesize
608KB

Download
memory/1684-55-0x0000000075761000-0x0000000075763000-memory.dmp

Filesize
8KB

Download
memory/1684-56-0x0000000000630000-0x0000000000642000-memory.dmp

Filesize
72KB

Download
memory/1684-58-0x00000000080F0000-0x000000000814A000-memory.dmp

Filesize
360KB

Download
memory/1684-57-0x0000000007F50000-0x0000000007FC2000-memory.dmp

Filesize
456KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads