agenttesla | a0dee72c5357c474929e083d2205d18b00fedb479ba4fba32fffc91c3d32c6b9

Analysis

max time kernel
67s
max time network
49s
platform
windows10-2004_x64
resource
win10v2004-20240419-en
resource tags

arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system
submitted
30-04-2024 00:46

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General

Target

REXObfuscator.exe
Size

4.9MB
MD5

c80af0de7960d66227c20901ad220feb
SHA1

83fe8468210035bbb2c24b50645a11e62fb377bd
SHA256

a0dee72c5357c474929e083d2205d18b00fedb479ba4fba32fffc91c3d32c6b9
SHA512

f34e1a276cd3db5676e5d6ef92343f1d456c72e93024cf9bde817bf6a3ae0aa9f903123b3796862fa28e1e8cbcf1271bb77f96ac4f699a79ddab1134fb924f13
SSDEEP

98304:Fz/2M3gz6lUcoD83VAZGtqEnQcvytg1ucK3t:V/2M3/lfXlAZXEnQcaeucK3t

Score

10^/10

agenttesla evasion keylogger spyware stealer trojan

Malware Config

Signatures

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

AgentTesla payload 1 IoCs

Processes:

resource	yara_rule
behavioral1/memory/1696-8-0x0000000006C50000-0x0000000006E62000-memory.dmp	family_agenttesla

Looks for VirtualBox Guest Additions in registry 2 TTPs 1 IoCs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Processes:

REXObfuscator.exe

description ioc process

Key opened \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Oracle\VirtualBox Guest Additions REXObfuscator.exe
Looks for VMWare Tools registry key 2 TTPs 1 IoCs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Processes:

REXObfuscator.exe

description ioc process

Key opened \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\VMware, Inc.\VMware Tools REXObfuscator.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Oracle\VirtualBox Guest Additions	REXObfuscator.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\VMware, Inc.\VMware Tools	REXObfuscator.exe

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:

REXObfuscator.exe

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

REXObfuscator.exe

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

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

Processes:

REXObfuscator.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemManufacturer	REXObfuscator.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemVersion	REXObfuscator.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS	REXObfuscator.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

Processes:

REXObfuscator.exe

pid	process
1696	REXObfuscator.exe
1696	REXObfuscator.exe
1696	REXObfuscator.exe
1696	REXObfuscator.exe
1696	REXObfuscator.exe
1696	REXObfuscator.exe
1696	REXObfuscator.exe
1696	REXObfuscator.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

REXObfuscator.exe

description pid process

Token: SeDebugPrivilege 1696 REXObfuscator.exe

description	pid	process
Token: SeDebugPrivilege	1696	REXObfuscator.exe

C:\Users\Admin\AppData\Local\Temp\REXObfuscator.exe
"C:\Users\Admin\AppData\Local\Temp\REXObfuscator.exe"
1⤵
- Looks for VirtualBox Guest Additions in registry
- Looks for VMWare Tools registry key
- Checks BIOS information in registry
- Maps connected drives based on registry
- Enumerates system info in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1696

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1696-0-0x00000000004A0000-0x000000000099E000-memory.dmp

Filesize
5.0MB

Download
memory/1696-1-0x0000000075220000-0x00000000759D0000-memory.dmp

Filesize
7.7MB

Download
memory/1696-2-0x00000000054C0000-0x00000000054D0000-memory.dmp

Filesize
64KB

Download
memory/1696-3-0x00000000054D0000-0x0000000005892000-memory.dmp

Filesize
3.8MB

Download
memory/1696-4-0x0000000005E40000-0x00000000063E4000-memory.dmp

Filesize
5.6MB

Download
memory/1696-5-0x0000000005930000-0x00000000059C2000-memory.dmp

Filesize
584KB

Download
memory/1696-6-0x0000000005B40000-0x0000000005BA6000-memory.dmp

Filesize
408KB

Download
memory/1696-7-0x00000000064A0000-0x00000000064AA000-memory.dmp

Filesize
40KB

Download
memory/1696-8-0x0000000006C50000-0x0000000006E62000-memory.dmp

Filesize
2.1MB

Download
memory/1696-9-0x00000000054C0000-0x00000000054D0000-memory.dmp

Filesize
64KB

Download
memory/1696-10-0x0000000007D20000-0x0000000007D32000-memory.dmp

Filesize
72KB

Download
memory/1696-11-0x00000000080A0000-0x0000000008152000-memory.dmp

Filesize
712KB

Download
memory/1696-12-0x0000000075220000-0x00000000759D0000-memory.dmp

Filesize
7.7MB

Download
memory/1696-13-0x00000000054C0000-0x00000000054D0000-memory.dmp

Filesize
64KB

Download
memory/1696-15-0x0000000075220000-0x00000000759D0000-memory.dmp

Filesize
7.7MB

Download