stealc | b3dfb40fa19b4a19759bd60766049c27161b4223ea06380e15be7b0f057cb5bb

General

Target

b3dfb40fa19b4a19759bd60766049c27161b4223ea06380e15be7b0f057cb5bb.exe
Size

5.0MB
MD5

8c40bb6c3c0e8a36f2eae8a4c847bb88
SHA1

540209d851c92683c093101dd2bf73b0f4c63373
SHA256

b3dfb40fa19b4a19759bd60766049c27161b4223ea06380e15be7b0f057cb5bb
SHA512

3a2ef6aa88c5f57d4540ba218d3e30ebfad8d413aae09b79fc69c75f860664a7cce4c046ebac8cd662472801ca2b1300c5f3004670b671261d125b2d502f4d93
SSDEEP

49152:/U5J1Yunor5IBvWZp0s+VRIwM5amXsno+ZrhH4jibjC:/U5w+oryBeZp0s+VRIwM4LoSp4ijC

Score

10^/10

stealc stok discovery evasion stealer

Malware Config

Extracted

Family

stealc

Botnet

stok

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

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	b3dfb40fa19b4a19759bd60766049c27161b4223ea06380e15be7b0f057cb5bb.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	b3dfb40fa19b4a19759bd60766049c27161b4223ea06380e15be7b0f057cb5bb.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	b3dfb40fa19b4a19759bd60766049c27161b4223ea06380e15be7b0f057cb5bb.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-1-5-21-1846800975-3917212583-2893086201-1000\Software\Wine	b3dfb40fa19b4a19759bd60766049c27161b4223ea06380e15be7b0f057cb5bb.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
2404	b3dfb40fa19b4a19759bd60766049c27161b4223ea06380e15be7b0f057cb5bb.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1856	2404	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	b3dfb40fa19b4a19759bd60766049c27161b4223ea06380e15be7b0f057cb5bb.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	b3dfb40fa19b4a19759bd60766049c27161b4223ea06380e15be7b0f057cb5bb.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	b3dfb40fa19b4a19759bd60766049c27161b4223ea06380e15be7b0f057cb5bb.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2404	b3dfb40fa19b4a19759bd60766049c27161b4223ea06380e15be7b0f057cb5bb.exe
2404	b3dfb40fa19b4a19759bd60766049c27161b4223ea06380e15be7b0f057cb5bb.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2404 wrote to memory of 1856	2404	b3dfb40fa19b4a19759bd60766049c27161b4223ea06380e15be7b0f057cb5bb.exe	32
PID 2404 wrote to memory of 1856	2404	b3dfb40fa19b4a19759bd60766049c27161b4223ea06380e15be7b0f057cb5bb.exe	32
PID 2404 wrote to memory of 1856	2404	b3dfb40fa19b4a19759bd60766049c27161b4223ea06380e15be7b0f057cb5bb.exe	32
PID 2404 wrote to memory of 1856	2404	b3dfb40fa19b4a19759bd60766049c27161b4223ea06380e15be7b0f057cb5bb.exe	32

C:\Users\Admin\AppData\Local\Temp\b3dfb40fa19b4a19759bd60766049c27161b4223ea06380e15be7b0f057cb5bb.exe
"C:\Users\Admin\AppData\Local\Temp\b3dfb40fa19b4a19759bd60766049c27161b4223ea06380e15be7b0f057cb5bb.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:2404
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2404 -s 924
  2⤵
  - Program crash
  PID:1856

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/2404-0-0x00000000008F0000-0x0000000000DF2000-memory.dmp

Filesize
5.0MB

Download
memory/2404-1-0x00000000777E0000-0x00000000777E2000-memory.dmp

Filesize
8KB

Download
memory/2404-2-0x00000000008F1000-0x0000000000B3A000-memory.dmp

Filesize
2.3MB

Download
memory/2404-3-0x00000000008F0000-0x0000000000DF2000-memory.dmp

Filesize
5.0MB

Download
memory/2404-4-0x00000000008F0000-0x0000000000DF2000-memory.dmp

Filesize
5.0MB

Download
memory/2404-5-0x00000000008F1000-0x0000000000B3A000-memory.dmp

Filesize
2.3MB

Download
memory/2404-6-0x00000000008F0000-0x0000000000DF2000-memory.dmp

Filesize
5.0MB

Download
memory/2404-7-0x00000000008F0000-0x0000000000DF2000-memory.dmp

Filesize
5.0MB

Download
memory/2404-8-0x00000000008F0000-0x0000000000DF2000-memory.dmp

Filesize
5.0MB

Download
memory/2404-9-0x00000000008F0000-0x0000000000DF2000-memory.dmp

Filesize
5.0MB

Download
memory/2404-10-0x00000000008F0000-0x0000000000DF2000-memory.dmp

Filesize
5.0MB

Download
memory/2404-11-0x00000000008F0000-0x0000000000DF2000-memory.dmp

Filesize
5.0MB

Download
memory/2404-12-0x00000000008F0000-0x0000000000DF2000-memory.dmp

Filesize
5.0MB

Download
memory/2404-13-0x00000000008F1000-0x0000000000B3A000-memory.dmp

Filesize
2.3MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads