stealc | 55cfd403887d49db21b5f57811385ee6aad3cb227dffa94a09e562e245ec299d

General

Target

55cfd403887d49db21b5f57811385ee6aad3cb227dffa94a09e562e245ec299d.exe
Size

1.7MB
MD5

7556cfc61d6c9b652ab946e86254b8b9
SHA1

a73c8c885d2b10be4b534b2f79a46665b421d0ac
SHA256

55cfd403887d49db21b5f57811385ee6aad3cb227dffa94a09e562e245ec299d
SHA512

cf16e89abb9f0ffba94dc5c203847cae4f2189c7a52fa1b0f20ab06819a401ba9105b2aaed6025677453da092b0fd14253ad34fa469a762f12a6f0c07dfe226f
SSDEEP

49152:5CmW42RvTUmuSbrvXCGFU38UYFQeUtfZeW:5CmWTRvTUmRHvXCmg8rLWMW

Score

10^/10

stealc brat discovery evasion 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

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	55cfd403887d49db21b5f57811385ee6aad3cb227dffa94a09e562e245ec299d.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	55cfd403887d49db21b5f57811385ee6aad3cb227dffa94a09e562e245ec299d.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	55cfd403887d49db21b5f57811385ee6aad3cb227dffa94a09e562e245ec299d.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	55cfd403887d49db21b5f57811385ee6aad3cb227dffa94a09e562e245ec299d.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
2420	55cfd403887d49db21b5f57811385ee6aad3cb227dffa94a09e562e245ec299d.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2552	2420	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	55cfd403887d49db21b5f57811385ee6aad3cb227dffa94a09e562e245ec299d.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 value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	55cfd403887d49db21b5f57811385ee6aad3cb227dffa94a09e562e245ec299d.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	55cfd403887d49db21b5f57811385ee6aad3cb227dffa94a09e562e245ec299d.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2420	55cfd403887d49db21b5f57811385ee6aad3cb227dffa94a09e562e245ec299d.exe
2420	55cfd403887d49db21b5f57811385ee6aad3cb227dffa94a09e562e245ec299d.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2420 wrote to memory of 2552	2420	55cfd403887d49db21b5f57811385ee6aad3cb227dffa94a09e562e245ec299d.exe	31
PID 2420 wrote to memory of 2552	2420	55cfd403887d49db21b5f57811385ee6aad3cb227dffa94a09e562e245ec299d.exe	31
PID 2420 wrote to memory of 2552	2420	55cfd403887d49db21b5f57811385ee6aad3cb227dffa94a09e562e245ec299d.exe	31
PID 2420 wrote to memory of 2552	2420	55cfd403887d49db21b5f57811385ee6aad3cb227dffa94a09e562e245ec299d.exe	31

C:\Users\Admin\AppData\Local\Temp\55cfd403887d49db21b5f57811385ee6aad3cb227dffa94a09e562e245ec299d.exe
"C:\Users\Admin\AppData\Local\Temp\55cfd403887d49db21b5f57811385ee6aad3cb227dffa94a09e562e245ec299d.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:2420
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2420 -s 928
  2⤵
  - Program crash
  PID:2552

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/2420-0-0x0000000000EF0000-0x0000000001589000-memory.dmp

Filesize
6.6MB

Download
memory/2420-1-0x0000000077370000-0x0000000077372000-memory.dmp

Filesize
8KB

Download
memory/2420-2-0x0000000000EF1000-0x0000000000F08000-memory.dmp

Filesize
92KB

Download
memory/2420-3-0x0000000000EF0000-0x0000000001589000-memory.dmp

Filesize
6.6MB

Download
memory/2420-4-0x0000000000EF0000-0x0000000001589000-memory.dmp

Filesize
6.6MB

Download
memory/2420-5-0x0000000000EF0000-0x0000000001589000-memory.dmp

Filesize
6.6MB

Download
memory/2420-6-0x0000000000EF0000-0x0000000001589000-memory.dmp

Filesize
6.6MB

Download
memory/2420-7-0x0000000000EF0000-0x0000000001589000-memory.dmp

Filesize
6.6MB

Download
memory/2420-8-0x0000000000EF0000-0x0000000001589000-memory.dmp

Filesize
6.6MB

Download
memory/2420-9-0x0000000000EF0000-0x0000000001589000-memory.dmp

Filesize
6.6MB

Download
memory/2420-10-0x0000000000EF0000-0x0000000001589000-memory.dmp

Filesize
6.6MB

Download
memory/2420-11-0x0000000000EF0000-0x0000000001589000-memory.dmp

Filesize
6.6MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads