stealc | 872c643e80d78523297c4670a7c081bf524de755787ca042dd93b4db9d77db18

General

Target

sample.exe
Size

1.8MB
MD5

24f5d47762308c43e34ad9f93a4c3811
SHA1

1756b29d4dc4fba7d0d19347cf6cf549f250e375
SHA256

872c643e80d78523297c4670a7c081bf524de755787ca042dd93b4db9d77db18
SHA512

de8016609c78890af57349dcf58f5c71758f20664bdcc5f789b1d992df9924e48832324950210c44d6d9485fc1f92f99ada2d53aa5cd6386c4e9ef7053543844
SSDEEP

24576:hUOWUMzMMgW1MWsuYl3MDLmYW9Kz4aDwnxruPHHk9EUxjCgAjH9aHfM2OuM3WQRa:hUfUmfgWTYl2xWs8vuPnkNxrIm3SBjN

Score

10^/10

stealc brat defense_evasion discovery stealer

Malware Config

Extracted

Family

stealc

Botnet

brat

C2

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

defense_evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	sample.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	sample.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	sample.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.

defense_evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000\Software\Wine	sample.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
1588	sample.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2636	1588	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	sample.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	sample.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	sample.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1588	sample.exe
1588	sample.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1588 wrote to memory of 2636	1588	sample.exe	32
PID 1588 wrote to memory of 2636	1588	sample.exe	32
PID 1588 wrote to memory of 2636	1588	sample.exe	32
PID 1588 wrote to memory of 2636	1588	sample.exe	32

C:\Users\Admin\AppData\Local\Temp\sample.exe
"C:\Users\Admin\AppData\Local\Temp\sample.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:1588
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1588 -s 928
  2⤵
  - Program crash
  PID:2636

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

2

T1497

Credential Access

Discovery

Query Registry

5

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Virtualization/Sandbox Evasion

2

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/1588-0-0x0000000000FB0000-0x0000000001673000-memory.dmp

Filesize
6.8MB

Download
memory/1588-1-0x0000000077C30000-0x0000000077C32000-memory.dmp

Filesize
8KB

Download
memory/1588-2-0x0000000000FB1000-0x0000000000FC8000-memory.dmp

Filesize
92KB

Download
memory/1588-3-0x0000000000FB0000-0x0000000001673000-memory.dmp

Filesize
6.8MB

Download
memory/1588-4-0x0000000000FB0000-0x0000000001673000-memory.dmp

Filesize
6.8MB

Download
memory/1588-5-0x0000000000FB0000-0x0000000001673000-memory.dmp

Filesize
6.8MB

Download
memory/1588-6-0x0000000000FB0000-0x0000000001673000-memory.dmp

Filesize
6.8MB

Download
memory/1588-7-0x0000000000FB0000-0x0000000001673000-memory.dmp

Filesize
6.8MB

Download
memory/1588-8-0x0000000000FB0000-0x0000000001673000-memory.dmp

Filesize
6.8MB

Download
memory/1588-9-0x0000000000FB0000-0x0000000001673000-memory.dmp

Filesize
6.8MB

Download
memory/1588-10-0x0000000000FB0000-0x0000000001673000-memory.dmp

Filesize
6.8MB

Download
memory/1588-15-0x0000000000FB0000-0x0000000001673000-memory.dmp

Filesize
6.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads