stealc | 9599af00ff7eeb226b07e57f6761559858eda9a768dec345a37d1f59f64aa095

Resubmissions

11/01/2025, 11:17

250111-nd531sxqcv 3

11/01/2025, 11:05

250111-m7bwlaxnbv 10

Analysis

max time kernel
51s
max time network
31s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
11/01/2025, 11:05

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General

Target

9599af00ff7eeb226b07e57f6761559858eda9a768dec345a37d1f59f64aa095N.exe
Size

1.7MB
MD5

1bf934f2f20f8ad6bd44365df231ccf0
SHA1

22c168a1b712c66a865cae62cc049055574084ee
SHA256

9599af00ff7eeb226b07e57f6761559858eda9a768dec345a37d1f59f64aa095
SHA512

84e901e2e76676c7334b7a0ebaa77007fa76f9300acfcf91da902cc27048843262ed2a2598cee6ea05ca8d38e7388c07a24d2aaa81533a9343d2e09ed79367fe
SSDEEP

49152:/oT2tslxfK1iIVawlZtAtsKF4mq+hAIJCqp:/SisXK1i4aUM2KF4mhA+C

Score

10^/10

stealc brat discovery evasion stealer

Malware Config

Extracted

Family

stealc

Botnet

brat

http://185.215.113.206

Attributes

url_path
/c4becf79229cb002.php

Signatures

Stealc
Stealc is an infostealer written in C++.
stealer stealc
Stealc family
stealc

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	9599af00ff7eeb226b07e57f6761559858eda9a768dec345a37d1f59f64aa095N.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

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	9599af00ff7eeb226b07e57f6761559858eda9a768dec345a37d1f59f64aa095N.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	9599af00ff7eeb226b07e57f6761559858eda9a768dec345a37d1f59f64aa095N.exe

Identifies Wine through registry keys 2 TTPs 1 IoCs

Wine is a compatibility layer capable of running Windows applications, which can be used as sandboxing environment.

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000\Software\Wine	9599af00ff7eeb226b07e57f6761559858eda9a768dec345a37d1f59f64aa095N.exe

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
2536	9599af00ff7eeb226b07e57f6761559858eda9a768dec345a37d1f59f64aa095N.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2212	2536	WerFault.exe	29

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	9599af00ff7eeb226b07e57f6761559858eda9a768dec345a37d1f59f64aa095N.exe

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	9599af00ff7eeb226b07e57f6761559858eda9a768dec345a37d1f59f64aa095N.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	9599af00ff7eeb226b07e57f6761559858eda9a768dec345a37d1f59f64aa095N.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2536	9599af00ff7eeb226b07e57f6761559858eda9a768dec345a37d1f59f64aa095N.exe
2536	9599af00ff7eeb226b07e57f6761559858eda9a768dec345a37d1f59f64aa095N.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2536 wrote to memory of 2212	2536	9599af00ff7eeb226b07e57f6761559858eda9a768dec345a37d1f59f64aa095N.exe	32
PID 2536 wrote to memory of 2212	2536	9599af00ff7eeb226b07e57f6761559858eda9a768dec345a37d1f59f64aa095N.exe	32
PID 2536 wrote to memory of 2212	2536	9599af00ff7eeb226b07e57f6761559858eda9a768dec345a37d1f59f64aa095N.exe	32
PID 2536 wrote to memory of 2212	2536	9599af00ff7eeb226b07e57f6761559858eda9a768dec345a37d1f59f64aa095N.exe	32

C:\Users\Admin\AppData\Local\Temp\9599af00ff7eeb226b07e57f6761559858eda9a768dec345a37d1f59f64aa095N.exe
"C:\Users\Admin\AppData\Local\Temp\9599af00ff7eeb226b07e57f6761559858eda9a768dec345a37d1f59f64aa095N.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Identifies Wine through registry keys
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2536
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2536 -s 920
  2⤵
  - Program crash
  PID:2212

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/2536-0-0x0000000000800000-0x0000000000E80000-memory.dmp

Filesize
6.5MB

Download
memory/2536-1-0x0000000076F00000-0x0000000076F02000-memory.dmp

Filesize
8KB

Download
memory/2536-2-0x0000000000801000-0x0000000000818000-memory.dmp

Filesize
92KB

Download
memory/2536-3-0x0000000000800000-0x0000000000E80000-memory.dmp

Filesize
6.5MB

Download
memory/2536-4-0x0000000000800000-0x0000000000E80000-memory.dmp

Filesize
6.5MB

Download
memory/2536-5-0x0000000000800000-0x0000000000E80000-memory.dmp

Filesize
6.5MB

Download
memory/2536-6-0x0000000000800000-0x0000000000E80000-memory.dmp

Filesize
6.5MB

Download
memory/2536-7-0x0000000000800000-0x0000000000E80000-memory.dmp

Filesize
6.5MB

Download
memory/2536-8-0x0000000000800000-0x0000000000E80000-memory.dmp

Filesize
6.5MB

Download
memory/2536-9-0x0000000000800000-0x0000000000E80000-memory.dmp

Filesize
6.5MB

Download
memory/2536-10-0x0000000000800000-0x0000000000E80000-memory.dmp

Filesize
6.5MB

Download
memory/2536-11-0x0000000000800000-0x0000000000E80000-memory.dmp

Filesize
6.5MB

Download