stealc | b44255c5f4ee75738a2d023a3d28e4ba739428da9c54bf32b4060ee0bc54ec2b

General

Target

b44255c5f4ee75738a2d023a3d28e4ba739428da9c54bf32b4060ee0bc54ec2bN.exe
Size

1.7MB
MD5

2dfb8158238eaea77e018d655ddb93f0
SHA1

63ed6e5e5837c8eb8ec81ae7facefcc086d55b48
SHA256

b44255c5f4ee75738a2d023a3d28e4ba739428da9c54bf32b4060ee0bc54ec2b
SHA512

5cf7c8ed3d5f5108172e8cdabd1940b2282d92cb5c05f748f251b332bcd26ba55fb747c8874715230d605ad77b5e1077371d5ee0a9e09e61f4aebabcbc0b550d
SSDEEP

49152:lT4NrRZIzAF6ld8hpXIXwpeqpm0xq2guKeoM/:NUrAkF6lGnX+AHxqPe

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__	b44255c5f4ee75738a2d023a3d28e4ba739428da9c54bf32b4060ee0bc54ec2bN.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	b44255c5f4ee75738a2d023a3d28e4ba739428da9c54bf32b4060ee0bc54ec2bN.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	b44255c5f4ee75738a2d023a3d28e4ba739428da9c54bf32b4060ee0bc54ec2bN.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-1-5-21-312935884-697965778-3955649944-1000\Software\Wine	b44255c5f4ee75738a2d023a3d28e4ba739428da9c54bf32b4060ee0bc54ec2bN.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
2084	b44255c5f4ee75738a2d023a3d28e4ba739428da9c54bf32b4060ee0bc54ec2bN.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2604	2084	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	b44255c5f4ee75738a2d023a3d28e4ba739428da9c54bf32b4060ee0bc54ec2bN.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	b44255c5f4ee75738a2d023a3d28e4ba739428da9c54bf32b4060ee0bc54ec2bN.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	b44255c5f4ee75738a2d023a3d28e4ba739428da9c54bf32b4060ee0bc54ec2bN.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2084	b44255c5f4ee75738a2d023a3d28e4ba739428da9c54bf32b4060ee0bc54ec2bN.exe
2084	b44255c5f4ee75738a2d023a3d28e4ba739428da9c54bf32b4060ee0bc54ec2bN.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2084 wrote to memory of 2604	2084	b44255c5f4ee75738a2d023a3d28e4ba739428da9c54bf32b4060ee0bc54ec2bN.exe	32
PID 2084 wrote to memory of 2604	2084	b44255c5f4ee75738a2d023a3d28e4ba739428da9c54bf32b4060ee0bc54ec2bN.exe	32
PID 2084 wrote to memory of 2604	2084	b44255c5f4ee75738a2d023a3d28e4ba739428da9c54bf32b4060ee0bc54ec2bN.exe	32
PID 2084 wrote to memory of 2604	2084	b44255c5f4ee75738a2d023a3d28e4ba739428da9c54bf32b4060ee0bc54ec2bN.exe	32

C:\Users\Admin\AppData\Local\Temp\b44255c5f4ee75738a2d023a3d28e4ba739428da9c54bf32b4060ee0bc54ec2bN.exe
"C:\Users\Admin\AppData\Local\Temp\b44255c5f4ee75738a2d023a3d28e4ba739428da9c54bf32b4060ee0bc54ec2bN.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:2084
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2084 -s 932
  2⤵
  - Program crash
  PID:2604

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/2084-0-0x0000000000BA0000-0x000000000121A000-memory.dmp

Filesize
6.5MB

Download
memory/2084-1-0x00000000773D0000-0x00000000773D2000-memory.dmp

Filesize
8KB

Download
memory/2084-2-0x0000000000BA1000-0x0000000000BB8000-memory.dmp

Filesize
92KB

Download
memory/2084-3-0x0000000000BA0000-0x000000000121A000-memory.dmp

Filesize
6.5MB

Download
memory/2084-4-0x0000000000BA0000-0x000000000121A000-memory.dmp

Filesize
6.5MB

Download
memory/2084-5-0x0000000000BA0000-0x000000000121A000-memory.dmp

Filesize
6.5MB

Download
memory/2084-6-0x0000000000BA0000-0x000000000121A000-memory.dmp

Filesize
6.5MB

Download
memory/2084-7-0x0000000000BA0000-0x000000000121A000-memory.dmp

Filesize
6.5MB

Download
memory/2084-8-0x0000000000BA0000-0x000000000121A000-memory.dmp

Filesize
6.5MB

Download
memory/2084-9-0x0000000000BA0000-0x000000000121A000-memory.dmp

Filesize
6.5MB

Download
memory/2084-10-0x0000000000BA0000-0x000000000121A000-memory.dmp

Filesize
6.5MB

Download
memory/2084-11-0x0000000000BA0000-0x000000000121A000-memory.dmp

Filesize
6.5MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads